From nobody Thu Apr 9 20:05:52 2026 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 8AD3E3D348C; Fri, 6 Mar 2026 15:29:22 +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=1772810962; cv=none; b=tdbNnf6lChVvjKylXusOsWjvRuGyD+kZLXNxNwjURnQpBOy5K6j5D0ca54Gj59b7kwJKqI7rq9EJtxhpSoPqF9Az5nt7QvGuH4CGNYJ0fQVyjeY7+66KRvuZ+z1uyucZRTZcisWjxvnfcyihTRnIUdUoMBXxDaXzzneZM6ZhqSA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772810962; c=relaxed/simple; bh=BNmBp855yDuZHxGokx46EelosP2pYBbR2PhSTdYtR0Q=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=EyR2O4L0g59RY6Ej4TOiKzqi2JpwogWuCG565L5gQ13fpFx9BIf29E4dAW3XBxFSBeI6P5MDhvYQnbYnidv0fuZJ2RpCZ/lVKMjqF33NuGaRS+95/EK+wwRn4TM+9ykLBpErI+TnfgJY1VAeSxDHnv992jByvXMFyynz2QOPaPo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=tDEspnsk; 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="tDEspnsk" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 576B0C2BCAF; Fri, 6 Mar 2026 15:29:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772810962; bh=BNmBp855yDuZHxGokx46EelosP2pYBbR2PhSTdYtR0Q=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=tDEspnskaNEi9nA0EiGpws7eiJ4ZKcOygic65UXT0LnFrQTn3lBb6SH6fraYsS3mv 0WFYE4+sedwEG7jybwDPXo/ta3KY7kGYO/X5RJEVMlSqsbDh0X81GvkbewH6Ycv4fB ENyIDVPA7gBCOnsI1X4kaA5StvU/XR2i3q7G+V8RCzTPeR5ertDm0HJ0u9fjkQzOF8 80jhLQgmROa1oz4tIHOkQjlTA8dxZzosw9XYeOxjyeGZT7h/rBpwhdTx4Go1lEf8Vb f1rVcaQasQLhQ3PGIFBoCwO+lMg23DH7zixHH4JVollqyr2f3mxhfQXG6zXkqZLNTQ ZjercEiL6RlmQ== From: SeongJae Park To: Andrew Morton Cc: SeongJae Park , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 02/10] mm/damon/core: add damon_new_region() debug_sanity check Date: Fri, 6 Mar 2026 07:29:05 -0800 Message-ID: <20260306152914.86303-3-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260306152914.86303-1-sj@kernel.org> References: <20260306152914.86303-1-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: quoted-printable Content-Type: text/plain; charset="utf-8" damon_new_region() is supposed to be called with only valid address range arguments. Do the check under DAMON_DEBUG_SANITY. Signed-off-by: SeongJae Park --- mm/damon/core.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/mm/damon/core.c b/mm/damon/core.c index f1a97e85824ac..0c1353164ec81 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -109,6 +109,17 @@ int damon_select_ops(struct damon_ctx *ctx, enum damon= _ops_id id) return err; } =20 +#ifdef CONFIG_DAMON_DEBUG_SANITY +static void damon_verify_new_region(unsigned long start, unsigned long end) +{ + WARN_ONCE(start >=3D end, "start %lu >=3D end %lu\n", start, end); +} +#else +static void damon_verify_new_region(unsigned long start, unsigned long end) +{ +} +#endif + /* * Construct a damon_region struct * @@ -118,6 +129,7 @@ struct damon_region *damon_new_region(unsigned long sta= rt, unsigned long end) { struct damon_region *region; =20 + damon_verify_new_region(start, end); region =3D kmem_cache_alloc(damon_region_cache, GFP_KERNEL); if (!region) return NULL; --=20 2.47.3