From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1ACE5317715; Sat, 21 Feb 2026 19:36:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771702596; cv=none; b=juh0IRQXGJ8wdktIMRrm5VIOvJGRxpa59co0+VjKWZRsg2hhWP6J/L4kKjt/yn8KWnMPWv/y0q+AD4h9aJ15c6o/a0sLrWiJilHggE/vWU2CzGRUOnGKSdeB2zq+ngW0y+IovUJOZMW1X8A42KraT1YhTGySqRvkVZvGnEPa9PU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771702596; c=relaxed/simple; bh=hTJuo1zGiIhoE2C8xzUpqoPqVjI2PLBsSgMe7nKwEuc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=gPNSfuAdgKoNLZm8plSYOAWFfQmUX0bTPVYL2FVE7evniXn2c8Hso2yRHw+3Atg0AeDlJJnHDa/CYh9+u7dGY4upF9dqc8coXL9e2MOHBQb/4iKZdLMDvhQm7CyeI89jfjqlB3d+rfV7JQ+IEDS+x3OwjG6neKZ051j8truiZRY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=bnBaaJmV; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="bnBaaJmV" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 86355C2BC86; Sat, 21 Feb 2026 19:36:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1771702596; bh=hTJuo1zGiIhoE2C8xzUpqoPqVjI2PLBsSgMe7nKwEuc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; 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> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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