1 files changed, 0 insertions, 583 deletions
diff --git a/libdde-linux26/libdde_linux26/contrib/mm/swap.c b/libdde-linux26/libdde_linux26/contrib/mm/swap.c
deleted file mode 100644
index 8adb9feb..00000000
--- a/libdde-linux26/libdde_linux26/contrib/mm/swap.c
+++ /dev/null
@@ -1,583 +0,0 @@
-/*
- *  linux/mm/swap.c
- *
- *  Copyright (C) 1991, 1992, 1993, 1994  Linus Torvalds
- */
-
-/*
- * This file contains the default values for the operation of the
- * Linux VM subsystem. Fine-tuning documentation can be found in
- * Documentation/sysctl/vm.txt.
- * Started 18.12.91
- * Swap aging added 23.2.95, Stephen Tweedie.
- * Buffermem limits added 12.3.98, Rik van Riel.
- */
-
-#include <linux/mm.h>
-#include <linux/sched.h>
-#include <linux/kernel_stat.h>
-#include <linux/swap.h>
-#include <linux/mman.h>
-#include <linux/pagemap.h>
-#include <linux/pagevec.h>
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/mm_inline.h>
-#include <linux/buffer_head.h>	/* for try_to_release_page() */
-#include <linux/percpu_counter.h>
-#include <linux/percpu.h>
-#include <linux/cpu.h>
-#include <linux/notifier.h>
-#include <linux/backing-dev.h>
-#include <linux/memcontrol.h>
-
-#include "internal.h"
-
-/* How many pages do we try to swap or page in/out together? */
-int page_cluster;
-
-static DEFINE_PER_CPU(struct pagevec[NR_LRU_LISTS], lru_add_pvecs);
-static DEFINE_PER_CPU(struct pagevec, lru_rotate_pvecs);
-
-/*
- * This path almost never happens for VM activity - pages are normally
- * freed via pagevecs.  But it gets used by networking.
- */
-static void __page_cache_release(struct page *page)
-{
-	if (PageLRU(page)) {
-		unsigned long flags;
-		struct zone *zone = page_zone(page);
-
-		spin_lock_irqsave(&zone->lru_lock, flags);
-		VM_BUG_ON(!PageLRU(page));
-		__ClearPageLRU(page);
-		del_page_from_lru(zone, page);
-		spin_unlock_irqrestore(&zone->lru_lock, flags);
-	}
-	free_hot_page(page);
-}
-
-static void put_compound_page(struct page *page)
-{
-	page = compound_head(page);
-	if (put_page_testzero(page)) {
-		compound_page_dtor *dtor;
-
-		dtor = get_compound_page_dtor(page);
-		(*dtor)(page);
-	}
-}
-
-void put_page(struct page *page)
-{
-	if (unlikely(PageCompound(page)))
-		put_compound_page(page);
-	else if (put_page_testzero(page))
-		__page_cache_release(page);
-}
-EXPORT_SYMBOL(put_page);
-
-/**
- * put_pages_list() - release a list of pages
- * @pages: list of pages threaded on page->lru
- *
- * Release a list of pages which are strung together on page.lru.  Currently
- * used by read_cache_pages() and related error recovery code.
- */
-void put_pages_list(struct list_head *pages)
-{
-	while (!list_empty(pages)) {
-		struct page *victim;
-
-		victim = list_entry(pages->prev, struct page, lru);
-		list_del(&victim->lru);
-		page_cache_release(victim);
-	}
-}
-EXPORT_SYMBOL(put_pages_list);
-
-/*
- * pagevec_move_tail() must be called with IRQ disabled.
- * Otherwise this may cause nasty races.
