diff options
Diffstat (limited to 'libdde_linux26/contrib/kernel')
| -rw-r--r-- | libdde_linux26/contrib/kernel/dma.c | 161 | ||||
| -rw-r--r-- | libdde_linux26/contrib/kernel/kthread.c | 270 | ||||
| -rw-r--r-- | libdde_linux26/contrib/kernel/mutex.c | 388 | ||||
| -rw-r--r-- | libdde_linux26/contrib/kernel/mutex.h | 30 | ||||
| -rw-r--r-- | libdde_linux26/contrib/kernel/notifier.c | 586 | ||||
| -rw-r--r-- | libdde_linux26/contrib/kernel/rcupdate.c | 189 | ||||
| -rw-r--r-- | libdde_linux26/contrib/kernel/rwsem.c | 148 | ||||
| -rw-r--r-- | libdde_linux26/contrib/kernel/semaphore.c | 263 |
8 files changed, 0 insertions, 2035 deletions
diff --git a/libdde_linux26/contrib/kernel/dma.c b/libdde_linux26/contrib/kernel/dma.c deleted file mode 100644 index f903189c..00000000 --- a/libdde_linux26/contrib/kernel/dma.c +++ /dev/null @@ -1,161 +0,0 @@ -/* - * linux/kernel/dma.c: A DMA channel allocator. Inspired by linux/kernel/irq.c. - * - * Written by Hennus Bergman, 1992. - * - * 1994/12/26: Changes by Alex Nash to fix a minor bug in /proc/dma. - * In the previous version the reported device could end up being wrong, - * if a device requested a DMA channel that was already in use. - * [It also happened to remove the sizeof(char *) == sizeof(int) - * assumption introduced because of those /proc/dma patches. -- Hennus] - */ -#include <linux/module.h> -#include <linux/kernel.h> -#include <linux/errno.h> -#include <linux/spinlock.h> -#include <linux/string.h> -#include <linux/seq_file.h> -#include <linux/proc_fs.h> -#include <linux/init.h> -#include <asm/dma.h> -#include <asm/system.h> - - - -/* A note on resource allocation: - * - * All drivers needing DMA channels, should allocate and release them - * through the public routines `request_dma()' and `free_dma()'. - * - * In order to avoid problems, all processes should allocate resources in - * the same sequence and release them in the reverse order. - * - * So, when allocating DMAs and IRQs, first allocate the IRQ, then the DMA. - * When releasing them, first release the DMA, then release the IRQ. - * If you don't, you may cause allocation requests to fail unnecessarily. - * This doesn't really matter now, but it will once we get real semaphores - * in the kernel. - */ - - -DEFINE_SPINLOCK(dma_spin_lock); - -/* - * If our port doesn't define this it has no PC like DMA - */ - -#ifdef MAX_DMA_CHANNELS - - -/* Channel n is busy iff dma_chan_busy[n].lock != 0. - * DMA0 used to be reserved for DRAM refresh, but apparently not any more... - * DMA4 is reserved for cascading. - */ - -struct dma_chan { - int lock; - const char *device_id; -}; - -static struct dma_chan dma_chan_busy[MAX_DMA_CHANNELS] = { - [4] = { 1, "cascade" }, -}; - - -/** - * request_dma - request and reserve a system DMA channel - * @dmanr: DMA channel number - * @device_id: reserving device ID string, used in /proc/dma - */ -int request_dma(unsigned int dmanr, const char * device_id) -{ - if (dmanr >= MAX_DMA_CHANNELS) - return -EINVAL; - - if (xchg(&dma_chan_busy[dmanr].lock, 1) != 0) - return -EBUSY; - - dma_chan_busy[dmanr].device_id = device_id; - - /* old flag was 0, now contains 1 to indicate busy */ - return 0; -} /* request_dma */ - -/** - * free_dma - free a reserved system DMA channel - * @dmanr: DMA channel number - */ -void free_dma(unsigned int dmanr) -{ - if (dmanr >= MAX_DMA_CHANNELS) { - printk(KERN_WARNING "Trying to free DMA%d\n", dmanr); - return; - } - - if (xchg(&dma_chan_busy[dmanr].lock, 0) == 0) { - printk(KERN_WARNING "Trying to free free DMA%d\n", dmanr); - return; - } - -} /* free_dma */ - -#else - -int request_dma(unsigned int dmanr, const char *device_id) -{ - return -EINVAL; -} - -void free_dma(unsigned int dmanr) -{ -} - -#endif - -#ifdef CONFIG_PROC_FS - -#ifdef MAX_DMA_CHANNELS -static int proc_dma_show(struct seq_file *m, void *v) -{ - int i; - - for (i = 0 ; i < MAX_DMA_CHANNELS ; i++) { - if (dma_chan_busy[i].lock) { - seq_printf(m, "%2d: %s\n", i, - dma_chan_busy[i].device_id); - } - } - return 0; -} -#else -static int proc_dma_show(struct seq_file *m, void *v) -{ - seq_puts(m, "No DMA\n"); - return 0; -} -#endif /* MAX_DMA_CHANNELS */ - -static int proc_dma_open(struct inode *inode, struct file *file) -{ - return single_open(file, proc_dma_show, NULL); -} - -static const struct file_operations proc_dma_operations = { - .open = proc_dma_open, - .read = seq_read, - .llseek = seq_lseek, - .release = single_release, -}; - -static int __init proc_dma_init(void) -{ - proc_create("dma", 0, NULL, &proc_dma_operations); - return 0; -} - -__initcall(proc_dma_init); -#endif - -EXPORT_SYMBOL(request_dma); -EXPORT_SYMBOL(free_dma); -EXPORT_SYMBOL(dma_spin_lock); diff --git a/libdde_linux26/contrib/kernel/kthread.c b/libdde_linux26/contrib/kernel/kthread.c deleted file mode 100644 index 4fbc456f..00000000 --- a/libdde_linux26/contrib/kernel/kthread.c +++ /dev/null @@ -1,270 +0,0 @@ -/* Kernel thread helper functions. - * Copyright (C) 2004 IBM Corporation, Rusty Russell. - * - * Creation is done via kthreadd, so that we get a clean environment - * even if we're invoked from userspace (think modprobe, hotplug cpu, - * etc.). - */ -#include <linux/sched.h> -#include <linux/kthread.h> -#include <linux/completion.h> -#include <linux/err.h> -#include <linux/unistd.h> -#include <linux/file.h> -#include <linux/module.h> -#include <linux/mutex.h> -#include <trace/sched.h> - -#define KTHREAD_NICE_LEVEL (-5) - -static DEFINE_SPINLOCK(kthread_create_lock); -static LIST_HEAD(kthread_create_list); -struct task_struct *kthreadd_task; - -DEFINE_TRACE(sched_kthread_stop); -DEFINE_TRACE(sched_kthread_stop_ret); - -struct kthread_create_info -{ - /* Information passed to kthread() from kthreadd. */ - int (*threadfn)(void *data); - void *data; - struct completion started; - - /* Result passed back to kthread_create() from kthreadd. */ - struct task_struct *result; - struct completion done; - - struct list_head list; -}; - -struct kthread_stop_info -{ - struct task_struct *k; - int err; - struct completion done; -}; - -/* Thread stopping is done by setthing this var: lock serializes - * multiple kthread_stop calls. */ -static DEFINE_MUTEX(kthread_stop_lock); -static struct kthread_stop_info kthread_stop_info; - -/** - * kthread_should_stop - should this kthread return now? - * - * When someone calls kthread_stop() on your kthread, it will be woken - * and this will return true. You should then return, and your return - * value will be passed through to kthread_stop(). - */ -int kthread_should_stop(void) -{ - return (kthread_stop_info.k == current); -} -EXPORT_SYMBOL(kthread_should_stop); - -static int kthread(void *_create) -{ - struct kthread_create_info *create = _create; - int (*threadfn)(void *data); - void *data; - int ret = -EINTR; - - /* Copy data: it's on kthread's stack */ - threadfn = create->threadfn; - data = create->data; - - /* OK, tell user we're spawned, wait for stop or wakeup */ - __set_current_state(TASK_UNINTERRUPTIBLE); - complete(&create->started); - schedule(); - - if (!kthread_should_stop()) - ret = threadfn(data); - - /* It might have exited on its own, w/o kthread_stop. Check. */ - if (kthread_should_stop()) { - kthread_stop_info.err = ret; - complete(&kthread_stop_info.done); - } - return 0; -} - -static void create_kthread(struct kthread_create_info *create) -{ - int pid; - - /* We want our own