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b=bnBaaJmVPhcila4+rCDK54NN7dsnfuRDST8prP+m03KVFBp2tqmhkWLcRTInnG0LS nAKLYddEBKRvToqQjwJ6/bZSSXCM2Uz8QW/JTmnOgWpNE5vjd2/JUsgpFshffTMY6w vcgt5sVYNCtrnFkNqea18bzVmnOM3xZHZpErdI98da9aKquFUKWTsbdOzyzxCPCxYa sOOtvRHA2SVlJc+NBbAFx9GAgm+y8JASF7N6oy3wisqS1v4n1XpNxlKT8349mTSKJp vNqrNvFXGQGO4IQdSpqMtoQGdDJPqPkQZwsLOWOyJXu8WPapqPmfnQGGyAo4x+JW/Q T2ffAmM8tnhdQ== 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 04/10] mm/damon/core: add damon_nr_regions() debug_sanity check Date: Sat, 21 Feb 2026 11:36:21 -0800 Message-ID: <20260221193629.19332-5-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: 15t6ihtxrp1pshsafuu1czah96866m9d X-Rspam-User: X-Rspamd-Queue-Id: E1FB8180007 X-Rspamd-Server: rspam01 X-HE-Tag: 1771702596-493446 X-HE-Meta: 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 ybUClxCN unKRK6NiyCcEB/W9XjJXV1UU8LI85TCTDgcavyflnV2JLe7gnbANnBNZdxkkzZDBWvE33W3PReroXBfgfKx2bmA8BjaK74TlOH9sKD6ut23yLJHIrGUp5K9EqTnO2tVv9ew49FvctQqRtbq8yM/v4fI/g8iwCy6HS/imovAE+e+AUPd5brJL6Mu2xTFG4cV8YLqhMl8n5mZLy59gmoxPIJf2bJKkW0PPoJJ4BeaLGD6xv+2/6/21kIUWqrRxU6vWD70V4lpsVXFBZ+m6xITIRTKyEbA== 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_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 | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/mm/damon/core.c b/mm/damon/core.c index 7e03c3af03694..ede76e0789be3 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -556,8 +556,30 @@ 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++; + if (count == t->nr_regions) + return; + pr_err("damon_nr_regions(): t->nr_regions (%u) != real number (%u)\n", + t->nr_regions, count); + WARN_ONCE(); +} +#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