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mm/damon/reclaim: avoid divide-by-zero in damon_reclaim_apply_parameters() 

When creating a new scheme of DAMON_RECLAIM, the calculation of
'min_age_region' uses 'aggr_interval' as the divisor, which may lead to
division-by-zero errors.  Fix it by directly returning -EINVAL when such a
case occurs.

Link: https://lkml.kernel.org/r/20250827115858.1186261-3-yanquanmin1@huawei.com
Fixes: f5a79d7c0c ("mm/damon: introduce struct damos_access_pattern")
Signed-off-by: Quanmin Yan <yanquanmin1@huawei.com>
Reviewed-by: SeongJae Park <sj@kernel.org>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: ze zuo <zuoze1@huawei.com>
Cc: <stable@vger.kernel.org>	[6.1+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Quanmin Yan 2025-08-27 19:58:58 +08:00 committed by Andrew Morton
parent 711f19dfd7
commit e6b543ca98
1 changed files with 5 additions and 0 deletions
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5
mm/damon/reclaim.c
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@ -194,6 +194,11 @@ static int damon_reclaim_apply_parameters(void)
if (err)
return err;
if (!damon_reclaim_mon_attrs.aggr_interval) {
err = -EINVAL;
goto out;
}
err = damon_set_attrs(param_ctx, &damon_reclaim_mon_attrs);
if (err)
goto out;