signal handler (we take no signals by default). */ - pid = kernel_thread(kthread, create, CLONE_FS | CLONE_FILES | SIGCHLD); - if (pid < 0) { - create->result = ERR_PTR(pid); - } else { - struct sched_param param = { .sched_priority = 0 }; - wait_for_completion(&create->started); - read_lock(&tasklist_lock); - create->result = find_task_by_pid_ns(pid, &init_pid_ns); - read_unlock(&tasklist_lock); - /* - * root may have changed our (kthreadd's) priority or CPU mask. - * The kernel thread should not inherit these properties. - */ - sched_setscheduler(create->result, SCHED_NORMAL, ¶m); - set_user_nice(create->result, KTHREAD_NICE_LEVEL); - set_cpus_allowed_ptr(create->result, CPU_MASK_ALL_PTR); - } - complete(&create->done); -} - -/** - * kthread_create - create a kthread. - * @threadfn: the function to run until signal_pending(current). - * @data: data ptr for @threadfn. - * @namefmt: printf-style name for the thread. - * - * Description: This helper function creates and names a kernel - * thread. The thread will be stopped: use wake_up_process() to start - * it. See also kthread_run(), kthread_create_on_cpu(). - * - * When woken, the thread will run @threadfn() with @data as its - * argument. @threadfn() can either call do_exit() directly if it is a - * standalone thread for which noone will call kthread_stop(), or - * return when 'kthread_should_stop()' is true (which means - * kthread_stop() has been called). The return value should be zero - * or a negative error number; it will be passed to kthread_stop(). - * - * Returns a task_struct or ERR_PTR(-ENOMEM). - */ -struct task_struct *kthread_create(int (*threadfn)(void *data), - void *data, - const char namefmt[], - ...) -{ - struct kthread_create_info create; - - create.threadfn = threadfn; - create.data = data; - init_completion(&create.started); - init_completion(&create.done); - - spin_lock(&kthread_create_lock); - list_add_tail(&create.list, &kthread_create_list); - spin_unlock(&kthread_create_lock); - - wake_up_process(kthreadd_task); - wait_for_completion(&create.done); - - if (!IS_ERR(create.result)) { - va_list args; - va_start(args, namefmt); - vsnprintf(create.result->comm, sizeof(create.result->comm), - namefmt, args); - va_end(args); - } - return create.result; -} -EXPORT_SYMBOL(kthread_create); - -/** - * kthread_bind - bind a just-created kthread to a cpu. - * @k: thread created by kthread_create(). - * @cpu: cpu (might not be online, must be possible) for @k to run on. - * - * Description: This function is equivalent to set_cpus_allowed(), - * except that @cpu doesn't need to be online, and the thread must be - * stopped (i.e., just returned from kthread_create()). - */ -void kthread_bind(struct task_struct *k, unsigned int cpu) -{ - /* Must have done schedule() in kthread() before we set_task_cpu */ - if (!wait_task_inactive(k, TASK_UNINTERRUPTIBLE)) { - WARN_ON(1); - return; - } - set_task_cpu(k, cpu); - k->cpus_allowed = cpumask_of_cpu(cpu); - k->rt.nr_cpus_allowed = 1; - k->flags |= PF_THREAD_BOUND; -} -EXPORT_SYMBOL(kthread_bind); - -/** - * kthread_stop - stop a thread created by kthread_create(). - * @k: thread created by kthread_create(). - * - * Sets kthread_should_stop() for @k to return true, wakes it, and - * waits for it to exit. Your threadfn() must not call do_exit() - * itself if you use this function! This can also be called after - * kthread_create() instead of calling wake_up_process(): the thread - * will exit without calling threadfn(). - * - * Returns the result of threadfn(), or %-EINTR if wake_up_process() - * was never called. - */ -int kthread_stop(struct task_struct *k) -{ - int ret; - - mutex_lock(&kthread_stop_lock); - - /* It could exit after stop_info.k set, but before wake_up_process. */ - get_task_struct(k); - - trace_sched_kthread_stop(k); - - /* Must init completion *before* thread sees kthread_stop_info.k */ - init_completion(&kthread_stop_info.done); - smp_wmb(); - - /* Now set kthread_should_stop() to true, and wake it up. */ - kthread_stop_info.k = k; - wake_up_process(k); - put_task_struct(k); - - /* Once it dies, reset stop ptr, gather result and we're done. */ - wait_for_completion(&kthread_stop_info.done); - kthread_stop_info.k = NULL; - ret = kthread_stop_info.err; - mutex_unlock(&kthread_stop_lock); - - trace_sched_kthread_stop_ret(ret); - - return ret; -} -EXPORT_SYMBOL(kthread_stop); - -int kthreadd(void *unused) -{ - struct task_struct *tsk = current; - - /* Setup a clean context for our children to inherit. */ - set_task_comm(tsk, "kthreadd"); - ignore_signals(tsk); - set_user_nice(tsk, KTHREAD_NICE_LEVEL); - set_cpus_allowed_ptr(tsk, CPU_MASK_ALL_PTR); - - current->flags |= PF_NOFREEZE | PF_FREEZER_NOSIG; - - for (;;) { - set_current_state(TASK_INTERRUPTIBLE); - if (list_empty(&kthread_create_list)) - schedule(); - __set_current_state(TASK_RUNNING); - - spin_lock(&kthread_create_lock); - while (!list_empty(&kthread_create_list)) { - struct kthread_create_info *create; - - create = list_entry(kthread_create_list.next, - struct kthread_create_info, list); - list_del_init(&create->list); - spin_unlock(&kthread_create_lock); - - create_kthread(create); - - spin_lock(&kthread_create_lock); - } - spin_unlock(&kthread_create_lock); - } - - return 0; -} diff --git a/libdde_linux26/contrib/kernel/mutex.c b/libdde_linux26/contrib/kernel/mutex.c deleted file mode 100644 index 0173f29a..00000000 --- a/libdde_linux26/contrib/kernel/mutex.c +++ /dev/null @@ -1,388 +0,0 @@ -/* - * kernel/mutex.c - * - * Mutexes: blocking mutual exclusion locks - * - * Started by Ingo Molnar: - * - * Copyright (C) 2004, 2005, 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com> - * - * Many thanks to Arjan van de Ven, Thomas Gleixner, Steven Rostedt and - * David Howells for suggestions and improvements. - * - * Also see Documentation/mutex-design.txt. - */ -#include <linux/mutex.h> -#include <linux/sched.h> -#include <linux/module.h> -#include <linux/spinlock.h> -#include <linux/interrupt.h> -#include <linux/debug_locks.h> - -/* - * In the DEBUG case we are using the "NULL fastpath" for mutexes, - * which forces all calls into the slowpath: - */ -#ifdef CONFIG_DEBUG_MUTEXES -# include "mutex-debug.h" -# include <asm-generic/mutex-null.h> -#else -# include "mutex.h" -# include <asm/mutex.h> -#endif - -/*** - * mutex_init - initialize the mutex - * @lock: the mutex to be initialized - * @key: the lock_class_key for the class; used by mutex lock debugging - * - * Initialize the mutex to unlocked state. - * - * It is not allowed to initialize an already locked mutex. - */ -void -__dde_mutex_init(struct mutex *lock, const char *name, - struct lock_class_key *key) -{ - atomic_set(&lock->count, 1); - spin_lock_init(&lock->wait_lock); - INIT_LIST_HEAD(&lock->wait_list); - - debug_mutex_init(lock, name, key); -} - -EXPORT_SYMBOL(__dde_mutex_init); - -#ifndef CONFIG_DEBUG_LOCK_ALLOC -/* - * We split the mutex lock/unlock logic into separate fastpath and - * slowpath functions, to reduce the register pressure on the fastpath. - * We also put the fastpath first in the kernel image, to make sure the - * branch is predicted by the CPU as default-untaken. - */ -static __used noinline void __sched -__mutex_lock_slowpath(atomic_t *lock_count); - -/*** - * mutex_lock - acquire the mutex - * @lock: the mutex to be acquired - * - * Lock the mutex exclusively