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| author | Honggyu Kim <[email protected]> | 2025-07-02 00:02:04 +0000 |
|---|---|---|
| committer | Andrew Morton <[email protected]> | 2025-07-10 04:07:55 +0000 |
| commit | bd225b9591442065beb876da72656f4a2d627d03 (patch) | |
| tree | ed3d351bbec8bf8869badf63f8a31b9578e7defc /fs/proc/task_mmu.c | |
| parent | samples/damon: fix damon sample mtier for start failure (diff) | |
| download | kernel-bd225b9591442065beb876da72656f4a2d627d03.tar.gz kernel-bd225b9591442065beb876da72656f4a2d627d03.zip | |
mm/damon: fix divide by zero in damon_get_intervals_score()
The current implementation allows having zero size regions with no special
reasons, but damon_get_intervals_score() gets crashed by divide by zero
when the region size is zero.
[ 29.403950] Oops: divide error: 0000 [#1] SMP NOPTI
This patch fixes the bug, but does not disallow zero size regions to keep
the backward compatibility since disallowing zero size regions might be a
breaking change for some users.
In addition, the same crash can happen when intervals_goal.access_bp is
zero so this should be fixed in stable trees as well.
Link: https://lkml.kernel.org/r/[email protected]
Fixes: f04b0fedbe71 ("mm/damon/core: implement intervals auto-tuning")
Signed-off-by: Honggyu Kim <[email protected]>
Reviewed-by: SeongJae Park <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Diffstat (limited to 'fs/proc/task_mmu.c')
0 files changed, 0 insertions, 0 deletions