From: Gerald Schaefer Date: Mon, 28 Apr 2008 09:13:28 +0000 (-0700) Subject: hugetlbfs: add missing TLB flush to hugetlb_cow() X-Git-Tag: v2.6.26-rc1~935 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8fe627ec5b7c47b1654dff50536d9709863295a3;p=pandora-kernel.git hugetlbfs: add missing TLB flush to hugetlb_cow() A cow break on a hugetlbfs page with page_count > 1 will set a new pte with set_huge_pte_at(), w/o any tlb flush operation. The old pte will remain in the tlb and subsequent write access to the page will result in a page fault loop, for as long as it may take until the tlb is flushed from somewhere else. This patch introduces an architecture-specific huge_ptep_clear_flush() function, which is called before the the set_huge_pte_at() in hugetlb_cow(). ATTENTION: This is just a nop on all architectures for now, the s390 implementation will come with our large page patch later. Other architectures should define their own huge_ptep_clear_flush() if needed. Acked-by: Martin Schwidefsky Signed-off-by: Gerald Schaefer Cc: Paul Mundt Cc: "Luck, Tony" Cc: Ingo Molnar Cc: Thomas Gleixner Cc: "David S. Miller" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- Reading git-diff-tree failed