for this task. If the mutex is not - * available right now, it will sleep until it can get it. - * - * The mutex must later on be released by the same task that - * acquired it. Recursive locking is not allowed. The task - * may not exit without first unlocking the mutex. Also, kernel - * memory where the mutex resides mutex must not be freed with - * the mutex still locked. The mutex must first be initialized - * (or statically defined) before it can be locked. memset()-ing - * the mutex to 0 is not allowed. - * - * ( The CONFIG_DEBUG_MUTEXES .config option turns on debugging - * checks that will enforce the restrictions and will also do - * deadlock debugging. ) - * - * This function is similar to (but not equivalent to) down(). - */ -void inline __sched mutex_lock(struct mutex *lock) -{ - might_sleep(); - /* - * The locking fastpath is the 1->0 transition from - * 'unlocked' into 'locked' state. - */ - __mutex_fastpath_lock(&lock->count, __mutex_lock_slowpath); -} - -EXPORT_SYMBOL(mutex_lock); -#endif - -static __used noinline void __sched __mutex_unlock_slowpath(atomic_t *lock_count); - -/*** - * mutex_unlock - release the mutex - * @lock: the mutex to be released - * - * Unlock a mutex that has been locked by this task previously. - * - * This function must not be used in interrupt context. Unlocking - * of a not locked mutex is not allowed. - * - * This function is similar to (but not equivalent to) up(). - */ -void __sched mutex_unlock(struct mutex *lock) -{ - /* - * The unlocking fastpath is the 0->1 transition from 'locked' - * into 'unlocked' state: - */ - __mutex_fastpath_unlock(&lock->count, __mutex_unlock_slowpath); -} - -EXPORT_SYMBOL(mutex_unlock); - -/* - * Lock a mutex (possibly interruptible), slowpath: - */ -static inline int __sched -__mutex_lock_common(struct mutex *lock, long state, unsigned int subclass, - unsigned long ip) -{ - struct task_struct *task = current; - struct mutex_waiter waiter; - unsigned int old_val; - unsigned long flags; - - spin_lock_mutex(&lock->wait_lock, flags); - - debug_mutex_lock_common(lock, &waiter); - mutex_acquire(&lock->dep_map, subclass, 0, ip); - debug_mutex_add_waiter(lock, &waiter, task_thread_info(task)); - - /* add waiting tasks to the end of the waitqueue (FIFO): */ - list_add_tail(&waiter.list, &lock->wait_list); - waiter.task = task; - - old_val = atomic_xchg(&lock->count, -1); - if (old_val == 1) - goto done; - - lock_contended(&lock->dep_map, ip); - - for (;;) { - /* - * Lets try to take the lock again - this is needed even if - * we get here for the first time (shortly after failing to - * acquire the lock), to make sure that we get a wakeup once - * it's unlocked. Later on, if we sleep, this is the - * operation that gives us the lock. We xchg it to -1, so - * that when we release the lock, we properly wake up the - * other waiters: - */ - old_val = atomic_xchg(&lock->count, -1); - if (old_val == 1) - break; - - /* - * got a signal? (This code gets eliminated in the - * TASK_UNINTERRUPTIBLE case.) - */ - if (unlikely(signal_pending_state(state, task))) { - mutex_remove_waiter(lock, &waiter, - task_thread_info(task)); - mutex_release(&lock->dep_map, 1, ip); - spin_unlock_mutex(&lock->wait_lock, flags); - - debug_mutex_free_waiter(&waiter); - return -EINTR; - } - __set_task_state(task, state); - - /* didnt get the lock, go to sleep: */ - spin_unlock_mutex(&lock->wait_lock, flags); - schedule(); - spin_lock_mutex(&lock->wait_lock, flags); - } - -done: - lock_acquired(&lock->dep_map, ip); - /* got the lock - rejoice! */ - mutex_remove_waiter(lock, &waiter, task_thread_info(task)); - debug_mutex_set_owner(lock, task_thread_info(task)); - - /* set it to 0 if there are no waiters left: */ - if (likely(list_empty(&lock->wait_list))) - atomic_set(&lock->count, 0); - - spin_unlock_mutex(&lock->wait_lock, flags); - - debug_mutex_free_waiter(&waiter); - - return 0; -} - -#ifdef CONFIG_DEBUG_LOCK_ALLOC -void __sched -mutex_lock_nested(struct mutex *lock, unsigned int subclass) -{ - might_sleep(); - __mutex_lock_common(lock, TASK_UNINTERRUPTIBLE, subclass, _RET_IP_); -} - -EXPORT_SYMBOL_GPL(mutex_lock_nested); - -int __sched -mutex_lock_killable_nested(struct mutex *lock, unsigned int subclass) -{ - might_sleep(); - return __mutex_lock_common(lock, TASK_KILLABLE, subclass, _RET_IP_); -} -EXPORT_SYMBOL_GPL(mutex_lock_killable_nested); - -int __sched -mutex_lock_interruptible_nested(struct mutex *lock, unsigned int subclass) -{ - might_sleep(); - return __mutex_lock_common(lock, TASK_INTERRUPTIBLE, subclass, _RET_IP_); -} - -EXPORT_SYMBOL_GPL(mutex_lock_interruptible_nested); -#endif - -/* - * Release the lock, slowpath: - */ -static inline void -__mutex_unlock_common_slowpath(atomic_t *lock_count, int nested) -{ - struct mutex *lock = container_of(lock_count, struct mutex, count); - unsigned long flags; - - spin_lock_mutex(&lock->wait_lock, flags); - mutex_release(&lock->dep_map, nested, _RET_IP_); - debug_mutex_unlock(lock); - - /* - * some architectures leave the lock unlocked in the fastpath failure - * case, others need to leave it locked. In the later case we have to - * unlock it here - */ - if (__mutex_slowpath_needs_to_unlock()) - atomic_set(&lock->count, 1); - - if (!list_empty(&lock->wait_list)) { - /* get the first entry from the wait-list: */ - struct mutex_waiter *waiter = - list_entry(lock->wait_list.next, - struct mutex_waiter, list); - - debug_mutex_wake_waiter(lock, waiter); - - wake_up_process(waiter->task); - } - - debug_mutex_clear_owner(lock); - - spin_unlock_mutex(&lock->wait_lock, flags); -} - -/* - * Release the lock, slowpath: - */ -static __used noinline void -__mutex_unlock_slowpath(atomic_t *lock_count) -{ - __mutex_unlock_common_slowpath(lock_count, 1); -} - -#ifndef CONFIG_DEBUG_LOCK_ALLOC -/* - * Here come the less common (and hence less performance-critical) APIs: - * mutex_lock_interruptible() and mutex_trylock(). - */ -static noinline int __sched -__mutex_lock_killable_slowpath(atomic_t *lock_count); - -static noinline int __sched -__mutex_lock_interruptible_slowpath(atomic_t *lock_count); - -/*** - * mutex_lock_interruptible - acquire the mutex, interruptable - * @lock: the mutex to be acquired - * - * Lock the mutex like mutex_lock(), and return 0 if the mutex has - * been acquired or sleep until the mutex becomes available. If a - * signal arrives while waiting for the lock then this function - * returns -EINTR. - * - * This function is similar to (but not equivalent to) down_interruptible(). - */ -int __sched mutex_lock_interruptible(struct mutex *lock) -{ - might_sleep(); - return __mutex_fastpath_lock_retval - (&lock->count, __mutex_lock_interruptible_slowpath); -} - -EXPORT_SYMBOL(mutex_lock_interruptible); - -int __sched mutex_lock_killable(struct mutex *lock) -{ - might_sleep(); - return __mutex_fastpath_lock_retval - (&lock->count, __mutex_lock_killable_slowpath); -} -EXPORT_SYMBOL(mutex_lock_killable); - -static __used noinline void __sched -__mutex_lock_slowpath(atomic_t *lock_count) -{ - struct mutex *lock = container_of(lock_count, struct mutex, count); - - __mutex_lock_common(lock, TASK_UNINTERRUPTIBLE, 0, _RET_IP_); -} - -static noinline int __sched -__mutex_lock_killable_slowpath(atomic_t *lock_count) -{ - struct mutex *lock = container_of(lock_count, struct mutex, count); - - return __mutex_lock_common(lock, TASK_KILLABLE, 