- */
-static void pagevec_move_tail(struct pagevec *pvec)
-{
-	int i;
-	int pgmoved = 0;
-	struct zone *zone = NULL;
-
-	for (i = 0; i < pagevec_count(pvec); i++) {
-		struct page *page = pvec->pages[i];
-		struct zone *pagezone = page_zone(page);
-
-		if (pagezone != zone) {
-			if (zone)
-				spin_unlock(&zone->lru_lock);
-			zone = pagezone;
-			spin_lock(&zone->lru_lock);
-		}
-		if (PageLRU(page) && !PageActive(page) && !PageUnevictable(page)) {
-			int lru = page_is_file_cache(page);
-			list_move_tail(&page->lru, &zone->lru[lru].list);
-			pgmoved++;
-		}
-	}
-	if (zone)
-		spin_unlock(&zone->lru_lock);
-	__count_vm_events(PGROTATED, pgmoved);
-	release_pages(pvec->pages, pvec->nr, pvec->cold);
-	pagevec_reinit(pvec);
-}
-
-/*
- * Writeback is about to end against a page which has been marked for immediate
- * reclaim.  If it still appears to be reclaimable, move it to the tail of the
- * inactive list.
- */
-void  rotate_reclaimable_page(struct page *page)
-{
-	if (!PageLocked(page) && !PageDirty(page) && !PageActive(page) &&
-	    !PageUnevictable(page) && PageLRU(page)) {
-		struct pagevec *pvec;
-		unsigned long flags;
-
-		page_cache_get(page);
-		local_irq_save(flags);
-		pvec = &__get_cpu_var(lru_rotate_pvecs);
-		if (!pagevec_add(pvec, page))
-			pagevec_move_tail(pvec);
-		local_irq_restore(flags);
-	}
-}
-
-static void update_page_reclaim_stat(struct zone *zone, struct page *page,
-				     int file, int rotated)
-{
-	struct zone_reclaim_stat *reclaim_stat = &zone->reclaim_stat;
-	struct zone_reclaim_stat *memcg_reclaim_stat;
-
-	memcg_reclaim_stat = mem_cgroup_get_reclaim_stat_from_page(page);
-
-	reclaim_stat->recent_scanned[file]++;
-	if (rotated)
-		reclaim_stat->recent_rotated[file]++;
-
-	if (!memcg_reclaim_stat)
-		return;
-
-	memcg_reclaim_stat->recent_scanned[file]++;
-	if (rotated)
-		memcg_reclaim_stat->recent_rotated[file]++;
-}
-
-/*
- * FIXME: speed this up?
- */
-void activate_page(struct page *page)
-{
-	struct zone *zone = page_zone(page);
-
-	spin_lock_irq(&zone->lru_lock);
-	if (PageLRU(page) && !PageActive(page) && !PageUnevictable(page)) {
-		int file = page_is_file_cache(page);
-		int lru = LRU_BASE + file;
-		del_page_from_lru_list(zone, page, lru);
-
-		SetPageActive(page);
-		lru += LRU_ACTIVE;
-		add_page_to_lru_list(zone, page, lru);
-		__count_vm_event(PGACTIVATE);
-
-		update_page_reclaim_stat(zone, page, !!file, 1);
-	}
-	spin_unlock_irq(&zone->lru_lock);
-}
-
-/*
- * Mark a page as having seen activity.
- *
- * inactive,unreferenced	->	inactive,referenced
- * inactive,referenced		->	active,unreferenced
- * active,unreferenced		->	active,referenced
- */
-void mark_page_accessed(struct page *page)
-{
-	if (!PageActive(page) && !PageUnevictable(page) &&
-			PageReferenced(page) && PageLRU(page)) {
-		activate_page(page);
-		ClearPageReferenced(page);
-	} else if (!PageReferenced(page)) {
-		SetPageReferenced(page);
-	}
-}
-
-EXPORT_SYMBOL(mark_page_accessed);
-
-void __lru_cache_add(struct page *page, enum lru_list lru)
-{
-	struct pagevec *pvec = &get_cpu_var(lru_add_pvecs)[lru];
-
-	page_cache_get(page);
-	if (!pagevec_add(pvec, page))
-		____pagevec_lru_add(pvec, lru);
-	put_cpu_var(lru_add_pvecs);
-}
-
-/**
- * lru_cache_add_lru - add a page to a page list
- * @page: the page to be added to the LRU.
