diff options
Diffstat (limited to 'ANDROID_3.4.5/include/linux/swapops.h')
| -rw-r--r-- | ANDROID_3.4.5/include/linux/swapops.h | 197 |
1 files changed, 0 insertions, 197 deletions
diff --git a/ANDROID_3.4.5/include/linux/swapops.h b/ANDROID_3.4.5/include/linux/swapops.h deleted file mode 100644 index 47ead515..00000000 --- a/ANDROID_3.4.5/include/linux/swapops.h +++ /dev/null @@ -1,197 +0,0 @@ -#ifndef _LINUX_SWAPOPS_H -#define _LINUX_SWAPOPS_H - -#include <linux/radix-tree.h> -#include <linux/bug.h> - -/* - * swapcache pages are stored in the swapper_space radix tree. We want to - * get good packing density in that tree, so the index should be dense in - * the low-order bits. - * - * We arrange the `type' and `offset' fields so that `type' is at the seven - * high-order bits of the swp_entry_t and `offset' is right-aligned in the - * remaining bits. Although `type' itself needs only five bits, we allow for - * shmem/tmpfs to shift it all up a further two bits: see swp_to_radix_entry(). - * - * swp_entry_t's are *never* stored anywhere in their arch-dependent format. - */ -#define SWP_TYPE_SHIFT(e) ((sizeof(e.val) * 8) - \ - (MAX_SWAPFILES_SHIFT + RADIX_TREE_EXCEPTIONAL_SHIFT)) -#define SWP_OFFSET_MASK(e) ((1UL << SWP_TYPE_SHIFT(e)) - 1) - -/* - * Store a type+offset into a swp_entry_t in an arch-independent format - */ -static inline swp_entry_t swp_entry(unsigned long type, pgoff_t offset) -{ - swp_entry_t ret; - - ret.val = (type << SWP_TYPE_SHIFT(ret)) | - (offset & SWP_OFFSET_MASK(ret)); - return ret; -} - -/* - * Extract the `type' field from a swp_entry_t. The swp_entry_t is in - * arch-independent format - */ -static inline unsigned swp_type(swp_entry_t entry) -{ - return (entry.val >> SWP_TYPE_SHIFT(entry)); -} - -/* - * Extract the `offset' field from a swp_entry_t. The swp_entry_t is in - * arch-independent format - */ -static inline pgoff_t swp_offset(swp_entry_t entry) -{ - return entry.val & SWP_OFFSET_MASK(entry); -} - -#ifdef CONFIG_MMU -/* check whether a pte points to a swap entry */ -static inline int is_swap_pte(pte_t pte) -{ - return !pte_none(pte) && !pte_present(pte) && !pte_file(pte); -} -#endif - -/* - * Convert the arch-dependent pte representation of a swp_entry_t into an - * arch-independent swp_entry_t. - */ -static inline swp_entry_t pte_to_swp_entry(pte_t pte) -{ - swp_entry_t arch_entry; - - BUG_ON(pte_file(pte)); - arch_entry = __pte_to_swp_entry(pte); - return swp_entry(__swp_type(arch_entry), __swp_offset(arch_entry)); -} - -/* - * Convert the arch-independent representation of a swp_entry_t into the - * arch-dependent pte representation. - */ -static inline pte_t swp_entry_to_pte(swp_entry_t entry) -{ - swp_entry_t arch_entry; - - arch_entry = __swp_entry(swp_type(entry), swp_offset(entry)); - BUG_ON(pte_file(__swp_entry_to_pte(arch_entry))); - return __swp_entry_to_pte(arch_entry); -} - -static inline swp_entry_t radix_to_swp_entry(void *arg) -{ - swp_entry_t entry; - - entry.val = (unsigned long)arg >> RADIX_TREE_EXCEPTIONAL_SHIFT; - return entry; -} - -static inline void *swp_to_radix_entry(swp_entry_t entry) -{ - unsigned long value; - - value = entry.val << RADIX_TREE_EXCEPTIONAL_SHIFT; - return (void *)(value | RADIX_TREE_EXCEPTIONAL_ENTRY); -} - -#ifdef CONFIG_MIGRATION -static inline swp_entry_t make_migration_entry(struct page *page, int write) -{ - BUG_ON(!PageLocked(page)); - return swp_entry(write ? SWP_MIGRATION_WRITE : SWP_MIGRATION_READ, - page_to_pfn(page)); -} - -static inline int is_migration_entry(swp_entry_t entry) -{ - return unlikely(swp_type(entry) == SWP_MIGRATION_READ || - swp_type(entry) == SWP_MIGRATION_WRITE); -} - -static inline int is_write_migration_entry(swp_entry_t entry) -{ - return unlikely(swp_type(entry) == SWP_MIGRATION_WRITE); -} - -static inline struct page *migration_entry_to_page(swp_entry_t entry) -{ - struct page *p = pfn_to_page(swp_offset(entry)); - /* - * Any use of migration entries may only occur while the - * corresponding page is locked - */ - BUG_ON(!PageLocked(p)); - return p; -} - -static inline void make_migration_entry_read(swp_entry_t *entry) -{ - *entry = swp_entry(SWP_MIGRATION_READ, swp_offset(*entry)); -} - -extern void migration_entry_wait(struct mm_struct *mm, pmd_t *pmd, - unsigned long address); -#else - -#define make_migration_entry(page, write) swp_entry(0, 0) -static inline int is_migration_entry(swp_entry_t swp) -{ - return 0; -} -#define migration_entry_to_page(swp) NULL -static inline void make_migration_entry_read(swp_entry_t *entryp) { } -static inline void migration_entry_wait(struct mm_struct *mm, pmd_t *pmd, - unsigned long address) { } -static inline int is_write_migration_entry(swp_entry_t entry) -{ - return 0; -} - -#endif - -#ifdef CONFIG_MEMORY_FAILURE -/* - * Support for hardware poisoned pages - */ -static inline swp_entry_t make_hwpoison_entry(struct page *page) -{ - BUG_ON(!PageLocked(page)); - return swp_entry(SWP_HWPOISON, page_to_pfn(page)); -} - -static inline int is_hwpoison_entry(swp_entry_t entry) -{ - return swp_type(entry) == SWP_HWPOISON; -} -#else - -static inline swp_entry_t make_hwpoison_entry(struct page *page) -{ - return swp_entry(0, 0); -} - -static inline int is_hwpoison_entry(swp_entry_t swp) -{ - return 0; -} -#endif - -#if defined(CONFIG_MEMORY_FAILURE) || defined(CONFIG_MIGRATION) -static inline int non_swap_entry(swp_entry_t entry) -{ - return swp_type(entry) >= MAX_SWAPFILES; -} -#else -static inline int non_swap_entry(swp_entry_t entry) -{ - return 0; -} -#endif - -#endif /* _LINUX_SWAPOPS_H */ |