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 3D3193101DB; Sat, 21 Feb 2026 19:36:35 +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=1771702595; cv=none; b=eR9WyngRmGVshMlt4JRH0fSw0ucHhuyZMA8qPkqd2jIbeF2amrNfHs6DU5yX/SNHPuPRkHlHe2HFbdT7fQ6AlOp7ID9We0O23uaJLlfM3O8Eky0vX1XGFF+XidIoCPjse5RLTevtd4w6Cs3ozewB7LpY1bSbJsl6FpR+9nqmvvs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771702595; c=relaxed/simple; bh=l038CwXEsRXfQGW1aiTP2FYS/HRgWbBchKOVGaSDEes=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=JUd/e8pL/9BzZNTq9vaRgZASPYSBN1FUtxHsr5jOj4y8KFgk5oh6vO2G7oXzeUUmYnp9XtsrbUf/0ZMHEDVLkHU5uvQIA3KWjYaYyJ/sKvHoKzSBjI8Y00MvLbv/bo+Kpzemr5nAbWwfXj3DgHzFxblfmJRn06zTyEoKduG5CXk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=celEuxFU; 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="celEuxFU" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C92CEC2BC87; Sat, 21 Feb 2026 19:36:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1771702594; bh=l038CwXEsRXfQGW1aiTP2FYS/HRgWbBchKOVGaSDEes=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=celEuxFUEJPGHRlpjOEuVXuEbu7+3pNdX2nDOFCvfoCvNKM5OJI51+jQbxLSzLPfs tlN7VD99W/tL/MUmtrjJGG59xgAvzUz62Vy6YWPOBVQMZxq5swA3XfsBwhrNqpuvDG pH5T7u3psglNSpdCk+S3mDI73aW3FdpwAR0fvr7wrTZOV6vww35173qbdJ4AFGZMpK AWlpT/wQUeDu+DVw15l7sHpUJgt0lndxke4bG/uSiLYBxGjPQHbPiyYCc3f7ZsoyVI f/tX82f7XvG9/W22w6egNzvnHXXth2le5XTYK/cU8a5/1307TRhUGNJQJ4mXM6m2RH JVpEfl5Z9OMhg== 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 02/10] mm/damon/core: add damon_new_region() debug_sanity check Date: Sat, 21 Feb 2026 11:36:19 -0800 Message-ID: <20260221193629.19332-3-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_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 | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/mm/damon/core.c b/mm/damon/core.c index 602b85ef23597..a7f5748c1fe17 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -109,6 +109,22 @@ int damon_select_ops(struct damon_ctx *ctx, enum damon_ops_id id) return err; } +#ifdef CONFIG_DAMON_DEBUG_SANITY +static void damon_verify_new_region(unsigned long start, unsigned long end) +{ + + if (start < end) + return; + pr_err("damon_new_region() s called with start %lu >= end %lu!\n", + start, end); + WARN_ONCE(); +} +#else +static void damon_verify_new_region(unsigned long start, unsigned long end) +{ +} +#endif + /* * Construct a damon_region struct * @@ -122,6 +138,8 @@ struct damon_region *damon_new_region(unsigned long start, unsigned long end) if (!region) return NULL; + damon_verify_new_region(start, end); + region->ar.start = start; region->ar.end = end; region->nr_accesses = 0; -- 2.47.3