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(parent: 75afb35) | patch
cfq: explicitly use 64bit divide operation for 64bit arguments
authorAnatol Pomozov <anatol.pomozov@gmail.com>
Sun, 22 Sep 2013 18:43:47 +0000 (12:43 -0600)
committerJens Axboe <axboe@kernel.dk>
Sun, 22 Sep 2013 18:43:47 +0000 (12:43 -0600)
commitf3cff25f05f2ac29b2ee355e611b0657482f6f1d
tree8a06c59f0970a8bd4be2939792fc88ffddc39e62tree | snapshot
parent75afb352991ff1cd3cf5955bfe611de6d83a0c87commit | diff
cfq: explicitly use 64bit divide operation for 64bit arguments

'samples' is 64bit operant, but do_div() second parameter is 32.
do_div silently truncates high 32 bits and calculated result
is invalid.

In case if low 32bit of 'samples' are zeros then do_div() produces
kernel crash.

Signed-off-by: Anatol Pomozov <anatol.pomozov@gmail.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
block/cfq-iosched.c diff | blob | history
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