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 55F8A337B97; 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=mT+ZuR/zYewj5r+IulspBTSw9CtGNlwQqEYQFZCTPDlcnoxela6cNg5OqPAn0oU/ydORXVAzgjD1pDC+N6za6sNKEQa8YD3I9a+aRevn5sTIaOGFGmG3N4EIGLTAIDVut5lTckGFAuYpFmMpxQaNzLJL3q1hXnXIxHAqhlkS4PE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772387012; c=relaxed/simple; bh=zFDrPDtcwfulSyFJOaJh2lietZw1gfebL6litU0OglA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=oxRlwSpT5KgHrFnowodtP6rq5QtP71z6mVxQACyigR/QqN/Vsd4y/LTlPdj2YLQzEJDnKje453Wo+CabwilDsQATK1VY07iAX/3NeV+JacmYU01dRNb+ZSKsLCp5JAk35klVQ/YIOb2eig2iXbApdQYLF0kt+p75FmUUNIvwOAY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Nd9OgLsT; 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="Nd9OgLsT" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1A768C2BCB4; Sun, 1 Mar 2026 17:43:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772387012; bh=zFDrPDtcwfulSyFJOaJh2lietZw1gfebL6litU0OglA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Nd9OgLsTu3ecaX5TcXHYptFLk841w3Y6SNtOGO/WiO3U5igWi7VKyhQGO+0xY/IZN CB1lRMIvdtpVfffuXIwuEoEAOEJrnomYD6d/Y9qNcWbdwcZtBUkqVxccMqOAdUdkYD DAe7rt6WxIetT6oStd5OPJRULSsWArXOSzyoHwDWXHeHiOJMTp+66u5FfatpQamtVy jFGNA7UirHT7L9w2YY07scAmlguyKpWM1yXN7kwb0LFhSs0rnztQlQsTRxhK/wYU76 s3HNbVT9S6htzjOSyrA2Exvb6Jg44UZMlxWlXzaesVddxPIqenY4heH0E/jPhNBMyD Wq+6dZgV8XiRA== 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 04/10] mm/damon/core: add damon_nr_regions() debug_sanity check Date: Sun, 1 Mar 2026 09:43:19 -0800 Message-ID: <20260301174327.76849-5-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_target->nr_regions is introduced to get the number quickly without having to iterate regions always. Add a sanity check for that under CONFIG_DAMON_DEBUG_SANITY. Signed-off-by: SeongJae Park --- mm/damon/core.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/mm/damon/core.c b/mm/damon/core.c index 92eac5eb96026..2b5aed89d449d 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -545,8 +545,27 @@ void damon_destroy_target(struct damon_target *t, struct damon_ctx *ctx) damon_free_target(t); } +#ifdef CONFIG_DAMON_DEBUG_SANITY +static void damon_verify_nr_regions(struct damon_target *t) +{ + struct damon_region *r; + unsigned int count = 0; + + damon_for_each_region(r, t) + count++; + WARN_ONCE(count != t->nr_regions, "t->nr_regions (%u) != count (%u)\n", + t->nr_regions, count); +} +#else +static void damon_verify_nr_regions(struct damon_target *t) +{ +} +#endif + unsigned int damon_nr_regions(struct damon_target *t) { + damon_verify_nr_regions(t); + return t->nr_regions; } -- 2.47.3