0, _RET_IP_); -} - -static noinline int __sched -__mutex_lock_interruptible_slowpath(atomic_t *lock_count) -{ - struct mutex *lock = container_of(lock_count, struct mutex, count); - - return __mutex_lock_common(lock, TASK_INTERRUPTIBLE, 0, _RET_IP_); -} -#endif - -/* - * Spinlock based trylock, we take the spinlock and check whether we - * can get the lock: - */ -static inline int __mutex_trylock_slowpath(atomic_t *lock_count) -{ - struct mutex *lock = container_of(lock_count, struct mutex, count); - unsigned long flags; - int prev; - - spin_lock_mutex(&lock->wait_lock, flags); - - prev = atomic_xchg(&lock->count, -1); - if (likely(prev == 1)) { - debug_mutex_set_owner(lock, current_thread_info()); - mutex_acquire(&lock->dep_map, 0, 1, _RET_IP_); - } - /* Set it back to 0 if there are no waiters: */ - if (likely(list_empty(&lock->wait_list))) - atomic_set(&lock->count, 0); - - spin_unlock_mutex(&lock->wait_lock, flags); - - return prev == 1; -} - -/*** - * mutex_trylock - try acquire the mutex, without waiting - * @lock: the mutex to be acquired - * - * Try to acquire the mutex atomically. Returns 1 if the mutex - * has been acquired successfully, and 0 on contention. - * - * NOTE: this function follows the spin_trylock() convention, so - * it is negated to the down_trylock() return values! Be careful - * about this when converting semaphore users to mutexes. - * - * This function must not be used in interrupt context. The - * mutex must be released by the same task that acquired it. - */ -int __sched mutex_trylock(struct mutex *lock) -{ - return __mutex_fastpath_trylock(&lock->count, - __mutex_trylock_slowpath); -} - -EXPORT_SYMBOL(mutex_trylock); diff --git a/libdde_linux26/contrib/kernel/mutex.h b/libdde_linux26/contrib/kernel/mutex.h deleted file mode 100644 index a075dafb..00000000 --- a/libdde_linux26/contrib/kernel/mutex.h +++ /dev/null @@ -1,30 +0,0 @@ -/* - * Mutexes: blocking mutual exclusion locks - * - * started by Ingo Molnar: - * - * Copyright (C) 2004, 2005, 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com> - * - * This file contains mutex debugging related internal prototypes, for the - * !CONFIG_DEBUG_MUTEXES case. Most of them are NOPs: - */ - -#define spin_lock_mutex(lock, flags) \ - do { spin_lock(lock); (void)(flags); } while (0) -#define spin_unlock_mutex(lock, flags) \ - do { spin_unlock(lock); (void)(flags); } while (0) -#define mutex_remove_waiter(lock, waiter, ti) \ - __list_del((waiter)->list.prev, (waiter)->list.next) - -#define debug_mutex_set_owner(lock, new_owner) do { } while (0) -#define debug_mutex_clear_owner(lock) do { } while (0) -#define debug_mutex_wake_waiter(lock, waiter) do { } while (0) -#define debug_mutex_free_waiter(waiter) do { } while (0) -#define debug_mutex_add_waiter(lock, waiter, ti) do { } while (0) -#define debug_mutex_unlock(lock) do { } while (0) -#define debug_mutex_init(lock, name, key) do { } while (0) - -static inline void -debug_mutex_lock_common(struct mutex *lock, struct mutex_waiter *waiter) -{ -} diff --git a/libdde_linux26/contrib/kernel/notifier.c b/libdde_linux26/contrib/kernel/notifier.c deleted file mode 100644 index 61d5aa5e..00000000 --- a/libdde_linux26/contrib/kernel/notifier.c +++ /dev/null @@ -1,586 +0,0 @@ -#include <linux/kdebug.h> -#include <linux/kprobes.h> -#include <linux/module.h> -#include <linux/notifier.h> -#include <linux/rcupdate.h> -#include <linux/vmalloc.h> -#include <linux/reboot.h> - -/* - * Notifier list for kernel code which wants to be called - * at shutdown. This is used to stop any idling DMA operations - * and the like. - */ -BLOCKING_NOTIFIER_HEAD(reboot_notifier_list); - -/* - * Notifier chain core routines. The exported routines below - * are layered on top of these, with appropriate locking added. - */ - -static int notifier_chain_register(struct notifier_block **nl, - struct notifier_block *n) -{ - while ((*nl) != NULL) { - if (n->priority > (*nl)->priority) - break; - nl = &((*nl)->next); - } - n->next = *nl; - rcu_assign_pointer(*nl, n); - return 0; -} - -static int notifier_chain_cond_register(struct notifier_block **nl, - struct notifier_block *n) -{ - while ((*nl) != NULL) { - if ((*nl) == n) - return 0; - if (n->priority > (*nl)->priority) - break; - nl = &((*nl)->next); - } - n->next = *nl; - rcu_assign_pointer(*nl, n); - return 0; -} - -static int notifier_chain_unregister(struct notifier_block **nl, - struct notifier_block *n) -{ - while ((*nl) != NULL) { - if ((*nl) == n) { - rcu_assign_pointer(*nl, n->next); - return 0; - } - nl = &((*nl)->next); - } - return -ENOENT; -} - -/** - * notifier_call_chain - Informs the registered notifiers about an event. - * @nl: Pointer to head of the blocking notifier chain - * @val: Value passed unmodified to notifier function - * @v: Pointer passed unmodified to notifier function - * @nr_to_call: Number of notifier functions to be called. Don't care - * value of this parameter is -1. - * @nr_calls: Records the number of notifications sent. Don't care - * value of this field is NULL. - * @returns: notifier_call_chain returns the value returned by the - * last notifier function called. - */ -static int __kprobes notifier_call_chain(struct notifier_block **nl, - unsigned long val, void *v, - int nr_to_call, int *nr_calls) -{ - int ret = NOTIFY_DONE; - struct notifier_block *nb, *next_nb; - - nb = rcu_dereference(*nl); - - while (nb && nr_to_call) { - next_nb = rcu_dereference(nb->next); - -#ifdef CONFIG_DEBUG_NOTIFIERS - if (unlikely(!func_ptr_is_kernel_text(nb->notifier_call))) { - WARN(1, "Invalid notifier called!"); - nb = next_nb; - continue; - } -#endif - ret = nb->notifier_call(nb, val, v); - - if (nr_calls) - (*nr_calls)++; - - if ((ret & NOTIFY_STOP_MASK) == NOTIFY_STOP_MASK) - break; - nb = next_nb; - nr_to_call--; - } - return ret; -} - -/* - * Atomic notifier chain routines. Registration and unregistration - * use a spinlock, and call_chain is synchronized by RCU (no locks). - */ - -/** - * atomic_notifier_chain_register - Add notifier to an atomic notifier chain - * @nh: Pointer to head of the atomic notifier chain - * @n: New entry in notifier chain - * - * Adds a notifier to an atomic notifier chain. - * - * Currently always returns zero. - */ -int atomic_notifier_chain_register(struct atomic_notifier_head *nh, - struct notifier_block *n) -{ - unsigned long flags; - int ret; - - spin_lock_irqsave(&nh->lock, flags); - ret = notifier_chain_register(&nh->head, n); - spin_unlock_irqrestore(&nh->lock, flags); - return ret; -} -EXPORT_SYMBOL_GPL(atomic_notifier_chain_register); - -/** - * atomic_notifier_chain_unregister - Remove notifier from an atomic notifier chain - * @nh: Pointer to head of the atomic notifier chain - * @n: Entry to remove from notifier chain - * - * Removes a notifier from an atomic notifier chain. - * - * Returns zero on success or %-ENOENT on failure. - */ -int atomic_notifier_chain_unregister(struct atomic_notifier_head *nh, - struct notifier_block *n) -{ - unsigned long flags; - int ret; - - spin_lock_irqsave(&nh->lock, flags); - ret = notifier_chain_unregister(&nh->head, n); - spin_unlock_irqrestore(&nh->lock, flags); - synchronize_rcu(); - return ret; -} -EXPORT_SYMBOL_GPL(atomic_notifier_chain_unregister); - -/** - * __atomic_notifier_call_chain - Call functions in an atomic notifier chain - * @nh: Pointer to head of the atomic notifier chain - * @val: Value passed unmodified to notifier function - * @v: Pointer passed unmodified to notifier function - * @nr_to_call: See the comment for notifier_call_chain. - * @nr_calls: See the comment for notifier_call_chain. - * - * Calls each function in a notifier chain in turn. The functions - * run in an atomic context, so they must not block. - * This routine uses RCU to synchronize with changes to the chain. - * - * If the return value of the notifier can be and'ed - * with %NOTIFY_STOP_MASK then atomic_notifier_call_chain() - * will return immediately, with the return value of - * the notifier function which halted execution. - * Otherwise the return value is the return value - * of the last notifier function called. - */ -int __kprobes __atomic_notifier_call_chain(struct atomic_notifier_head *nh, - unsigned long val, void *v, - int nr_to_call, int *nr_calls) -{ - int ret; - - rcu_read_lock(); - ret = notifier_call_chain(&nh->head, val, v, nr_to_call, nr_calls); - rcu_read_unlock(); - return ret; -} -EXPORT_SYMBOL_GPL(__atomic_notifier_call_chain); - -int __kprobes atomic_notifier_call_chain(struct atomic_notifier_head *nh, - unsigned long val, void *v) -{ - return __atomic_notifier_call_chain(nh, val, v, -1, NULL); -} -EXPORT_SYMBOL_GPL(atomic_notifier_call_chain); - -/* - * Blocking notifier chain routines. All access to the chain is - * synchronized by an rwsem. - */ - -/** - * blocking_notifier_chain_register - Add notifier to a blocking notifier chain - * @nh: Pointer to head of the blocking notifier chain - * @n: New entry in notifier chain - * - * Adds a notifier to a blocking notifier chain. - * Must be called in process context. - * - * Currently always returns zero. - */ -int blocking_notifier_chain_register(struct blocking_notifier_head *nh, - struct notifier_block *n) -{ - int ret; - - /* - * This code gets used during boot-up, when task switching is - * not yet working and interrupts must remain disabled. At - * such times we must not call down_write(). - */ - if (unlikely(system_state == SYSTEM_BOOTING)) - return notifier_chain_register(&nh->head, n); - - down_write(&nh->rwsem); - ret = notifier_chain_register(&nh->head, n); - up_write(&nh->rwsem); - return ret; -} -EXPORT_SYMBOL_GPL(blocking_notifier_chain_register); - -/** - * blocking_notifier_chain_cond_register - Cond add notifier to a blocking notifier chain - * @nh: Pointer to head of the blocking notifier chain - * @n: New entry in notifier chain - * - * Adds a notifier to a blocking notifier chain, only if not already - * present in the chain. - * Must be called in process context. - * - * Currently always returns zero. - */ -int blocking_notifier_chain_cond_register(struct blocking_notifier_head *nh, - struct notifier_block *n) -{ - int ret; - - down_write(&nh->rwsem); - ret = notifier_chain_cond_register(&nh->head, n); - up_write(&nh->rwsem); - return ret; -} -EXPORT_SYMBOL_GPL(blocking_notifier_chain_cond_register); - -/** - * blocking_notifier_chain_unregister - Remove notifier from a blocking notifier chain - * @nh: Pointer to head of the blocking notifier chain - * @n: Entry to remove from notifier chain - * - * Removes a notifier from a blocking notifier chain. - * Must be called from process context. - * - * Returns zero on success or %-ENOENT on failure. - */ -int blocking_notifier_chain_unregister(struct blocking_notifier_head *nh, - struct notifier_block *n) -{ - int ret; - - /* - * This code gets used during boot-up, when task switching is - * not yet working and interrupts must remain disabled. At - * such times we must not call down_write(). - */ - if (unlikely(system_state == SYSTEM_BOOTING)) - return notifier_chain_unregister(&nh->head, n); - - down_write(&nh->rwsem); - ret = notifier_chain_unregister(&nh->head, n); - up_write(&nh->rwsem); - return ret; -} -EXPORT_SYMBOL_GPL(blocking_notifier_chain_unregister); - -/** - * __blocking_notifier_call_chain - Call functions in a blocking notifier chain - * @nh: Pointer to head of the blocking notifier chain - * @val: Value passed unmodified to notifier function - * @v: Pointer passed unmodified to notifier function - * @nr_to_call: See comment for notifier_call_chain. - * @nr_calls: See comment for notifier_call_chain. - * - * Calls each function in a notifier chain in turn. The functions - * run in a process context, so they are allowed to block. - * - * If the return value of the notifier can be and'ed - * with %NOTIFY_STOP_MASK then blocking_notifier_call_chain() - * will return immediately, with the return value of - * the notifier function which halted execution. - * Otherwise the return value is the return value - * of the last notifier function called. - */ -int __blocking_notifier_call_chain(struct blocking_notifier_head *nh, - unsigned long val, void *v, - int nr_to_call, int *nr_calls) -{ - int ret = NOTIFY_DONE; - - /* - * We check the head outside the lock, but if this access is - * racy then it does not matter what the result of the test - * is, we re-check the list after having taken the lock anyway: - */ - if (rcu_dereference(nh->head)) { - down_read(&nh->rwsem); - ret = notifier_call_chain(&nh->head, val, v, nr_to_call, - nr_calls); - up_read(&nh->rwsem); - } - return ret; -} -EXPORT_SYMBOL_GPL(__blocking_notifier_call_chain); - -int blocking_notifier_call_chain(struct blocking_notifier_head *nh, - unsigned long val, void *v) -{ - return __blocking_notifier_call_chain(nh, val, v, -1, NULL); -} -EXPORT_SYMBOL_GPL(blocking_notifier_call_chain); - -/* - * Raw notifier chain routines. There is no protection; - * the caller must provide it. Use at your own risk! - */ - -/** - * raw_notifier_chain_register - Add notifier to a raw notifier chain - * @nh: Pointer to head of the raw notifier chain - * @n: New entry in notifier chain - * - * Adds a notifier to a raw notifier chain. - * All locking must be provided by the caller. - * - * Currently always returns zero. - */ -int raw_notifier_chain_register(struct raw_notifier_head *nh, - struct notifier_block *n) -{ - return notifier_chain_register(&nh->head, n); -} -EXPORT_SYMBOL_GPL(raw_notifier_chain_register); - -/** - * raw_notifier_chain_unregister - Remove notifier from a raw notifier chain - * @nh: Pointer to head of the raw notifier chain - * @n: Entry to remove from notifier chain - * - * Removes a notifier from a raw notifier chain. - * All locking must be provided by the caller. - * - * Returns zero on success or %-ENOENT on failure. - */ -int raw_notifier_chain_unregister(struct raw_notifier_head *nh, - struct notifier_block *n) -{ - return notifier_chain_unregister(&nh->head, n); -} -EXPORT_SYMBOL_GPL(raw_notifier_chain_unregister); - -/** - * __raw_notifier_call_chain - Call functions in a raw notifier chain - * @nh: Pointer to head of the raw notifier chain - * @val: Value passed unmodified to notifier function - * @v: Pointer passed unmodified to notifier function - * @nr_to_call: See comment for notifier_call_chain. - * @nr_calls: See comment for notifier_call_chain - * - * Calls each function in a notifier chain in turn. The functions - * run in an undefined context. - * All locking must be provided by the caller. - * - * If the return value of the notifier can be and'ed - * with %NOTIFY_STOP_MASK then raw_notifier_call_chain() - * will return immediately, with the return value of - * the notifier function which halted