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 46ACE337B8F; 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=1772387012; cv=none; b=bIm7hxnDGnyXC38hCgrOmZBwQhGn5YuiQNUMfWXY6/H76RBF6jT723Pk7OgTVl99vI177Aa/7Lu1usOJ8wOIRsAdxRa6BJQJVDn6Pb/HXCKT+CM4sGian8leD3ZJZBlvoGFLsRCWDhCVmV+Zfmt0hnqkerkh2eMsbur0vFgzG8s= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772387012; c=relaxed/simple; bh=h0Fe5csr3sldzD6TLO83VPiRoEMNSXNoD5pNU6aZzIs=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ELdXBLhruJ6umwY1XBOQhtSWiOG4TqrdE8Zy91UUzFsCGVXV/ajfQbeRaVOJDPI+uT7XGw8GvYlepFBSevG+Se83vGMZ60dud0YdGpEW2hh/hrj0n00Ypi5Onzu//EjQc+lqNf/7flgSk44+ryp63kdfCJ1AXyXeUCThrU4/uPA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=lO29yu2E; 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="lO29yu2E" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DAC9CC2BCB2; 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=1772387012; bh=h0Fe5csr3sldzD6TLO83VPiRoEMNSXNoD5pNU6aZzIs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=lO29yu2ESlUHUzzR1nxvpCUFW3x9kKowPe+dexg3bbPFDyTPyO1qAg5OlX63GVDZJ 6QX+67cOGEcsKE/cM/xng61jC257qS2nQr8mAcDiSo3rGdV4S64yuB/TfZAlsG1t/6 FRUxCmpee3sP7q1l8PPnjz88byam8eUUxpahEtKo3v1BNgexzauiThP7xbWlE2Cyig TiapquwJwPYGpazfGQ2LUtRaJ8UwgkQRoqb7YVE3sNU1I2oAUh0tfz0Iytyl2Zqs53 66WyiSxAO/9BFrtpN3hcC/7Y2MFNIJQgeYLLTun6fIU+C5SS8Lb3kpWJy3sfXZxHIR GOb29K2ZilHng== 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 03/10] mm/damon/core: add damon_del_region() debug_sanity check Date: Sun, 1 Mar 2026 09:43:18 -0800 Message-ID: <20260301174327.76849-4-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_del_region() should be called for targets that have one or more regions. Add a sanity check for that under CONFIG_DAMON_DEBUG_SANITY. Signed-off-by: SeongJae Park --- mm/damon/core.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/mm/damon/core.c b/mm/damon/core.c index 0c1353164ec81..92eac5eb96026 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -152,8 +152,21 @@ void damon_add_region(struct damon_region *r, struct damon_target *t) t->nr_regions++; } +#ifdef CONFIG_DAMON_DEBUG_SANITY +static void damon_verify_del_region(struct damon_target *t) +{ + WARN_ONCE(t->nr_regions == 0, "t->nr_regions == 0\n"); +} +#else +static void damon_verify_del_region(struct damon_target *t) +{ +} +#endif + static void damon_del_region(struct damon_region *r, struct damon_target *t) { + damon_verify_del_region(t); + list_del(&r->list); t->nr_regions--; } -- 2.47.3