- * @lru: the LRU list to which the page is added.
- */
-void lru_cache_add_lru(struct page *page, enum lru_list lru)
-{
-	if (PageActive(page)) {
-		VM_BUG_ON(PageUnevictable(page));
-		ClearPageActive(page);
-	} else if (PageUnevictable(page)) {
-		VM_BUG_ON(PageActive(page));
-		ClearPageUnevictable(page);
-	}
-
-	VM_BUG_ON(PageLRU(page) || PageActive(page) || PageUnevictable(page));
-	__lru_cache_add(page, lru);
-}
-
-/**
- * add_page_to_unevictable_list - add a page to the unevictable list
- * @page:  the page to be added to the unevictable list
- *
- * Add page directly to its zone's unevictable list.  To avoid races with
- * tasks that might be making the page evictable, through eg. munlock,
- * munmap or exit, while it's not on the lru, we want to add the page
- * while it's locked or otherwise "invisible" to other tasks.  This is
- * difficult to do when using the pagevec cache, so bypass that.
- */
-void add_page_to_unevictable_list(struct page *page)
-{
-	struct zone *zone = page_zone(page);
-
-	spin_lock_irq(&zone->lru_lock);
-	SetPageUnevictable(page);
-	SetPageLRU(page);
-	add_page_to_lru_list(zone, page, LRU_UNEVICTABLE);
-	spin_unlock_irq(&zone->lru_lock);
-}
-
-/*
- * Drain pages out of the cpu's pagevecs.
- * Either "cpu" is the current CPU, and preemption has already been
- * disabled; or "cpu" is being hot-unplugged, and is already dead.
- */
-static void drain_cpu_pagevecs(int cpu)
-{
-	struct pagevec *pvecs = per_cpu(lru_add_pvecs, cpu);
-	struct pagevec *pvec;
-	int lru;
-
-	for_each_lru(lru) {
-		pvec = &pvecs[lru - LRU_BASE];
-		if (pagevec_count(pvec))
-			____pagevec_lru_add(pvec, lru);
-	}
-
-	pvec = &per_cpu(lru_rotate_pvecs, cpu);
-	if (pagevec_count(pvec)) {
-		unsigned long flags;
-
-		/* No harm done if a racing interrupt already did this */
-		local_irq_save(flags);
-		pagevec_move_tail(pvec);
-		local_irq_restore(flags);
-	}
-}
-
-void lru_add_drain(void)
-{
-	drain_cpu_pagevecs(get_cpu());
-	put_cpu();
-}
-
-static void lru_add_drain_per_cpu(struct work_struct *dummy)
-{
-	lru_add_drain();
-}
-
-/*
- * Returns 0 for success
- */
-int lru_add_drain_all(void)
-{
-	return schedule_on_each_cpu(lru_add_drain_per_cpu);
-}
-
-/*
- * Batched page_cache_release().  Decrement the reference count on all the
- * passed pages.  If it fell to zero then remove the page from the LRU and
- * free it.
- *
- * Avoid taking zone->lru_lock if possible, but if it is taken, retain it
- * for the remainder of the operation.
- *
- * The locking in this function is against shrink_inactive_list(): we recheck
- * the page count inside the lock to see whether shrink_inactive_list()
- * grabbed the page via the LRU.  If it did, give up: shrink_inactive_list()
- * will free it.
