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Thu, 19 Mar 2026 17:16:23 +0100 (CET) From: Josh Law To: sj@kernel.org, akpm@linux-foundation.org Cc: damon@lists.linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Josh Law Subject: [PATCH 2/2] mm/damon/reclaim: fix min_age_region truncation from unsigned long to unsigned int Date: Thu, 19 Mar 2026 16:16:20 +0000 Message-Id: <20260319161620.189392-3-objecting@objecting.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260319161620.189392-1-objecting@objecting.org> References: <20260319161620.189392-1-objecting@objecting.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-ZohoMailClient: External X-Rspamd-Queue-Id: 824AC40013 X-Rspamd-Server: rspam07 X-Stat-Signature: egmijh9tqt8jah7fzwjd8diu981tjx7i X-Rspam-User: X-HE-Tag: 1773936997-488049 X-HE-Meta: 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 99aF/7nj rXCRrbGwFXEf+kfpOXpTW/lT8T3br+ohLPa6qJRCJXIykhvlJYp0aIJWJiDGMoS64tI84YdV7xtPt8g1eZt134jT0vhewPmNrDmKTTF/xTInp3RAkDNphpunoHjMg1prvywg15R/FEL/nJzd8mtohGzUulZ/wHyPjSSRiMaPWZgVHIJCWoFBfJvAnFIsTUqukkqAkgFlyBOqkKeL2hRDxSiglqNTYfGBNrjgn2lUe+ChJwnxuT8JxvDZ+Gqb2LsOSVWP2uTffe4lHEu0m8zgcMJDQdgMVPzggD5FDh2PdrT2m+VahM/bEd8ZD052pc4Mhjyq0JeykSFmnAza/d4DrdCAti/84a4CCyEcu3SMsF8x8rKxtQz7KA5rcDGi4ZhmkPPhXdVYl+Zr1Ujk= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: min_age / aggr_interval can exceed UINT_MAX with extreme but valid module parameter values, silently truncating min_age_region and lowering the cold-page age threshold below what the user intended. Clamp the result to UINT_MAX to match the field's type. Signed-off-by: Josh Law --- mm/damon/reclaim.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/mm/damon/reclaim.c b/mm/damon/reclaim.c index 9b55df304e51..303c64a56073 100644 --- a/mm/damon/reclaim.c +++ b/mm/damon/reclaim.c @@ -170,8 +170,8 @@ static struct damos *damon_reclaim_new_scheme(void) .min_nr_accesses = 0, .max_nr_accesses = 0, /* for min_age or more micro-seconds */ - .min_age_region = min_age / - damon_reclaim_mon_attrs.aggr_interval, + .min_age_region = min_t(unsigned long, min_age / + damon_reclaim_mon_attrs.aggr_interval, UINT_MAX), .max_age_region = UINT_MAX, }; -- 2.34.1