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| author | Johannes Weiner <hannes@cmpxchg.org> | 2019-12-03 21:35:24 +0300 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2019-12-17 15:32:48 +0300 |
| commit | c3466952ca1514158d7c16c9cfc48c27d5c5dc0f (patch) | |
| tree | 2c5ed57633fc8461c1ba1c938e271c1f137bd8ae /kernel/sched/cpudeadline.c | |
| parent | 3dfbe25c27eab7c90c8a7e97b4c354a9d24dd985 (diff) | |
| download | linux-c3466952ca1514158d7c16c9cfc48c27d5c5dc0f.tar.xz | |
psi: Fix a division error in psi poll()
The psi window size is a u64 an can be up to 10 seconds right now,
which exceeds the lower 32 bits of the variable. We currently use
div_u64 for it, which is meant only for 32-bit divisors. The result is
garbage pressure sampling values and even potential div0 crashes.
Use div64_u64.
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Suren Baghdasaryan <surenb@google.com>
Cc: Jingfeng Xie <xiejingfeng@linux.alibaba.com>
Link: https://lkml.kernel.org/r/20191203183524.41378-3-hannes@cmpxchg.org
Diffstat (limited to 'kernel/sched/cpudeadline.c')
0 files changed, 0 insertions, 0 deletions