hugetlb: call mmu notifiers on hugepage cow
authorDoug Doan <dougd@cray.com>
Tue, 10 Aug 2010 00:18:30 +0000 (17:18 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Tue, 10 Aug 2010 03:44:54 +0000 (20:44 -0700)
commit3edd4fc9537d95e460d502987c63a90d6b9a7a82
treefe0563459b9d6104dcc7f7ab6f8945e815f09665
parenta1b200e27c0426ea98c1231a2b78c6094eb073e4
hugetlb: call mmu notifiers on hugepage cow

When a copy-on-write occurs, we take one of two paths in handle_mm_fault:
through handle_pte_fault for normal pages, or through hugetlb_fault for
huge pages.

In the normal page case, we eventually get to do_wp_page and call mmu
notifiers via ptep_clear_flush_notify.  There is no callout to the mmmu
notifiers in the huge page case.  This patch fixes that.

Signed-off-by: Doug Doan <dougd@cray.com>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
mm/hugetlb.c