execution. - * Otherwise the return value is the return value - * of the last notifier function called. - */ -int __raw_notifier_call_chain(struct raw_notifier_head *nh, - unsigned long val, void *v, - int nr_to_call, int *nr_calls) -{ - return notifier_call_chain(&nh->head, val, v, nr_to_call, nr_calls); -} -EXPORT_SYMBOL_GPL(__raw_notifier_call_chain); - -int raw_notifier_call_chain(struct raw_notifier_head *nh, - unsigned long val, void *v) -{ - return __raw_notifier_call_chain(nh, val, v, -1, NULL); -} -EXPORT_SYMBOL_GPL(raw_notifier_call_chain); - -/* - * SRCU notifier chain routines. Registration and unregistration - * use a mutex, and call_chain is synchronized by SRCU (no locks). - */ - -/** - * srcu_notifier_chain_register - Add notifier to an SRCU notifier chain - * @nh: Pointer to head of the SRCU notifier chain - * @n: New entry in notifier chain - * - * Adds a notifier to an SRCU notifier chain. - * Must be called in process context. - * - * Currently always returns zero. - */ -int srcu_notifier_chain_register(struct srcu_notifier_head *nh, - struct notifier_block *n) -{ - int ret; - - /* - * This code gets used during boot-up, when task switching is - * not yet working and interrupts must remain disabled. At - * such times we must not call mutex_lock(). - */ - if (unlikely(system_state == SYSTEM_BOOTING)) - return notifier_chain_register(&nh->head, n); - - mutex_lock(&nh->mutex); - ret = notifier_chain_register(&nh->head, n); - mutex_unlock(&nh->mutex); - return ret; -} -EXPORT_SYMBOL_GPL(srcu_notifier_chain_register); - -/** - * srcu_notifier_chain_unregister - Remove notifier from an SRCU notifier chain - * @nh: Pointer to head of the SRCU notifier chain - * @n: Entry to remove from notifier chain - * - * Removes a notifier from an SRCU notifier chain. - * Must be called from process context. - * - * Returns zero on success or %-ENOENT on failure. - */ -int srcu_notifier_chain_unregister(struct srcu_notifier_head *nh, - struct notifier_block *n) -{ - int ret; - - /* - * This code gets used during boot-up, when task switching is - * not yet working and interrupts must remain disabled. At - * such times we must not call mutex_lock(). - */ - if (unlikely(system_state == SYSTEM_BOOTING)) - return notifier_chain_unregister(&nh->head, n); - - mutex_lock(&nh->mutex); - ret = notifier_chain_unregister(&nh->head, n); - mutex_unlock(&nh->mutex); - synchronize_srcu(&nh->srcu); - return ret; -} -EXPORT_SYMBOL_GPL(srcu_notifier_chain_unregister); - -/** - * __srcu_notifier_call_chain - Call functions in an SRCU notifier chain - * @nh: Pointer to head of the SRCU notifier chain - * @val: Value passed unmodified to notifier function - * @v: Pointer passed unmodified to notifier function - * @nr_to_call: See comment for notifier_call_chain. - * @nr_calls: See comment for notifier_call_chain - * - * Calls each function in a notifier chain in turn. The functions - * run in a process context, so they are allowed to block. - * - * If the return value of the notifier can be and'ed - * with %NOTIFY_STOP_MASK then srcu_notifier_call_chain() - * will return immediately, with the return value of - * the notifier function which halted execution. - * Otherwise the return value is the return value - * of the last notifier function called. - */ -int __srcu_notifier_call_chain(struct srcu_notifier_head *nh, - unsigned long val, void *v, - int nr_to_call, int *nr_calls) -{ - int ret; - int idx; - - idx = srcu_read_lock(&nh->srcu); - ret = notifier_call_chain(&nh->head, val, v, nr_to_call, nr_calls); - srcu_read_unlock(&nh->srcu, idx); - return ret; -} -EXPORT_SYMBOL_GPL(__srcu_notifier_call_chain); - -int srcu_notifier_call_chain(struct srcu_notifier_head *nh, - unsigned long val, void *v) -{ - return __srcu_notifier_call_chain(nh, val, v, -1, NULL); -} -EXPORT_SYMBOL_GPL(srcu_notifier_call_chain); - -/** - * srcu_init_notifier_head - Initialize an SRCU notifier head - * @nh: Pointer to head of the srcu notifier chain - * - * Unlike other sorts of notifier heads, SRCU notifier heads require - * dynamic initialization. Be sure to call this routine before - * calling any of the other SRCU notifier routines for this head. - * - * If an SRCU notifier head is deallocated, it must first be cleaned - * up by calling srcu_cleanup_notifier_head(). Otherwise the head's - * per-cpu data (used by the SRCU mechanism) will leak. - */ -void srcu_init_notifier_head(struct srcu_notifier_head *nh) -{ - mutex_init(&nh->mutex); - if (init_srcu_struct(&nh->srcu) < 0) - BUG(); - nh->head = NULL; -} -EXPORT_SYMBOL_GPL(srcu_init_notifier_head); - -/** - * register_reboot_notifier - Register function to be called at reboot time - * @nb: Info about notifier function to be called - * - * Registers a function with the list of functions - * to be called at reboot time. - * - * Currently always returns zero, as blocking_notifier_chain_register() - * always returns zero. - */ -int register_reboot_notifier(struct notifier_block *nb) -{ - return blocking_notifier_chain_register(&reboot_notifier_list, nb); -} -EXPORT_SYMBOL(register_reboot_notifier); - -/** - * unregister_reboot_notifier - Unregister previously registered reboot notifier - * @nb: Hook to be unregistered - * - * Unregisters a previously registered reboot - * notifier function. - * - * Returns zero on success, or %-ENOENT on failure. - */ -int unregister_reboot_notifier(struct notifier_block *nb) -{ - return blocking_notifier_chain_unregister(&reboot_notifier_list, nb); -} -EXPORT_SYMBOL(unregister_reboot_notifier); - -static ATOMIC_NOTIFIER_HEAD(die_chain); - -int notrace notify_die(enum die_val val, const char *str, - struct pt_regs *regs, long err, int trap, int sig) -{ - struct die_args args = { - .regs = regs, - .str = str, - .err = err, - .trapnr = trap, - .signr = sig, - - }; - return atomic_notifier_call_chain(&die_chain, val, &args); -} - -int register_die_notifier(struct notifier_block *nb) -{ - vmalloc_sync_all(); - return atomic_notifier_chain_register(&die_chain, nb); -} -EXPORT_SYMBOL_GPL(register_die_notifier); - -int unregister_die_notifier(struct notifier_block *nb) -{ - return atomic_notifier_chain_unregister(&die_chain, nb); -} -EXPORT_SYMBOL_GPL(unregister_die_notifier); diff --git a/libdde_linux26/contrib/kernel/rcupdate.c b/libdde_linux26/contrib/kernel/rcupdate.c deleted file mode 100644 index cae8a059..00000000 --- a/libdde_linux26/contrib/kernel/rcupdate.c +++ /dev/null @@ -1,189 +0,0 @@ -/* - * Read-Copy Update mechanism for mutual exclusion - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. - * - * Copyright IBM Corporation, 2001 - * - * Authors: Dipankar Sarma <dipankar@in.ibm.com> - * Manfred Spraul <manfred@colorfullife.com> - * - * Based on the original work by Paul McKenney <paulmck@us.ibm.com> - * and inputs from Rusty Russell, Andrea Arcangeli and Andi Kleen. - * Papers: - * http://www.rdrop.com/users/paulmck/paper/rclockpdcsproof.pdf - * http://lse.sourceforge.net/locking/rclock_OLS.2001.05.01c.sc.pdf (OLS2001) - * - * For detailed explanation of Read-Copy Update mechanism see - - * http://lse.sourceforge.net/locking/rcupdate.html - * - */ -#include <linux/types.h> -#include <linux/kernel.h> -#include <linux/init.h> -#include <linux/spinlock.h> -#include <linux/smp.h> -#include <linux/interrupt.h> -#include <linux/sched.h> -#include <asm/atomic.h> -#include <linux/bitops.h> -#include <linux/percpu.h> -#include <linux/notifier.h> -#include <linux/cpu.h> -#include <linux/mutex.h> -#include <linux/module.h> -#include <linux/kernel_stat.h> - -enum rcu_barrier { - RCU_BARRIER_STD, - RCU_BARRIER_BH, - RCU_BARRIER_SCHED, -}; - -static DEFINE_PER_CPU(struct rcu_head, rcu_barrier_head) = {NULL}; -static atomic_t rcu_barrier_cpu_count; -static DEFINE_MUTEX(rcu_barrier_mutex); -static struct completion rcu_barrier_completion; -int rcu_scheduler_active __read_mostly; - -/* - * Awaken the corresponding synchronize_rcu() instance now that a - * grace period has elapsed. - */ -void wakeme_after_rcu(struct rcu_head *head) -{ - struct rcu_synchronize *rcu; - - rcu = container_of(head, struct rcu_synchronize, head); - complete(&rcu->completion); -} - -/** - * synchronize_rcu - wait until a grace period has elapsed. - * - * Control will return to the caller some time after a full grace - * period has elapsed, in other words after all currently executing RCU - * read-side critical sections have completed. RCU read-side critical - * sections are delimited by rcu_read_lock() and rcu_read_unlock(), - * and may be nested. - */ -void synchronize_rcu(void) -{ - struct rcu_synchronize rcu; - - if (rcu_blocking_is_gp()) - return; - - init_completion(&rcu.completion); - /* Will wake me after RCU finished. */ - call_rcu(&rcu.head, wakeme_after_rcu); - /* Wait for it. */ - wait_for_completion(&rcu.completion); -} -EXPORT_SYMBOL_GPL(synchronize_rcu); - -static void rcu_barrier_callback(struct rcu_head *notused) -{ - if (atomic_dec_and_test(&rcu_barrier_cpu_count)) - complete(&rcu_barrier_completion); -} - -/* - * Called with preemption disabled, and from cross-cpu IRQ context. - */ -static void rcu_barrier_func(void *type) -{ - int cpu = smp_processor_id(); - struct rcu_head *head = &per_cpu(rcu_barrier_head, cpu); - - atomic_inc(&rcu_barrier_cpu_count); - switch ((enum rcu_barrier)type) { - case RCU_BARRIER_STD: - call_rcu(head, rcu_barrier_callback); - break; - case RCU_BARRIER_BH: - call_rcu_bh(head, rcu_barrier_callback); - break; - case RCU_BARRIER_SCHED: - call_rcu_sched(head, rcu_barrier_callback); - break; - } -} - -/* - * Orchestrate the specified type of RCU barrier, waiting for all - * RCU callbacks of the specified type to complete. - */ -static void _rcu_barrier(enum rcu_barrier type) -{ - BUG_ON(in_interrupt()); - /* Take cpucontrol mutex to protect against CPU hotplug */ - mutex_lock(&rcu_barrier_mutex); - init_completion(&rcu_barrier_completion); - /* - * Initialize rcu_barrier_cpu_count to 1, then invoke - * rcu_barrier_func() on each CPU, so that each CPU also has - * incremented rcu_barrier_cpu_count. Only then is it safe to - * decrement rcu_barrier_cpu_count -- otherwise the first CPU - * might complete its grace period before all of the other CPUs - * did their increment, causing this function to return too - * early. - */ - atomic_set(&rcu_barrier_cpu_count, 1); - on_each_cpu(rcu_barrier_func, (void *)type, 1); - if (atomic_dec_and_test(&rcu_barrier_cpu_count)) - complete(&rcu_barrier_completion); - wait_for_completion(&rcu_barrier_completion); - mutex_unlock(&rcu_barrier_mutex); -} - -/** - * rcu_barrier - Wait until all in-flight call_rcu() callbacks complete. - */ -void rcu_barrier(void) -{ - _rcu_barrier(RCU_BARRIER_STD); -} -EXPORT_SYMBOL_GPL(rcu_barrier); - -/** - * rcu_barrier_bh - Wait until all in-flight call_rcu_bh() callbacks complete. - */ -void rcu_barrier_bh(void) -{ - _rcu_barrier(RCU_BARRIER_BH); -} -EXPORT_SYMBOL_GPL(rcu_barrier_bh); - -/** - * rcu_barrier_sched - Wait for in-flight call_rcu_sched() callbacks. - */ -void rcu_barrier_sched(void) -{ - _rcu_barrier(RCU_BARRIER_SCHED); -} -EXPORT_SYMBOL_GPL(rcu_barrier_sched); - -void __init rcu_init(void) -{ - __rcu_init(); -} - -void rcu_scheduler_starting(void) -{ - WARN_ON(num_online_cpus() != 1); - WARN_ON(nr_context_switches() > 0); - rcu_scheduler_active = 1; -} diff --git a/libdde_linux26/contrib/kernel/rwsem.c b/libdde_linux26/contrib/kernel/rwsem.c deleted file mode 100644 index cae050b0..00000000 --- a/libdde_linux26/contrib/kernel/rwsem.c +++ /dev/null @@ -1,148 +0,0 @@ -/* kernel/rwsem.c: R/W semaphores, public implementation - * - * Written by David Howells (dhowells@redhat.com). - * Derived from asm-i386/semaphore.h - */ - -#include <linux/types.h> -#include <linux/kernel.h> -#include <linux/sched.h> -#include <linux/module.h> -#include <linux/rwsem.h> - -#include <asm/system.h> -#include <asm/atomic.h> - -/* - * lock for reading - */ -void __sched down_read(struct rw_semaphore *sem) -{ - might_sleep(); - rwsem_acquire_read(&sem->dep_map, 0, 0, _RET_IP_); - - LOCK_CONTENDED(sem, __down_read_trylock, __down_read); -} - -EXPORT_SYMBOL(down_read); - -/* - * trylock for reading -- returns 1 if successful, 0 if contention - */ -int down_read_trylock(struct rw_semaphore *sem) -{ - int ret = __down_read_trylock(sem); - - if (ret == 1) - rwsem_acquire_read(&sem->dep_map, 0, 1, _RET_IP_); - return ret; -} - -EXPORT_SYMBOL(down_read_trylock); - -/* - * lock for writing - */ -void __sched down_write(struct rw_semaphore *sem) -{ - might_sleep(); - rwsem_acquire(&sem->dep_map, 0, 0, _RET_IP_); - - LOCK_CONTENDED(sem, __down_write_trylock, __down_write); -} - -EXPORT_SYMBOL(down_write); - -/* - * trylock for writing -- returns 1 if successful, 0 if contention - */ -int down_write_trylock(struct rw_semaphore *sem) -{ - int ret = __down_write_trylock(sem); - - if (ret == 1) - rwsem_acquire(&sem->dep_map, 0, 1, _RET_IP_); - return ret; -} - -EXPORT_SYMBOL(down_write_trylock); - -/* - * release a read lock - */ -void up_read(struct rw_semaphore *sem) -{ - rwsem_release(&sem->dep_map, 1, _RET_IP_); - - __up_read(sem); -} - -EXPORT_SYMBOL(up_read); - -/* - * release a write lock - */ -void up_write(struct rw_semaphore *sem) -{ - rwsem_release(&sem->dep_map, 1, _RET_IP_); - - __up_write(sem); -} - -EXPORT_SYMBOL(up_write); - -/* - * downgrade write lock to read lock - */ -void downgrade_write(struct rw_semaphore *sem) -{ - /* - * lockdep: a downgraded write will live on as a write - * dependency. - */ - __downgrade_write(sem); -} - -EXPORT_SYMBOL(downgrade_write); - -#ifdef CONFIG_DEBUG_LOCK_ALLOC - -void down_read_nested(struct rw_semaphore *sem, int subclass) -{ - might_sleep(); - rwsem_acquire_read(&sem->dep_map, subclass, 0, _RET_IP_); - - LOCK_CONTENDED(sem, __down_read_trylock, __down_read); -} - -EXPORT_SYMBOL(down_read_nested); - -void down_read_non_owner(struct rw_semaphore *sem) -{ - might_sleep(); - - __down_read(sem); -} - -EXPORT_SYMBOL(down_read_non_owner); - -void down_write_nested(struct rw_semaphore *sem, int subclass) -{ - might_sleep(); - rwsem_acquire(&sem->dep_map, subclass, 0, _RET_IP_); - - LOCK_CONTENDED(sem, __down_write_trylock, __down_write); -} - -EXPORT_SYMBOL(down_write_nested); - -void up_read_non_owner(struct rw_semaphore *sem) -{ - __up_read(sem); -} - -EXPORT_SYMBOL(up_read_non_owner); - -#endif - - diff --git a/libdde_linux26/contrib/kernel/semaphore.c b/libdde_linux26/contrib/kernel/semaphore.c deleted file mode 100644 index 94a62c0d..00000000 --- a/libdde_linux26/contrib/kernel/semaphore.c +++ /dev/null @@ -1,263 +0,0 @@ -/* - * Copyright (c) 2008 Intel Corporation - * Author: Matthew Wilcox <willy@linux.intel.com> - * - * Distributed under the terms of the GNU GPL, version 2 - * - * This file implements counting