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 DEDB42E1EE5; Sun, 1 Mar 2026 17:43:31 +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=1772387011; cv=none; b=ax6eAkFNu1/eOx7rG47v2cJxwGeCw8gEZdhugN1wYUk9QjdGQrpEDJONFoSjzgunqq+eh3b2SfX+jXmfQv1vXhQvKEfOXuWgmsfCValBzVRZ6RU8VUfBVqod9AQ1Kfrj1k8sGzquc4jWA+RxkO7ZMPnnJZ1yURuqn93m9mAVeJ4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772387011; c=relaxed/simple; bh=BNmBp855yDuZHxGokx46EelosP2pYBbR2PhSTdYtR0Q=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=caydE4D7BB4N2+z9SH3RzqkhTju1l38tk2+14B6bJZpzeCIV5UqkEn4ELnmdk2kx/Nxai/UjVeqXW/ba+PbM5RVr05pLn8SWNzV8f3wEzp2eMtlQrTxHQQyetVOUH9VT8I/FhKjjttlNopKDLa+REjqqaiTlGQJzT4d/8DBSep4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=SUbxeS22; 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="SUbxeS22" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A6B2AC2BC86; Sun, 1 Mar 2026 17:43:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772387011; bh=BNmBp855yDuZHxGokx46EelosP2pYBbR2PhSTdYtR0Q=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=SUbxeS2211g8wN7uLQz6h9AuTbom7ZZgcCc6z5itDrzXT5tpiKoAfwCKWKYAFRrqR 1GaBLxPbwQseaYRjzrdebGBNebNJS5sKMbh1zui3pCpBozkaVHzrzYEFCG6SppXaYe 1InjYimjb06EgYOFJmlm2eVKtRNipbDRS+Nt5Ahd5o4Su/CXgWRmp2Y0J/GNTh8HnE D7zKJd8QVVQUjFkAJSiqyQs9XnlJ3pTfdnMTfluB7bQ3gkbYbn+jrYmAV5N6VPlTyk zAUzoYG8Rgy1HFNjA2N1aQMvbexshtnP78n8u/mxiG6CrNWN8SmxXjhyVgmg8kTE8+ QQ7xqekehkSHw== 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 02/10] mm/damon/core: add damon_new_region() debug_sanity check Date: Sun, 1 Mar 2026 09:43:17 -0800 Message-ID: <20260301174327.76849-3-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_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; } +#ifdef CONFIG_DAMON_DEBUG_SANITY +static void damon_verify_new_region(unsigned long start, unsigned long end) +{ + WARN_ONCE(start >= end, "start %lu >= 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 start, unsigned long end) { struct damon_region *region; + damon_verify_new_region(start, end); region = kmem_cache_alloc(damon_region_cache, GFP_KERNEL); if (!region) return NULL; -- 2.47.3