- */
-void release_pages(struct page **pages, int nr, int cold)
-{
-	int i;
-	struct pagevec pages_to_free;
-	struct zone *zone = NULL;
-	unsigned long uninitialized_var(flags);
-
-	pagevec_init(&pages_to_free, cold);
-	for (i = 0; i < nr; i++) {
-		struct page *page = pages[i];
-
-		if (unlikely(PageCompound(page))) {
-			if (zone) {
-				spin_unlock_irqrestore(&zone->lru_lock, flags);
-				zone = NULL;
-			}
-			put_compound_page(page);
-			continue;
-		}
-
-		if (!put_page_testzero(page))
-			continue;
-
-		if (PageLRU(page)) {
-			struct zone *pagezone = page_zone(page);
-
-			if (pagezone != zone) {
-				if (zone)
-					spin_unlock_irqrestore(&zone->lru_lock,
-									flags);
-				zone = pagezone;
-				spin_lock_irqsave(&zone->lru_lock, flags);
-			}
-			VM_BUG_ON(!PageLRU(page));
-			__ClearPageLRU(page);
-			del_page_from_lru(zone, page);
-		}
-
-		if (!pagevec_add(&pages_to_free, page)) {
-			if (zone) {
-				spin_unlock_irqrestore(&zone->lru_lock, flags);
-				zone = NULL;
-			}
-			__pagevec_free(&pages_to_free);
-			pagevec_reinit(&pages_to_free);
-  		}
-	}
-	if (zone)
-		spin_unlock_irqrestore(&zone->lru_lock, flags);
-
-	pagevec_free(&pages_to_free);
-}
-
-/*
- * The pages which we're about to release may be in the deferred lru-addition
- * queues.  That would prevent them from really being freed right now.  That's
- * OK from a correctness point of view but is inefficient - those pages may be
- * cache-warm and we want to give them back to the page allocator ASAP.
- *
- * So __pagevec_release() will drain those queues here.  __pagevec_lru_add()
- * and __pagevec_lru_add_active() call release_pages() directly to avoid
- * mutual recursion.
- */
-void __pagevec_release(struct pagevec *pvec)
-{
-	lru_add_drain();
-	release_pages(pvec->pages, pagevec_count(pvec), pvec->cold);
-	pagevec_reinit(pvec);
-}
-
-EXPORT_SYMBOL(__pagevec_release);
-
-/*
- * Add the passed pages to the LRU, then drop the caller's refcount
- * on them.  Reinitialises the caller's pagevec.
- */
-void ____pagevec_lru_add(struct pagevec *pvec, enum lru_list lru)
-{
-	int i;
-	struct zone *zone = NULL;
-
-	VM_BUG_ON(is_unevictable_lru(lru));
-
-	for (i = 0; i < pagevec_count(pvec); i++) {
-		struct page *page = pvec->pages[i];
-		struct zone *pagezone = page_zone(page);
-		int file;
-		int active;
-
-		if (pagezone != zone) {
-			if (zone)
-				spin_unlock_irq(&zone->lru_lock);
-			zone = pagezone;
-			spin_lock_irq(&zone->lru_lock);
-		}
-		VM_BUG_ON(PageActive(page));
-		VM_BUG_ON(PageUnevictable(page));
-		VM_BUG_ON(PageLRU(page));
-		SetPageLRU(page);
-		active = is_active_lru(lru);
-		file = is_file_lru(lru);
-		if (active)
-			SetPageActive(page);
-		update_page_reclaim_stat(zone, page, file, active);
-		add_page_to_lru_list(zone, page, lru);
-	}
-	if (zone)
-		spin_unlock_irq(&zone->lru_lock);
-	release_pages(pvec->pages, pvec->nr, pvec->cold);
-	pagevec_reinit(pvec);
-}
-
-EXPORT_SYMBOL(____pagevec_lru_add);
-
-/*
- * Try to drop buffers from the pages in a pagevec
- */
-void pagevec_strip(struct pagevec *pvec)
-{
-	int i;
-
-	for (i = 0; i < pagevec_count(pvec); i++) {
-		struct page *page = pvec->pages[i];
-
-		if (PagePrivate(page) && trylock_page(page)) {
-			if (PagePrivate(page))
-				try_to_release_page(page, 0);
-			unlock_page(page);
-		}
-	}
-}
-
-/**
- * pagevec_swap_free - try to free swap space from the pages in a pagevec
- * @pvec: pagevec with swapcache pages to free the swap space of
- *
- * The caller needs to hold an extra reference to each page and
- * not hold the page lock on the pages.  This function uses a
- * trylock on the page lock so it may not always free the swap
- * space associated with a page.
