diff options
| -rw-r--r-- | include/asm-generic/4level-fixup.h | 11 | ||||
| -rw-r--r-- | include/linux/mm.h | 38 | ||||
| -rw-r--r-- | mm/memory.c | 95 | ||||
| -rw-r--r-- | mm/mremap.c | 7 |
4 files changed, 62 insertions, 89 deletions
diff --git a/include/asm-generic/4level-fixup.h b/include/asm-generic/4level-fixup.h index c20ec257ecc..68c6fea994d 100644 --- a/include/asm-generic/4level-fixup.h +++ b/include/asm-generic/4level-fixup.h @@ -10,14 +10,9 @@ #define pud_t pgd_t -#define pmd_alloc(mm, pud, address) \ -({ pmd_t *ret; \ - if (pgd_none(*pud)) \ - ret = __pmd_alloc(mm, pud, address); \ - else \ - ret = pmd_offset(pud, address); \ - ret; \ -}) +#define pmd_alloc(mm, pud, address) \ + ((unlikely(pgd_none(*(pud))) && __pmd_alloc(mm, pud, address))? \ + NULL: pmd_offset(pud, address)) #define pud_alloc(mm, pgd, address) (pgd) #define pud_offset(pgd, start) (pgd) diff --git a/include/linux/mm.h b/include/linux/mm.h index b9fa82b96d9..22c2d6922c0 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -704,10 +704,6 @@ static inline void unmap_shared_mapping_range(struct address_space *mapping, } extern int vmtruncate(struct inode * inode, loff_t offset); -extern pud_t *FASTCALL(__pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address)); -extern pmd_t *FASTCALL(__pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address)); -extern pte_t *FASTCALL(pte_alloc_kernel(pmd_t *pmd, unsigned long address)); -extern pte_t *FASTCALL(pte_alloc_map(struct mm_struct *mm, pmd_t *pmd, unsigned long address)); extern int install_page(struct mm_struct *mm, struct vm_area_struct *vma, unsigned long addr, struct page *page, pgprot_t prot); extern int install_file_pte(struct mm_struct *mm, struct vm_area_struct *vma, unsigned long addr, unsigned long pgoff, pgprot_t prot); extern int __handle_mm_fault(struct mm_struct *mm,struct vm_area_struct *vma, unsigned long address, int write_access); @@ -760,32 +756,36 @@ struct shrinker; extern struct shrinker *set_shrinker(int, shrinker_t); extern void remove_shrinker(struct shrinker *shrinker); -/* - * On a two-level or three-level page table, this ends up being trivial. Thus - * the inlining and the symmetry break with pte_alloc_map() that does all - * of this out-of-line. - */ +int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address); +int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address); +int __pte_alloc(struct mm_struct *mm, pmd_t *pmd, unsigned long address); +int __pte_alloc_kernel(pmd_t *pmd, unsigned long address); + /* * The following ifdef needed to get the 4level-fixup.h header to work. * Remove it when 4level-fixup.h has been removed. */ -#ifdef CONFIG_MMU -#ifndef __ARCH_HAS_4LEVEL_HACK +#if defined(CONFIG_MMU) && !defined(__ARCH_HAS_4LEVEL_HACK) static inline pud_t *pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address) { - if (pgd_none(*pgd)) - return __pud_alloc(mm, pgd, address); - return pud_offset(pgd, address); + return (unlikely(pgd_none(*pgd)) && __pud_alloc(mm, pgd, address))? + NULL: pud_offset(pgd, address); } static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address) { - if (pud_none(*pud)) - return __pmd_alloc(mm, pud, address); - return pmd_offset(pud, address); + return (unlikely(pud_none(*pud)) && __pmd_alloc(mm, pud, address))? + NULL: pmd_offset(pud, address); } -#endif -#endif /* CONFIG_MMU */ +#endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */ + +#define pte_alloc_map(mm, pmd, address) \ + ((unlikely(!pmd_present(*(pmd))) && __pte_alloc(mm, pmd, address))? \ + NULL: pte_offset_map(pmd, address)) + +#define pte_alloc_kernel(pmd, address) \ + ((unlikely(!pmd_present(*(pmd))) && __pte_alloc_kernel(pmd, address))? \ + NULL: pte_offset_kernel(pmd, address)) extern void free_area_init(unsigned long * zones_size); extern void free_area_init_node(int nid, pg_data_t *pgdat, diff --git a/mm/memory.c b/mm/memory.c index 95a4553c75f..4bdd1186b43 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -280,50 +280,39 @@ void free_pgtables(struct mmu_gather **tlb, struct vm_area_struct *vma, } } -pte_t fastcall *pte_alloc_map(struct mm_struct *mm, pmd_t *pmd, - unsigned long address) +int __pte_alloc(struct mm_struct *mm, pmd_t *pmd, unsigned long address) { - if (!pmd_present(*pmd)) { - struct page *new; + struct page *new; - spin_unlock(&mm->page_table_lock); - new = pte_alloc_one(mm, address); - spin_lock(&mm->page_table_lock); - if (!new) - return NULL; - /* - * Because we dropped the lock, we should re-check the - * entry, as somebody else could have populated it.. - */ - if (pmd_present(*pmd)) { - pte_free(new); - goto out; - } + spin_unlock(&mm->page_table_lock); + new = pte_alloc_one(mm, address); + spin_lock(&mm->page_table_lock); + if (!new) + return -ENOMEM; + + if (pmd_present(*pmd)) /* Another has populated it */ + pte_free(new); + else { mm->nr_ptes++; inc_page_state(nr_page_table_pages); pmd_populate(mm, pmd, new); } -out: - return pte_offset_map(pmd, address); + return 0; } -pte_t fastcall * pte_alloc_kernel(pmd_t *pmd, unsigned long address) +int __pte_alloc_kernel(pmd_t *pmd, unsigned long address) { - if (!pmd_present(*pmd)) { - pte_t *new; - - new = pte_alloc_one_kernel(&init_mm, address); - if (!new) - return NULL; - - spin_lock(&init_mm.page_table_lock); - if (pmd_present(*pmd)) - pte_free_kernel(new); - else - pmd_populate_kernel(&init_mm, pmd, new); - spin_unlock(&init_mm.page_table_lock); - } - return pte_offset_kernel(pmd, address); + pte_t *new = pte_alloc_one_kernel(&init_mm, address); + if (!new) + return -ENOMEM; + + spin_lock(&init_mm.page_table_lock); + if (pmd_present(*pmd)) /* Another has populated it */ + pte_free_kernel(new); + else + pmd_populate_kernel(&init_mm, pmd, new); + spin_unlock(&init_mm.page_table_lock); + return 0; } static inline void add_mm_rss(struct mm_struct *mm, int file_rss, int anon_rss) @@ -2093,7 +2082,7 @@ int __handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma, * Allocate page upper directory. * We've already handled the fast-path in-line. */ -pud_t fastcall *__pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address) +int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address) { pud_t *new; @@ -2103,19 +2092,17 @@ pud_t fastcall *__pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long addr if (!new) { if (mm != &init_mm) /* Temporary bridging hack */ spin_lock(&mm->page_table_lock); - return NULL; + return -ENOMEM; } spin_lock(&mm->page_table_lock); - if (pgd_present(*pgd)) { + if (pgd_present(*pgd)) /* Another has populated it */ pud_free(new); - goto out; - } - pgd_populate(mm, pgd, new); - out: + else + pgd_populate(mm, pgd, new); if (mm == &init_mm) /* Temporary bridging hack */ spin_unlock(&mm->page_table_lock); - return pud_offset(pgd, address); + return 0; } #endif /* __PAGETABLE_PUD_FOLDED */ @@ -2124,7 +2111,7 @@ pud_t fastcall *__pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long addr * Allocate page middle directory. * We've already handled the fast-path in-line. */ -pmd_t fastcall *__pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address) +int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address) { pmd_t *new; @@ -2134,28 +2121,24 @@ pmd_t fastcall *__pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long addr if (!new) { if (mm != &init_mm) /* Temporary bridging hack */ spin_lock(&mm->page_table_lock); - return NULL; + return -ENOMEM; } spin_lock(&mm->page_table_lock); #ifndef __ARCH_HAS_4LEVEL_HACK - if (pud_present(*pud)) { + if (pud_present(*pud)) /* Another has populated it */ pmd_free(new); - goto out; - } - pud_populate(mm, pud, new); + else + pud_populate(mm, pud, new); #else - if (pgd_present(*pud)) { + if (pgd_present(*pud)) /* Another has populated it */ pmd_free(new); - goto out; - } - pgd_populate(mm, pud, new); + else + pgd_populate(mm, pud, new); #endif /* __ARCH_HAS_4LEVEL_HACK */ - - out: if (mm == &init_mm) /* Temporary bridging hack */ spin_unlock(&mm->page_table_lock); - return pmd_offset(pud, address); + return 0; } #endif /* __PAGETABLE_PMD_FOLDED */ diff --git a/mm/mremap.c b/mm/mremap.c index ccf45647702..616facc3d28 100644 --- a/mm/mremap.c +++ b/mm/mremap.c @@ -51,7 +51,6 @@ static pmd_t *alloc_new_pmd(struct mm_struct *mm, unsigned long addr) pgd_t *pgd; pud_t *pud; pmd_t *pmd = NULL; - pte_t *pte; /* * We do need page_table_lock: because allocators expect that. @@ -66,12 +65,8 @@ static pmd_t *alloc_new_pmd(struct mm_struct *mm, unsigned long addr) if (!pmd) goto out; - pte = pte_alloc_map(mm, pmd, addr); - if (!pte) { + if (!pmd_present(*pmd) && __pte_alloc(mm, pmd, addr)) pmd = NULL; - goto out; - } - pte_unmap(pte); out: spin_unlock(&mm->page_table_lock); return pmd; |