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imf11.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b="nNazy/7c"; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf11.hostedemail.com: domain of arnd@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=arnd@kernel.org ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1781182630; b=6DAxkNhRmTMCDLzc4JDzGdgPs+mHyr8L21bCDbqmGKyJLBt/5H0knEGkH/kvboc7UMeY4J W/w725ShiKuwa8ZANRhbzN6KTnxmRqx2+4ac0X1rAYqo9thPS5NxO9Kkx8hVPG/4TtnDZw a3W4tzJ1gFHwh12YUOEk3UOxeY7gt7M= Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id DD9546001A; Thu, 11 Jun 2026 12:57:09 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D0E5C1F00893; Thu, 11 Jun 2026 12:57:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1781182629; bh=geNwV4XsDcpW2nLuNQos/NDgwcU9+p+h0p71pBEkqdc=; h=From:To:Cc:Subject:Date; b=nNazy/7cpWAhMsGMZlG/ZznSRm6J7bfXp371Q8zmoJkEJWAokjfzD9k8J+LG7tk2b N2o9B//dFurcQjRQqqjjwo8tXElpWAt1rrbfIM8+507W8El7JAA0VnzgkVqfOFPK// OvRLWiVMeOX0O94sVIHJEtTGmE1I+T/cw3XruxlZlKAkjovqHp87erfzqmCveCuZQ4 SBHHCR+55dw4RLRS5eE+WHgizUoTrpUE9rp387H/ZNalmljdajI+O4zLkIJ5vd461t GVrDtLHenw8CNVJ3Yx73uhq4C3/yrX+9jrDWqp0UBo4QHwP/f4eK8ZhQ0tIHEMWhI3 B34t1OZ76bnnA== From: Arnd Bergmann To: SeongJae Park , Andrew Morton , Nathan Chancellor Cc: Arnd Bergmann , Nick Desaulniers , Bill Wendling , Justin Stitt , Ravi Jonnalagadda , Quanmin Yan , damon@lists.linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org, llvm@lists.linux.dev Subject: [PATCH] mm/damon/core: reduce kernel stack usage Date: Thu, 11 Jun 2026 14:56:57 +0200 Message-Id: <20260611125704.3386176-1-arnd@kernel.org> X-Mailer: git-send-email 2.39.5 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 5D1084000A X-Rspam-User: X-Stat-Signature: 47m9e5dir5sn89w8hxkpeh6mp1roeqye X-Rspamd-Server: rspam09 X-HE-Tag: 1781182630-548301 X-HE-Meta: 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 4Ma8+btD p6ebh6fm0ScnCo2W0nGk+TtFFDwl9GFVcSBkd8iHeLqSgSZnfVmoviCkotYTmVspWzYd8zQ45wJr1RRHWzoQGp2RJGcXqcbdJb0uoZOyxRUBU+L/Xuor92ksjAaojeVySJypeSyBKSj3UyOVVQmowm49Q7Zz3ux5/YGJHMXiE1vUpMdA3K7MIAVxKRplU5e1d2Qxe0fMzMFb92XznWoX+xlqQXlmQVnARQj5JdYihcAEWSSgR4qOZLBX3iiL/v8yqvEtPM11zIGyyhKiJx6YriMQTS2hXy5uvfHNHD7I8NyhXkEmLW3Yi8N0mJwnE1SjSpYO3 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Arnd Bergmann The main thread function has recently grown to the point of exceeding stack frame size warning limits in some configurations. This is what I hit on s390 with clang and CONFIG_KASAN: mm/damon/core.c:3440:31: error: stack frame size (1352) exceeds limit (1280) in 'kdamond_fn' [-Werror,-Wframe-larger-than] 3440 | static int kdamond_fn(struct damon_ctx *ctx) The largest stack usage here is inside of the kdamond_tune_intervals(), so by marking that one as noinline_for_stack, the functions individually stay below the warning limit, though kdamond_fn() itself still uses hundreds of kilobytes for some reason. Signed-off-by: Arnd Bergmann --- mm/damon/core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/damon/core.c b/mm/damon/core.c index 265d51ade25b..69f38c48ac08 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -2002,7 +2002,7 @@ static unsigned long damon_get_intervals_adaptation_bp(struct damon_ctx *c) return adaptation_bp; } -static void kdamond_tune_intervals(struct damon_ctx *c) +static noinline_for_stack void kdamond_tune_intervals(struct damon_ctx *c) { unsigned long adaptation_bp; struct damon_attrs new_attrs; -- 2.39.5