- */
-void pagevec_swap_free(struct pagevec *pvec)
-{
-	int i;
-
-	for (i = 0; i < pagevec_count(pvec); i++) {
-		struct page *page = pvec->pages[i];
-
-		if (PageSwapCache(page) && trylock_page(page)) {
-			try_to_free_swap(page);
-			unlock_page(page);
-		}
-	}
-}
-
-/**
- * pagevec_lookup - gang pagecache lookup
- * @pvec:	Where the resulting pages are placed
- * @mapping:	The address_space to search
- * @start:	The starting page index
- * @nr_pages:	The maximum number of pages
- *
- * pagevec_lookup() will search for and return a group of up to @nr_pages pages
- * in the mapping.  The pages are placed in @pvec.  pagevec_lookup() takes a
- * reference against the pages in @pvec.
- *
- * The search returns a group of mapping-contiguous pages with ascending
- * indexes.  There may be holes in the indices due to not-present pages.
- *
- * pagevec_lookup() returns the number of pages which were found.
- */
-unsigned pagevec_lookup(struct pagevec *pvec, struct address_space *mapping,
-		pgoff_t start, unsigned nr_pages)
-{
-	pvec->nr = find_get_pages(mapping, start, nr_pages, pvec->pages);
-	return pagevec_count(pvec);
-}
-
-EXPORT_SYMBOL(pagevec_lookup);
-
-unsigned pagevec_lookup_tag(struct pagevec *pvec, struct address_space *mapping,
-		pgoff_t *index, int tag, unsigned nr_pages)
-{
-	pvec->nr = find_get_pages_tag(mapping, index, tag,
-					nr_pages, pvec->pages);
-	return pagevec_count(pvec);
-}
-
-EXPORT_SYMBOL(pagevec_lookup_tag);
-
-#ifdef CONFIG_SMP
-/*
- * We tolerate a little inaccuracy to avoid ping-ponging the counter between
- * CPUs
- */
-#define ACCT_THRESHOLD	max(16, NR_CPUS * 2)
-
-static DEFINE_PER_CPU(long, committed_space);
-
-void vm_acct_memory(long pages)
-{
-	long *local;
-
-	preempt_disable();
-	local = &__get_cpu_var(committed_space);
-	*local += pages;
-	if (*local > ACCT_THRESHOLD || *local < -ACCT_THRESHOLD) {
-		atomic_long_add(*local, &vm_committed_space);
-		*local = 0;
-	}
-	preempt_enable();
-}
-
-#ifdef CONFIG_HOTPLUG_CPU
-
-/* Drop the CPU's cached committed space back into the central pool. */
-static int cpu_swap_callback(struct notifier_block *nfb,
-			     unsigned long action,
-			     void *hcpu)
-{
-	long *committed;
-
-	committed = &per_cpu(committed_space, (long)hcpu);
-	if (action == CPU_DEAD || action == CPU_DEAD_FROZEN) {
-		atomic_long_add(*committed, &vm_committed_space);
-		*committed = 0;
-		drain_cpu_pagevecs((long)hcpu);
-	}
-	return NOTIFY_OK;
-}
-#endif /* CONFIG_HOTPLUG_CPU */
-#endif /* CONFIG_SMP */
-
-/*
- * Perform any setup for the swap system
- */
-void __init swap_setup(void)
-{
-	unsigned long megs = num_physpages >> (20 - PAGE_SHIFT);
-
-#ifdef CONFIG_SWAP
-	bdi_init(swapper_space.backing_dev_info);
-#endif
-
-	/* Use a smaller cluster for small-memory machines */
-	if (megs < 16)
-		page_cluster = 2;
-	else
-		page_cluster = 3;
-	/*
-	 * Right now other parts of the system means that we
-	 * _really_ don't want to cluster much more
-	 */
-#ifdef CONFIG_HOTPLUG_CPU
-	hotcpu_notifier(cpu_swap_callback, 0);
-#endif
-}