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authorAndrey Ryabinin <aryabinin@virtuozzo.com>2016-03-15 14:55:27 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-03-15 16:55:16 -0700
commitd59b1087a98e402ed9a7cc577f4da435f9a555f5 (patch)
treec0d59e0a254d7c4b9f31ee3a4873423cc200ee35 /mm/Kconfig.debug
parentb72d0ffb5dbc4070089b36230b98687ca4577cbc (diff)
mm/page-writeback: fix dirty_ratelimit calculation
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>
Diffstat (limited to 'mm/Kconfig.debug')
0 files changed, 0 insertions, 0 deletions