linux-kernel - Re: [RFC PATCH 2/2] mm/damon/reclaim: avoid divide-by-zero in damon_reclaim_apply

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Message-Id: <20250826143404.54232-1-sj@kernel.org>
Date: Tue, 26 Aug 2025 07:34:03 -0700
From: SeongJae Park <sj@...nel.org>
To: Quanmin Yan <yanquanmin1@...wei.com>
Cc: SeongJae Park <sj@...nel.org>,
	akpm@...ux-foundation.org,
	damon@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	wangkefeng.wang@...wei.com,
	zuoze1@...wei.com
Subject: Re: [RFC PATCH 2/2] mm/damon/reclaim: avoid divide-by-zero in damon_reclaim_apply_parameters()

On Tue, 26 Aug 2025 11:36:53 +0800 Quanmin Yan <yanquanmin1@...wei.com> wrote:

> 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.

Nice catch, thank you for this patch!

> 
> Fixes: f5a79d7c0c87 ("mm/damon: introduce struct damos_access_pattern")

Let's add Cc: stable@

> Signed-off-by: Quanmin Yan <yanquanmin1@...wei.com>

Reviewed-by: SeongJae Park <sj@...nel.org>


Thanks,
SJ

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