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b=lO29yu2ESlUHUzzR1nxvpCUFW3x9kKowPe+dexg3bbPFDyTPyO1qAg5OlX63GVDZJ 6QX+67cOGEcsKE/cM/xng61jC257qS2nQr8mAcDiSo3rGdV4S64yuB/TfZAlsG1t/6 FRUxCmpee3sP7q1l8PPnjz88byam8eUUxpahEtKo3v1BNgexzauiThP7xbWlE2Cyig TiapquwJwPYGpazfGQ2LUtRaJ8UwgkQRoqb7YVE3sNU1I2oAUh0tfz0Iytyl2Zqs53 66WyiSxAO/9BFrtpN3hcC/7Y2MFNIJQgeYLLTun6fIU+C5SS8Lb3kpWJy3sfXZxHIR GOb29K2ZilHng== 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 03/10] mm/damon/core: add damon_del_region() debug_sanity check Date: Sun, 1 Mar 2026 09:43:18 -0800 Message-ID: <20260301174327.76849-4-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-Queue-Id: 2C95C1C0008 X-Stat-Signature: nmr58kmuk9fzbex8h86u5nr8nu7yoekx X-Rspam-User: X-Rspamd-Server: rspam05 X-HE-Tag: 1772387012-46874 X-HE-Meta: U2FsdGVkX1/NfcatyUA6FhvwHHWKOcwYecTJiwE1bmkjhIZOEJrpcN2l1rbfR80ozRI+brVprfcYR8WTf95dVsjOIucpiVHQyddikKHC94v8PozyNSjZTcH6hCoZCoJmxRjEKaeLnpANnJHJgVZw7T8ScNt8VSBwKOTowp1KI7NjA4V7Q9s68l2FrelyEyD2uyFDwdAcr+oZSQQkkm16m39YfLgtHyAf/bkOa80Dy3YD6n8goj9olxeVROjS3l3ontqXllw11jyQihQ/9BHIydTnE7dfuCl1NF1aLZlctjw+tA6CPJdXN/4nqCN8QtXMMydFISLd5o/cPJjrV4LzyIcLuY7aC5OGNz69lhC0vFxs/o9zucCuPAAbNeoFKC0htry8fIAczV8Rw1fsH91zyMx6X4VI2Iw+IH/NVpc/pkl8L3YyoWBoSQzWbnkcydNrfxX+PtxmY27Km20LPb/Jm3TbH9cQ8ypa+/1Pfn/JUIJ00vk2BLf1rdVgT0xTJUeLBzdcCXPZmlYcXdFF9AjovxWe5yxIEFYUtIYU/wTbbnJX+SNUUvG4l5NDVlsXT+0kxJSwscl7zhwFATTronZBfH3iSt2ziR2vG7Z6VJ6Zfz0dlGgMkmKNcyd/p05kWBifmF5Qu2f83nZFZhIZaaLNGYJZCyVoK1EtiQNbK6mLmHZuwzqokIK/pjkI5bGWU4F2ZeKN549yo8hRBTD4m8SYnxyfP9rtBbxG+PQsyF/C8eWQyxco6vbOOu4DL7DR/dBpVnDgwpqRBWqkEEWYkn2nh0QRROG2fVOkvmjUMJtTdh8DnxhzDfnR5GiPZ/UozfyD0gjYCWbT39rLmbQxaB13Cp4Vy3Q/lC6GCwxshSNCSIoLhUZgBjaf/93ZGFIPj1PHkwPNfya3T3XsLRuQihuHC4qLIQsvayd1XSuE1+DqzXkEVWU28n+wrzG3gMVF12g0fHje57PIE+tJTjYYs0/ T4R8XmWb FYll0fWPb6noJfzzXVSAH6WhCcM207h6w20o1pQfE5Yv0G+JmHAfkEw6bWKZTYw/ur9BScajI7n1Hjhn4DYge1eCmHNvAcl4OiJEctzlUMJVLXI5EEB4xgOLlFwoypTnFzPDwc+GSBmBqc4ThKFLN+U2VknBIGrVUSdNUmnlT9YdMl0vOpRO8cygXpPdBoZ0vJusRWiDKiE2uhaWyas3z8ChUl8hzDzyT5YNydo6Vu/xE+NzufnaSgpy5Hi3vzt0g1w9xxNw/1OsnG8j0VyCa25qLnQ== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: damon_del_region() should be called for targets that have one or more regions. Add a sanity check for that under CONFIG_DAMON_DEBUG_SANITY. Signed-off-by: SeongJae Park --- mm/damon/core.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/mm/damon/core.c b/mm/damon/core.c index 0c1353164ec81..92eac5eb96026 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -152,8 +152,21 @@ void damon_add_region(struct damon_region *r, struct damon_target *t) t->nr_regions++; } +#ifdef CONFIG_DAMON_DEBUG_SANITY +static void damon_verify_del_region(struct damon_target *t) +{ + WARN_ONCE(t->nr_regions == 0, "t->nr_regions == 0\n"); +} +#else +static void damon_verify_del_region(struct damon_target *t) +{ +} +#endif + static void damon_del_region(struct damon_region *r, struct damon_target *t) { + damon_verify_del_region(t); + list_del(&r->list); t->nr_regions--; } -- 2.47.3