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 7/8] mm/damon/core: remove start, end check in damon_set_region_system_rams()
Date: Wed, 1 Jul 2026 07:48:09 -0700 [thread overview]
Message-ID: <20260701144815.113325-8-sj@kernel.org> (raw)
In-Reply-To: <20260701144815.113325-1-sj@kernel.org>
damon_set_region_system_rams() validates user inputs to avoid creating a
negative size region. But DAMON core avoids zero size, too. The check
is incomplete. The complete check is done inside damon_set_regions(),
which is eventually called from damon_set_region_system_rams_default().
Drop the incomplete and unnecessary check.
Signed-off-by: SJ Park <sj@kernel.org>
---
mm/damon/core.c | 3 ---
1 file changed, 3 deletions(-)
diff --git a/mm/damon/core.c b/mm/damon/core.c
index 6b30cb6007e54..3caf1b67a7f98 100644
--- a/mm/damon/core.c
+++ b/mm/damon/core.c
@@ -3847,9 +3847,6 @@ int damon_set_region_system_rams_default(struct damon_target *t,
{
struct damon_addr_range addr_range;
- if (*start > *end)
- return -EINVAL;
-
if (!*start && !*end &&
!damon_find_system_rams_range(start, end, addr_unit))
return -EINVAL;
--
2.47.3
next 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 ` SJ Park [this message]
2026-07-01 14:48 ` [RFC PATCH 8/8] mm/damon/sysfs: remove region size validation SJ Park
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