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rmap: remove obsolete check from __page_check_anon_rmap()

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When an anonymous page is inherited from a parent process, the
vma->anon_vma can differ from the page anon_vma.  This can trip up
__page_check_anon_rmap, which is indirectly called from do_swap_page().

Remove that obsolete check to prevent an oops.

Signed-off-by: Rik van Riel <riel@redhat.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Larry Woodman <lwoodman@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Hugh Dickins <hugh.dickins@tiscali.co.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Rik van Riel 2010-03-05 13:42:08 -08:00 committed by Linus Torvalds
parent 5beb493052
commit 033a64b56a
1 changed files with 0 additions and 3 deletions
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3
mm/rmap.c
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@ -754,9 +754,6 @@ static void __page_check_anon_rmap(struct page *page,
* are initially only visible via the pagetables, and the pte is locked
* over the call to page_add_new_anon_rmap.
*/
struct anon_vma *anon_vma = vma->anon_vma;
anon_vma = (void *) anon_vma + PAGE_MAPPING_ANON;
BUG_ON(page->mapping != (struct address_space *)anon_vma);
BUG_ON(page->index != linear_page_index(vma, address));
#endif
}