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b=KNGnR+3FH8t7f/g/HbzsZJ1b+HxQSNxrNdNk5f9Ui7Ge2IAItZ5wh/tea1t/N3JBp TEQVVevvzupSjNXtNyFfcwJRQ3aV74r5SIXBO4J6Jo4OGuTV1+N5F+zm7VfL2JHsQ/ 9BoSHUCJ9+weUZp3mWKkDk5CRbTUgpWyndLY5XGsUvvUftRbgK2FNREvnRmqcPrHpI 4eX4OjYPgt1eMRwykzNZsJ9saOMxKhN8+RRhsMU6/4G1UiUVMTeMBEWKkLtmB5j3Gk RMPUoZsLdM0Tr/MDLlLCUCOrxIHZskf4+I9mvm7iPmEvnjouzcDYG0WJcrvZzRzvKP sXyYx+rXCIONQ== From: SeongJae Park To: Cc: SeongJae Park , Andrew Morton , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [RFC PATCH v2 07/10] mm/damon/core: add damon_split_region_at() debug_sanity check Date: Sun, 1 Mar 2026 09:43:22 -0800 Message-ID: <20260301174327.76849-8-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260301174327.76849-1-sj@kernel.org> References: <20260301174327.76849-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: DDD7220002 X-Stat-Signature: dmjau9neknhbyhiccgtghkjy7a8ucxwn X-Rspam-User: X-HE-Tag: 1772387014-871314 X-HE-Meta: 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 uTT9isEy 16qZI Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: damon_split_region_at() should be called with the correct address to split on. Add a sanity check for that under CONFIG_DAMON_DEBUG_SANITY. Signed-off-by: SeongJae Park --- mm/damon/core.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/mm/damon/core.c b/mm/damon/core.c index 93d1577b1ae07..be2300cf3aeae 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -2586,6 +2586,21 @@ static void kdamond_merge_regions(struct damon_ctx *c, unsigned int threshold, threshold / 2 < max_thres); } +#ifdef CONFIG_DAMON_DEBUG_SANITY +static void damon_verify_split_region_at(struct damon_region *r, + unsigned long sz_r) +{ + WARN_ONCE(sz_r == 0 || sz_r >= damon_sz_region(r), + "sz_r: %lu r: %lu-%lu (%lu)\n", + sz_r, r->ar.start, r->ar.end, damon_sz_region(r)); +} +#else +static void damon_verify_split_region_at(struct damon_region *r, + unsigned long sz_r) +{ +} +#endif + /* * Split a region in two * @@ -2597,6 +2612,7 @@ static void damon_split_region_at(struct damon_target *t, { struct damon_region *new; + damon_verify_split_region_at(r, sz_r); new = damon_new_region(r->ar.start + sz_r, r->ar.end); if (!new) return; -- 2.47.3