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| author | Andrey Ryabinin <aryabinin@virtuozzo.com> | 2016-03-15 14:55:27 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-01-17 09:35:27 +0100 |
| commit | 45c26b0736efad011b829d587fadf7085f948294 (patch) | |
| tree | 96bd24c735c9b5fa9aa88bc62fec180b4398897a /tools/perf/scripts/python | |
| parent | 9780795fc1e5e3d6a98374df01d1f10372203fdf (diff) | |
mm/page-writeback: fix dirty_ratelimit calculation
commit d59b1087a98e402ed9a7cc577f4da435f9a555f5 upstream.
Calculation of dirty_ratelimit sometimes is not correct. E.g. initial
values of dirty_ratelimit == INIT_BW and step == 0, lead to the
following result:
UBSAN: Undefined behaviour in ../mm/page-writeback.c:1286:7
shift exponent 25600 is too large for 64-bit type 'long unsigned int'
The fix is straightforward - make step 0 if the shift exponent is too
big.
Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Mel Gorman <mgorman@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'tools/perf/scripts/python')
0 files changed, 0 insertions, 0 deletions