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 7DF7E314A83; 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=jMpNntIrQIB+uh/UB1AAT/hyVkcjRzSFJTF1lrnLDAJppFSkZDXYFGk+JyiWeC835lRMxcraeY/nYWEOrhY56EXPLyzRYUUHzm88EqL4Wzt+SqOpdW9WHEXx/i59X0onNmH9OsTm6vacw0ZGgTptRr3r1kHMkBMrT/GhG3ptFuY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771702595; c=relaxed/simple; bh=I8vgGzFmn9eOAxp25MVWasYsGVVIm8Br+R7YY0e17Wg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=mfTJak7NRV7VxzInpwOXuSTqq753ysWt0fL8rB7BXKNqespLT9B9KtnRAJ3M5jkhCBUwn08FCb1TX65Avh/Vbi6XlmcGVVIuyZ/hpuhq2egrlyoATfH1fhnyqWO9DM3ZjfbMu5uGFiHyn7KAEexhvNLBN/DSxR139LK7REDu+Io= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=k+72ZuX/; 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="k+72ZuX/" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 10AF2C2BC9E; Sat, 21 Feb 2026 19:36:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1771702595; bh=I8vgGzFmn9eOAxp25MVWasYsGVVIm8Br+R7YY0e17Wg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=k+72ZuX/URzHsMuAN+fknl+2ID4qfoFDQn3AZe8rUqgJu5ygA/+FDLFEpgXnoBds+ J2Uf9ypx2huS+b6oURZLEquamH70DT70inxL8Wszswem0BkIrwPjbwVXhFnnP8h2NJ uqTI/kCmCFOd0xwr5CF4JbHUUCJX1z5YI9cSAE39G9RgDnPWhbBqQRTE60DrGcyC6j bIdQxBe+P09rlDSLGaprGs6UmENL/MhYNxVsl2+VG0StOzDK0nZO9CHruaz/Ybi09b EOLzZignmqx3ExNAaewSGm/3kx4guwjE/qZBdFU6Qvws+hwOcbrQ2D+rII4qq8Y1E2 eDtlfGIfpHYkg== 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 03/10] mm/damon/core: add damon_del_region() debug_sanity check Date: Sat, 21 Feb 2026 11:36:20 -0800 Message-ID: <20260221193629.19332-4-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_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 | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/mm/damon/core.c b/mm/damon/core.c index a7f5748c1fe17..7e03c3af03694 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -158,8 +158,25 @@ 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) +{ + if (t->nr_regions > 0) + return; + pr_err("damon_del_region() called while t->nr_regions <= 0 (%u)\n", + t->nr_regions); + WARN_ONCE(); +} +#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