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 00017338939; Sun, 1 Mar 2026 17:43:32 +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=1772387013; cv=none; b=SdgiNxMSAJ8UgAL/ODwg33Wr2YoW9qghzMH0YUyTsCcIN7e5RQMuK0qoqfhBn56h3kDDYp9xMwcAdLyG4BL5PgEBtCXIcak61TNcKx+kCYMKITKG2JFS6gF2Y18Qe0HQ9/HJHEIc2mup8P2YV0CwmnBIphMKVh+TrhIgWeHLqNQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772387013; c=relaxed/simple; bh=DbZTn4AVN3XfN74TG8oRW8P+LKBDP3hbPLRg+ZDBhJg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=SyjSqHVWnixEPxP5fQ43lx/HGdcTE7sNREKAMpGzaaKNJMXWest4I3HDAEbGQ3qD/OArZE4s9wk3t5KQ0JwtfZN1B+xnmn9G5V6k6hlqG+0C1hReftZUN2j0g4VcAXECRR3lEfhfQACUU2AE2aMZZUldnuN24Tlilu+MfH5b2xc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=KNGnR+3F; 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="KNGnR+3F" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C115DC2BCB3; Sun, 1 Mar 2026 17:43:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772387012; bh=DbZTn4AVN3XfN74TG8oRW8P+LKBDP3hbPLRg+ZDBhJg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=KNGnR+3FH8t7f/g/HbzsZJ1b+HxQSNxrNdNk5f9Ui7Ge2IAItZ5wh/tea1t/N3JBp TEQVVevvzupSjNXtNyFfcwJRQ3aV74r5SIXBO4J6Jo4OGuTV1+N5F+zm7VfL2JHsQ/ 9BoSHUCJ9+weUZp3mWKkDk5CRbTUgpWyndLY5XGsUvvUftRbgK2FNREvnRmqcPrHpI 4eX4OjYPgt1eMRwykzNZsJ9saOMxKhN8+RRhsMU6/4G1UiUVMTeMBEWKkLtmB5j3Gk RMPUoZsLdM0Tr/MDLlLCUCOrxIHZskf4+I9mvm7iPmEvnjouzcDYG0WJcrvZzRzvKP sXyYx+rXCIONQ== 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 07/10] mm/damon/core: add damon_split_region_at() debug_sanity check Date: Sun, 1 Mar 2026 09:43:22 -0800 Message-ID: <20260301174327.76849-8-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> 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_split_region_at() should be called with the correct address to split on. Add a sanity check for that under CONFIG_DAMON_DEBUG_SANITY. Signed-off-by: SeongJae Park --- mm/damon/core.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/mm/damon/core.c b/mm/damon/core.c index 93d1577b1ae07..be2300cf3aeae 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -2586,6 +2586,21 @@ static void kdamond_merge_regions(struct damon_ctx *c, unsigned int threshold, threshold / 2 < max_thres); } +#ifdef CONFIG_DAMON_DEBUG_SANITY +static void damon_verify_split_region_at(struct damon_region *r, + unsigned long sz_r) +{ + WARN_ONCE(sz_r == 0 || sz_r >= damon_sz_region(r), + "sz_r: %lu r: %lu-%lu (%lu)\n", + sz_r, r->ar.start, r->ar.end, damon_sz_region(r)); +} +#else +static void damon_verify_split_region_at(struct damon_region *r, + unsigned long sz_r) +{ +} +#endif + /* * Split a region in two * @@ -2597,6 +2612,7 @@ static void damon_split_region_at(struct damon_target *t, { struct damon_region *new; + damon_verify_split_region_at(r, sz_r); new = damon_new_region(r->ar.start + sz_r, r->ar.end); if (!new) return; -- 2.47.3