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| author | Kirill A. Shutemov <kirill.shutemov@linux.intel.com> | 2013-11-14 23:31:50 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-11-15 01:32:19 +0100 |
| commit | f820e2805c7acb157a78438d07e47f4fc57fe679 (patch) | |
| tree | 53d638a93450e21eaefcce74495a512e56623fc6 /arch/xtensa/include/asm/pgalloc.h | |
| parent | iommu/arm-smmu: handle pgtable_page_ctor() fail (diff) | |
| download | linux-f820e2805c7acb157a78438d07e47f4fc57fe679.tar.xz linux-f820e2805c7acb157a78438d07e47f4fc57fe679.zip | |
xtensa: use buddy allocator for PTE table
At the moment xtensa uses slab allocator for PTE table. It doesn't work
with enabled split page table lock: slab uses page->slab_cache and
page->first_page for its pages. These fields share stroage with
page->ptl.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Chris Zankel <chris@zankel.net>
Acked-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/xtensa/include/asm/pgalloc.h')
| -rw-r--r-- | arch/xtensa/include/asm/pgalloc.h | 20 |
1 files changed, 12 insertions, 8 deletions
diff --git a/arch/xtensa/include/asm/pgalloc.h b/arch/xtensa/include/asm/pgalloc.h index b8774f1e21e6..d38eb9237e64 100644 --- a/arch/xtensa/include/asm/pgalloc.h +++ b/arch/xtensa/include/asm/pgalloc.h @@ -38,14 +38,18 @@ static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) free_page((unsigned long)pgd); } -/* Use a slab cache for the pte pages (see also sparc64 implementation) */ - -extern struct kmem_cache *pgtable_cache; - static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address) { - return kmem_cache_alloc(pgtable_cache, GFP_KERNEL|__GFP_REPEAT); + pte_t *ptep; + int i; + + ptep = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT); + if (!ptep) + return NULL; + for (i = 0; i < 1024; i++) + pte_clear(NULL, 0, ptep + i); + return ptep; } static inline pgtable_t pte_alloc_one(struct mm_struct *mm, @@ -59,7 +63,7 @@ static inline pgtable_t pte_alloc_one(struct mm_struct *mm, return NULL; page = virt_to_page(pte); if (!pgtable_page_ctor(page)) { - kmem_cache_free(pgtable_cache, pte); + __free_page(page); return NULL; } return page; @@ -67,13 +71,13 @@ static inline pgtable_t pte_alloc_one(struct mm_struct *mm, static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) { - kmem_cache_free(pgtable_cache, pte); + free_page((unsigned long)pte); } static inline void pte_free(struct mm_struct *mm, pgtable_t pte) { pgtable_page_dtor(pte); - kmem_cache_free(pgtable_cache, page_address(pte)); + __free_page(pte); } #define pmd_pgtable(pmd) pmd_page(pmd) |