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(parent: c64cae1) | patch
mm: PageBuddy and mapcount robustness
authorAndrea Arcangeli <aarcange@redhat.com>
Thu, 17 Mar 2011 23:16:35 +0000 (00:16 +0100)
committerLinus Torvalds <torvalds@linux-foundation.org>
Thu, 17 Mar 2011 23:31:13 +0000 (16:31 -0700)
commita75fa1158d3bf7975073f192b327c3f5756fc4d8
tree0a22745dba03926768552aa3006b166995e5342dtree | snapshot
parentc64cae1d479db8b734b284464511d3890cfdcce3commit | diff
mm: PageBuddy and mapcount robustness

Change the _mapcount value indicating PageBuddy from -2 to -128 for
more robusteness against page_mapcount() undeflows.

Use reset_page_mapcount instead of __ClearPageBuddy in bad_page to
ignore the previous retval of PageBuddy().

Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Reported-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
include/linux/mm.h diff | blob | history
mm/page_alloc.c diff | blob | history
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