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b=GB4ZFNP86ucw+3iCZiFXKFSKc+7g7gQXYBizUVaM6G8Pj5spY5ST9Ekt2IMMeJPSv ujn4pxCagJ8hVsjzpmdB5AZwSv+BwpeYomGyngaJVAhKPUhDJd8kO9Ki1uLpkUDxmU jgl3T2QbmIMMnMw4xG63UgEC6QJojN5Yp4J9vzqz5oR2FZuTREgMJy+sa4+Lq1V81D gBAQD03RWTC+cT/HNkoiWnHNWyY2vmsi+oSCpTobkdBgmdM+q3o3A8r/A4dYmrLOl0 rHTj1f43HloJtzgTWOzPQc/ryMrkIP9wNBcf1HzwTyMTO6Y2fbGo5LqWaGMOFuIlcJ 1ESR5NKOJQC5g== 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 07/10] mm/damon/core: add damon_split_region_at() debug_sanity check Date: Sat, 21 Feb 2026 11:36:24 -0800 Message-ID: <20260221193629.19332-8-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260221193629.19332-1-sj@kernel.org> References: <20260221193629.19332-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam09 X-Stat-Signature: d34q5zxxgbwa43yffkw417eqbugp7nnw X-Rspamd-Queue-Id: 0E00BC0008 X-Rspam-User: X-HE-Tag: 1771702597-81966 X-HE-Meta: U2FsdGVkX1+FyoT6j4NqfAJIOdPAxYFEx7WqPXkTCRRU77yNwC7+Kk6QFWYv328s2C7SqZUul1cXCF8IkFVO75KRnVS7ejrOTFfx8mxXBcwlq8vrjZGl1nR+uvqUga35diHh17PJO5/ul4HSQNNjhCGshc6vOlx3JhP8XVqyzrgeDNBVgv0tpN3GLGghVqJwmbF/Y9rO0O2H3rHE4OeJg+hHElwelN+R1bUIp3Sa7+jJkqZZxvLhxg45jySRDyLSz99LEEHPb+65csDLbv5RUKPhxuuFExFp4mk1ogNBhe7laooaKQMetKzbVUjmqAcH6jjG/cM8BPhPZD9tDc4fAjsbvnolvNTFFzRByTLyEq1EsJl6OAa/Kt3zengkgNDPou1UHOxbtDlX5p86Hw985Pr1meyms8KWp52vHMEXUFiibO1Ah/ITHOa4iQnvc/yeK7NHoge2NguAB45mt42P/xbPDpLzQtG+WZZ7uMIJZp2gphLh4Nsaff3Uh6csntxwRKBNRgFW/Rem7UvYmRS54sVWbdX9F+I9NdLPLGpaJClLDYQxXSAfZDNipEtwC0VGyGDJr0ELNShwPnsXk3ilbYEfj4fl5FfqbEL5DOKb88WljrgWkNR5ezH9tcFlk5CLiEJd1LeaIJq1eTY+BWUAotuQM2kCcQSieIgk23w66YI2YigDbXDcxWoxrpptugcktWKRQZJCc9YPyDhGa5F+d9TeWDd1vcakSxlF5LRooJRwdgg79wNmjiiHzPGz691rNxRh0hbWDgPTPBDFv4PXWxCgMdNS2MMSGwEd3P7XkhOIJHHz8w7Q6DFwQ6+xqGOhqXQplHtvREbDBJzol9cYxaq0wAO8vnaBi2BYFszA4jCQ9Oi4/EsHRCJxgimP59kp2/3ApU1mjikDxPOIOnSIAk7XiDdaph75Hs2KMEijAf+deNJNzuUwV+kbOAjodh6dLc0pn6EfFCAW8p0ETPS nCJL26pq HZLPMOd1NQvprgk1KA2zhRohMOe67cN04CzAaU/5CRxYMEnYLOQV85lYrKEHX64AJbmHCq0+YnW3FbyBI7oiNw8c5XCqztC0aOssGf0szL920iO3NudGtQWuTnR67IGpP1MRIiwE8t5MvCzEBjYO/2UP8VyG1ZCe8M7Z+jvhNU2Jqy0YT/usqU+PWsDFw6dTrxWS/002+8mtZ+QSeDE9DsMVycrqJtpI7D1u34C2pIsMdEKfBlcTtSTZt8/gD2wnjte5XMwirBQcFrDjoVyjk3GLt6HPWqY0fsmXD3FKS+Yv4mSPnphYl/jMzWQ== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 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 | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/mm/damon/core.c b/mm/damon/core.c index 94be598cafef1..16f7994903d6d 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -2629,6 +2629,23 @@ 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) +{ + if (sz_r > 0 && sz_r < damon_sz_region(r)) + return; + pr_err("damon_split_region() call with r %lu-%lu (%lu), sz_r %lu\n", + r->ar.start, r->ar.end, damon_sz_region(r), sz_r); + WARN_ONCE(); +} +#else +static void damon_verify_split_region_at(struct damon_region *r, + unsigned long sz_r) +{ +} +#endif + /* * Split a region in two * @@ -2640,6 +2657,8 @@ 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