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authorWill Deacon <will.deacon@arm.com>2012-10-08 16:29:32 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-10-09 16:22:24 +0900
commit5d3a551c28c6669dc43be40d8fafafbc2ec8f42b (patch)
treeb3a9608ca6ab208d2c08e4fb4978037fe805764e /arch/tile
parent01dc52ebdf472f77cca623ca693ca24cfc0f1bbe (diff)
downloadlinux-5d3a551c28c6669dc43be40d8fafafbc2ec8f42b.tar.bz2
mm: hugetlb: add arch hook for clearing page flags before entering pool
The core page allocator ensures that page flags are zeroed when freeing pages via free_pages_check. A number of architectures (ARM, PPC, MIPS) rely on this property to treat new pages as dirty with respect to the data cache and perform the appropriate flushing before mapping the pages into userspace. This can lead to cache synchronisation problems when using hugepages, since the allocator keeps its own pool of pages above the usual page allocator and does not reset the page flags when freeing a page into the pool. This patch adds a new architecture hook, arch_clear_hugepage_flags, so that architectures which rely on the page flags being in a particular state for fresh allocations can adjust the flags accordingly when a page is freed into the pool. Signed-off-by: Will Deacon <will.deacon@arm.com> Cc: Michal Hocko <mhocko@suse.cz> Reviewed-by: Michal Hocko <mhocko@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/tile')
-rw-r--r--arch/tile/include/asm/hugetlb.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/tile/include/asm/hugetlb.h b/arch/tile/include/asm/hugetlb.h
index b2042380a5aa..0f885af2b621 100644
--- a/arch/tile/include/asm/hugetlb.h
+++ b/arch/tile/include/asm/hugetlb.h
@@ -106,6 +106,10 @@ static inline void arch_release_hugepage(struct page *page)
{
}
+static inline void arch_clear_hugepage_flags(struct page *page)
+{
+}
+
#ifdef CONFIG_HUGETLB_SUPER_PAGES
static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
struct page *page, int writable)