From: SJ Park <sj@kernel.org>
Cc: SJ Park <sj@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
damon@lists.linux.dev, linux-kernel@vger.kernel.org,
linux-mm@kvack.org
Subject: [RFC PATCH 8/8] mm/damon/sysfs: remove region size validation
Date: Wed, 1 Jul 2026 07:48:10 -0700 [thread overview]
Message-ID: <20260701144815.113325-9-sj@kernel.org> (raw)
In-Reply-To: <20260701144815.113325-1-sj@kernel.org>
DAMON_SYSFS validates user inputs for monitoring target regions to
disallow negative size regions. DAMON core assumes only positive size
regions, though. The validation is incomplete. Fortunately
damon_set_regions(), which is eventually used by DAMON_SYSFS, does the
complete validation. Remove the incomplete and unnecessary validation.
Signed-off-by: SJ Park <sj@kernel.org>
---
mm/damon/sysfs.c | 3 ---
1 file changed, 3 deletions(-)
diff --git a/mm/damon/sysfs.c b/mm/damon/sysfs.c
index e666dddf1feba..b65651498e0d1 100644
--- a/mm/damon/sysfs.c
+++ b/mm/damon/sysfs.c
@@ -1987,9 +1987,6 @@ static int damon_sysfs_set_regions(struct damon_target *t,
struct damon_sysfs_region *sys_region =
sysfs_regions->regions_arr[i];
- if (sys_region->ar.start > sys_region->ar.end)
- goto out;
-
ranges[i].start = sys_region->ar.start;
ranges[i].end = sys_region->ar.end;
if (i == 0)
--
2.47.3
prev parent reply other threads:[~2026-07-01 14:48 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-01 14:48 [RFC PATCH 0/8] mm/damon: validate all parameters in the core SJ Park
2026-07-01 14:48 ` [RFC PATCH 1/8] mm/damon/core: safely validate src on damon_commit_ctx() SJ Park
2026-07-01 14:48 ` [RFC PATCH 2/8] mm/damon/core: do parameter testing commit on damon_start() SJ Park
2026-07-01 14:48 ` [RFC PATCH 3/8] mm/damon/sysfs: remove duplicated commit input validity check SJ Park
2026-07-01 14:48 ` [RFC PATCH 4/8] mm/damon/reclaim: remove duplicated min_region_sz power of 2 check SJ Park
2026-07-01 14:48 ` [RFC PATCH 5/8] mm/damon/lru_sort: remove duplicated min_region_sz power_of_2() check SJ Park
2026-07-01 14:48 ` [RFC PATCH 6/8] mm/damon: document region size validation in damon_set_regions() SJ Park
2026-07-01 14:48 ` [RFC PATCH 7/8] mm/damon/core: remove start, end check in damon_set_region_system_rams() SJ Park
2026-07-01 14:48 ` SJ Park [this message]
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