From 8a6d48c0542876eb3acfc0970c0ab7872db08d5f Mon Sep 17 00:00:00 2001 From: Zheng Da Date: Sun, 6 Dec 2009 05:26:23 +0100 Subject: check in the original version of dde linux26. --- libdde_linux26/contrib/include/linux/rmap.h | 146 ++++++++++++++++++++++++++++ 1 file changed, 146 insertions(+) create mode 100644 libdde_linux26/contrib/include/linux/rmap.h (limited to 'libdde_linux26/contrib/include/linux/rmap.h') diff --git a/libdde_linux26/contrib/include/linux/rmap.h b/libdde_linux26/contrib/include/linux/rmap.h new file mode 100644 index 00000000..b35bc0e1 --- /dev/null +++ b/libdde_linux26/contrib/include/linux/rmap.h @@ -0,0 +1,146 @@ +#ifndef _LINUX_RMAP_H +#define _LINUX_RMAP_H +/* + * Declarations for Reverse Mapping functions in mm/rmap.c + */ + +#include +#include +#include +#include +#include + +/* + * The anon_vma heads a list of private "related" vmas, to scan if + * an anonymous page pointing to this anon_vma needs to be unmapped: + * the vmas on the list will be related by forking, or by splitting. + * + * Since vmas come and go as they are split and merged (particularly + * in mprotect), the mapping field of an anonymous page cannot point + * directly to a vma: instead it points to an anon_vma, on whose list + * the related vmas can be easily linked or unlinked. + * + * After unlinking the last vma on the list, we must garbage collect + * the anon_vma object itself: we're guaranteed no page can be + * pointing to this anon_vma once its vma list is empty. + */ +struct anon_vma { + spinlock_t lock; /* Serialize access to vma list */ + /* + * NOTE: the LSB of the head.next is set by + * mm_take_all_locks() _after_ taking the above lock. So the + * head must only be read/written after taking the above lock + * to be sure to see a valid next pointer. The LSB bit itself + * is serialized by a system wide lock only visible to + * mm_take_all_locks() (mm_all_locks_mutex). + */ + struct list_head head; /* List of private "related" vmas */ +}; + +#ifdef CONFIG_MMU + +static inline void anon_vma_lock(struct vm_area_struct *vma) +{ + struct anon_vma *anon_vma = vma->anon_vma; + if (anon_vma) + spin_lock(&anon_vma->lock); +} + +static inline void anon_vma_unlock(struct vm_area_struct *vma) +{ + struct anon_vma *anon_vma = vma->anon_vma; + if (anon_vma) + spin_unlock(&anon_vma->lock); +} + +/* + * anon_vma helper functions. + */ +void anon_vma_init(void); /* create anon_vma_cachep */ +int anon_vma_prepare(struct vm_area_struct *); +void __anon_vma_merge(struct vm_area_struct *, struct vm_area_struct *); +void anon_vma_unlink(struct vm_area_struct *); +void anon_vma_link(struct vm_area_struct *); +void __anon_vma_link(struct vm_area_struct *); + +/* + * rmap interfaces called when adding or removing pte of page + */ +void page_add_anon_rmap(struct page *, struct vm_area_struct *, unsigned long); +void page_add_new_anon_rmap(struct page *, struct vm_area_struct *, unsigned long); +void page_add_file_rmap(struct page *); +void page_remove_rmap(struct page *); + +#ifdef CONFIG_DEBUG_VM +void page_dup_rmap(struct page *page, struct vm_area_struct *vma, unsigned long address); +#else +static inline void page_dup_rmap(struct page *page, struct vm_area_struct *vma, unsigned long address) +{ + atomic_inc(&page->_mapcount); +} +#endif + +/* + * Called from mm/vmscan.c to handle paging out + */ +int page_referenced(struct page *, int is_locked, struct mem_cgroup *cnt); +int try_to_unmap(struct page *, int ignore_refs); + +/* + * Called from mm/filemap_xip.c to unmap empty zero page + */ +pte_t *page_check_address(struct page *, struct mm_struct *, + unsigned long, spinlock_t **, int); + +/* + * Used by swapoff to help locate where page is expected in vma. + */ +unsigned long page_address_in_vma(struct page *, struct vm_area_struct *); + +/* + * Cleans the PTEs of shared mappings. + * (and since clean PTEs should also be readonly, write protects them too) + * + * returns the number of cleaned PTEs. + */ +int page_mkclean(struct page *); + +#ifdef CONFIG_UNEVICTABLE_LRU +/* + * called in munlock()/munmap() path to check for other vmas holding + * the page mlocked. + */ +int try_to_munlock(struct page *); +#else +static inline int try_to_munlock(struct page *page) +{ + return 0; /* a.k.a. SWAP_SUCCESS */ +} +#endif + +#else /* !CONFIG_MMU */ + +#define anon_vma_init() do {} while (0) +#define anon_vma_prepare(vma) (0) +#define anon_vma_link(vma) do {} while (0) + +#define page_referenced(page,l,cnt) TestClearPageReferenced(page) +#define try_to_unmap(page, refs) SWAP_FAIL + +static inline int page_mkclean(struct page *page) +{ + return 0; +} + + +#endif /* CONFIG_MMU */ + +/* + * Return values of try_to_unmap + */ +#define SWAP_SUCCESS 0 +#define SWAP_AGAIN 1 +#define SWAP_FAIL 2 +#define SWAP_MLOCK 3 + +#endif /* _LINUX_RMAP_H */ -- cgit v1.2.3