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b=Nd9OgLsTu3ecaX5TcXHYptFLk841w3Y6SNtOGO/WiO3U5igWi7VKyhQGO+0xY/IZN CB1lRMIvdtpVfffuXIwuEoEAOEJrnomYD6d/Y9qNcWbdwcZtBUkqVxccMqOAdUdkYD DAe7rt6WxIetT6oStd5OPJRULSsWArXOSzyoHwDWXHeHiOJMTp+66u5FfatpQamtVy jFGNA7UirHT7L9w2YY07scAmlguyKpWM1yXN7kwb0LFhSs0rnztQlQsTRxhK/wYU76 s3HNbVT9S6htzjOSyrA2Exvb6Jg44UZMlxWlXzaesVddxPIqenY4heH0E/jPhNBMyD Wq+6dZgV8XiRA== 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 04/10] mm/damon/core: add damon_nr_regions() debug_sanity check Date: Sun, 1 Mar 2026 09:43:19 -0800 Message-ID: <20260301174327.76849-5-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: 27FE5180002 X-Stat-Signature: batzmtxw5kn8yfb9ditqq9nfx8npsmuy X-Rspam-User: X-HE-Tag: 1772387012-97427 X-HE-Meta: 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 lsBigvb7 d/rAPKiVF8gpZ//BawLDP5w+SStqY5BEPvkVLd/oWy/fWKaYyAjJmYzhDXhECZhCILRD2uyfg/gMIx5ulczMnadJuqQsGJYuUPgmb74kMyQJ5z7t+CQ7yiaUR6ZqmGx3raM8P8nJ0y7T5AaNZ6ljWPe57MJCqTtcbAJKgPg60caI8IKTFfFyFqtt2oQ+9iSsdJ9uc5sFIbAC86XTnVCyxZNOI0xsFGyGurN9Zbl/IBmqV7bw= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: damon_target->nr_regions is introduced to get the number quickly without having to iterate regions always. 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 92eac5eb96026..2b5aed89d449d 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -545,8 +545,27 @@ void damon_destroy_target(struct damon_target *t, struct damon_ctx *ctx) damon_free_target(t); } +#ifdef CONFIG_DAMON_DEBUG_SANITY +static void damon_verify_nr_regions(struct damon_target *t) +{ + struct damon_region *r; + unsigned int count = 0; + + damon_for_each_region(r, t) + count++; + WARN_ONCE(count != t->nr_regions, "t->nr_regions (%u) != count (%u)\n", + t->nr_regions, count); +} +#else +static void damon_verify_nr_regions(struct damon_target *t) +{ +} +#endif + unsigned int damon_nr_regions(struct damon_target *t) { + damon_verify_nr_regions(t); + return t->nr_regions; } -- 2.47.3