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| author | Rik van Riel <riel@redhat.com> | 2014-05-06 21:50:01 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-05-06 22:04:58 +0200 |
| commit | d5c9fde3dae750889168807038243ff36431d276 (patch) | |
| tree | 8b57ac0da7278daae45c9b7ac87a6bec7a554983 /mm/compaction.c | |
| parent | hugetlb: ensure hugepage access is denied if hugepages are not supported (diff) | |
| download | linux-d5c9fde3dae750889168807038243ff36431d276.tar.xz linux-d5c9fde3dae750889168807038243ff36431d276.zip | |
mm/page-writeback.c: fix divide by zero in pos_ratio_polynom
It is possible for "limit - setpoint + 1" to equal zero, after getting
truncated to a 32 bit variable, and resulting in a divide by zero error.
Using the fully 64 bit divide functions avoids this problem. It also
will cause pos_ratio_polynom() to return the correct value when
(setpoint - limit) exceeds 2^32.
Also uninline pos_ratio_polynom, at Andrew's request.
Signed-off-by: Rik van Riel <riel@redhat.com>
Reviewed-by: Michal Hocko <mhocko@suse.cz>
Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Nishanth Aravamudan <nacc@linux.vnet.ibm.com>
Cc: Luiz Capitulino <lcapitulino@redhat.com>
Cc: Masayoshi Mizuma <m.mizuma@jp.fujitsu.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/compaction.c')
0 files changed, 0 insertions, 0 deletions