semaphores. - * A counting semaphore may be acquired 'n' times before sleeping. - * See mutex.c for single-acquisition sleeping locks which enforce - * rules which allow code to be debugged more easily. - */ - -/* - * Some notes on the implementation: - * - * The spinlock controls access to the other members of the semaphore. - * down_trylock() and up() can be called from interrupt context, so we - * have to disable interrupts when taking the lock. It turns out various - * parts of the kernel expect to be able to use down() on a semaphore in - * interrupt context when they know it will succeed, so we have to use - * irqsave variants for down(), down_interruptible() and down_killable() - * too. - * - * The ->count variable represents how many more tasks can acquire this - * semaphore. If it's zero, there may be tasks waiting on the wait_list. - */ - -#include <linux/compiler.h> -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/sched.h> -#include <linux/semaphore.h> -#include <linux/spinlock.h> -#include <linux/ftrace.h> - -static noinline void __down(struct semaphore *sem); -static noinline int __down_interruptible(struct semaphore *sem); -static noinline int __down_killable(struct semaphore *sem); -static noinline int __down_timeout(struct semaphore *sem, long jiffies); -static noinline void __up(struct semaphore *sem); - -/** - * down - acquire the semaphore - * @sem: the semaphore to be acquired - * - * Acquires the semaphore. If no more tasks are allowed to acquire the - * semaphore, calling this function will put the task to sleep until the - * semaphore is released. - * - * Use of this function is deprecated, please use down_interruptible() or - * down_killable() instead. - */ -void down(struct semaphore *sem) -{ - unsigned long flags; - - spin_lock_irqsave(&sem->lock, flags); - if (likely(sem->count > 0)) - sem->count--; - else - __down(sem); - spin_unlock_irqrestore(&sem->lock, flags); -} -EXPORT_SYMBOL(down); - -/** - * down_interruptible - acquire the semaphore unless interrupted - * @sem: the semaphore to be acquired - * - * Attempts to acquire the semaphore. If no more tasks are allowed to - * acquire the semaphore, calling this function will put the task to sleep. - * If the sleep is interrupted by a signal, this function will return -EINTR. - * If the semaphore is successfully acquired, this function returns 0. - */ -int down_interruptible(struct semaphore *sem) -{ - unsigned long flags; - int result = 0; - - spin_lock_irqsave(&sem->lock, flags); - if (likely(sem->count > 0)) - sem->count--; - else - result = __down_interruptible(sem); - spin_unlock_irqrestore(&sem->lock, flags); - - return result; -} -EXPORT_SYMBOL(down_interruptible); - -/** - * down_killable - acquire the semaphore unless killed - * @sem: the semaphore to be acquired - * - * Attempts to acquire the semaphore. If no more tasks are allowed to - * acquire the semaphore, calling this function will put the task to sleep. - * If the sleep is interrupted by a fatal signal, this function will return - * -EINTR. If the semaphore is successfully acquired, this function returns - * 0. - */ -int down_killable(struct semaphore *sem) -{ - unsigned long flags; - int result = 0; - - spin_lock_irqsave(&sem->lock, flags); - if (likely(sem->count > 0)) - sem->count--; - else - result = __down_killable(sem); - spin_unlock_irqrestore(&sem->lock, flags); - - return result; -} -EXPORT_SYMBOL(down_killable); - -/** - * down_trylock - try to acquire the semaphore, without waiting - * @sem: the semaphore to be acquired - * - * Try to acquire the semaphore atomically. Returns 0 if the mutex has - * been acquired successfully or 1 if it it cannot be acquired. - * - * NOTE: This return value is inverted from both spin_trylock and - * mutex_trylock! Be careful about this when converting code. - * - * Unlike mutex_trylock, this function can be used from interrupt context, - * and the semaphore can be released by any task or interrupt. - */ -int down_trylock(struct semaphore *sem) -{ - unsigned long flags; - int count; - - spin_lock_irqsave(&sem->lock, flags); - count = sem->count - 1; - if (likely(count >= 0)) - sem->count = count; - spin_unlock_irqrestore(&sem->lock, flags); - - return (count < 0); -} -EXPORT_SYMBOL(down_trylock); - -/** - * down_timeout - acquire the semaphore within a specified time - * @sem: the semaphore to be acquired - * @jiffies: how long to wait before failing - * - * Attempts to acquire the semaphore. If no more tasks are allowed to - * acquire the semaphore, calling this function will put the task to sleep. - * If the semaphore is not released within the specified number of jiffies, - * this function returns -ETIME. It returns 0 if the semaphore was acquired. - */ -int down_timeout(struct semaphore *sem, long jiffies) -{ - unsigned long flags; - int result = 0; - - spin_lock_irqsave(&sem->lock, flags); - if (likely(sem->count > 0)) - sem->count--; - else - result = __down_timeout(sem, jiffies); - spin_unlock_irqrestore(&sem->lock, flags); - - return result; -} -EXPORT_SYMBOL(down_timeout); - -/** - * up - release the semaphore - * @sem: the semaphore to release - * - * Release the semaphore. Unlike mutexes, up() may be called from any - * context and even by tasks which have never called down(). - */ -void up(struct semaphore *sem) -{ - unsigned long flags; - - spin_lock_irqsave(&sem->lock, flags); - if (likely(list_empty(&sem->wait_list))) - sem->count++; - else - __up(sem); - spin_unlock_irqrestore(&sem->lock, flags); -} -EXPORT_SYMBOL(up); - -/* Functions for the contended case */ - -struct semaphore_waiter { - struct list_head list; - struct task_struct *task; - int up; -}; - -/* - * Because this function is inlined, the 'state' parameter will be - * constant, and thus optimised away by the compiler. Likewise the - * 'timeout' parameter for the cases without timeouts. - */ -static inline int __sched __down_common(struct semaphore *sem, long state, - long timeout) -{ - struct task_struct *task = current; - struct semaphore_waiter waiter; - - list_add_tail(&waiter.list, &sem->wait_list); - waiter.task = task; - waiter.up = 0; - - for (;;) { - if (signal_pending_state(state, task)) - goto interrupted; - if (timeout <= 0) - goto timed_out; - __set_task_state(task, state); - spin_unlock_irq(&sem->lock); - timeout = schedule_timeout(timeout); - spin_lock_irq(&sem->lock); - if (waiter.up) - return 0; - } - - timed_out: - list_del(&waiter.list); - return -ETIME; - - interrupted: - list_del(&waiter.list); - return -EINTR; -} - -static noinline void __sched __down(struct semaphore *sem) -{ - __down_common(sem, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT); -} - -static noinline int __sched __down_interruptible(struct semaphore *sem) -{ - return __down_common(sem, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT); -} - -static noinline int __sched __down_killable(struct semaphore *sem) -{ - return __down_common(sem, TASK_KILLABLE, MAX_SCHEDULE_TIMEOUT); -} - -static noinline int __sched __down_timeout(struct semaphore *sem, long jiffies) -{ - return __down_common(sem, TASK_UNINTERRUPTIBLE, jiffies); -} - -static noinline void __sched __up(struct semaphore *sem) -{ - struct semaphore_waiter *waiter = list_first_entry(&sem->wait_list, - struct semaphore_waiter, list); - list_del(&waiter->list); - waiter->up = 1; - wake_up_process(waiter->task); -} |