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b=celEuxFUEJPGHRlpjOEuVXuEbu7+3pNdX2nDOFCvfoCvNKM5OJI51+jQbxLSzLPfs tlN7VD99W/tL/MUmtrjJGG59xgAvzUz62Vy6YWPOBVQMZxq5swA3XfsBwhrNqpuvDG pH5T7u3psglNSpdCk+S3mDI73aW3FdpwAR0fvr7wrTZOV6vww35173qbdJ4AFGZMpK AWlpT/wQUeDu+DVw15l7sHpUJgt0lndxke4bG/uSiLYBxGjPQHbPiyYCc3f7ZsoyVI f/tX82f7XvG9/W22w6egNzvnHXXth2le5XTYK/cU8a5/1307TRhUGNJQJ4mXM6m2RH JVpEfl5Z9OMhg== 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 02/10] mm/damon/core: add damon_new_region() debug_sanity check Date: Sat, 21 Feb 2026 11:36:19 -0800 Message-ID: <20260221193629.19332-3-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-Stat-Signature: 1hwrgosrd39hnxmxaipfbj7ss3a5hfbo X-Rspamd-Server: rspam11 X-Rspam-User: X-Rspamd-Queue-Id: B4B5E1C0012 X-HE-Tag: 1771702595-108574 X-HE-Meta: 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 lkwBGI/2 754Kua+sF82RUC3+RZsA7WjqtbD5+GKAXStcy3X9FrDONkvbUoc6Xl0pfclhLyrrFkfmDB+fIPQ2xlpG0bWAZRuGEkgznZpJvR3u71t3PGoGubG58MfnWWnk9nOV5xH5TcoLVt8DJKyfgDGi0in45nDxQ8IE5ZZJ5z4ZvFZGlIz2Re5agIDa8WpcqmtfYdPnRbI7msgxSE5rBOOSbjFjkk1eAk9bGjhnM4MoS8kcpuNTPjOmz/13Zzjqxj+xMzovjyQuvZEoCINshAtYLjgD1xvNjBg== 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_new_region() is supposed to be called with only valid address range arguments. Do the check under DAMON_DEBUG_SANITY. Signed-off-by: SeongJae Park --- mm/damon/core.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/mm/damon/core.c b/mm/damon/core.c index 602b85ef23597..a7f5748c1fe17 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -109,6 +109,22 @@ int damon_select_ops(struct damon_ctx *ctx, enum damon_ops_id id) return err; } +#ifdef CONFIG_DAMON_DEBUG_SANITY +static void damon_verify_new_region(unsigned long start, unsigned long end) +{ + + if (start < end) + return; + pr_err("damon_new_region() s called with start %lu >= end %lu!\n", + start, end); + WARN_ONCE(); +} +#else +static void damon_verify_new_region(unsigned long start, unsigned long end) +{ +} +#endif + /* * Construct a damon_region struct * @@ -122,6 +138,8 @@ struct damon_region *damon_new_region(unsigned long start, unsigned long end) if (!region) return NULL; + damon_verify_new_region(start, end); + region->ar.start = start; region->ar.end = end; region->nr_accesses = 0; -- 2.47.3