From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mta1.migadu.com (out-249.mta1.migadu.com [95.215.58.249]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0CBE346984A for ; Mon, 21 Sep 2026 09:22:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.249 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789982534; cv=none; b=lB4p7Jmvu6h1mKMDzj+bHq+xee+JWievvVInqu+7rgpB+/fhlFUKJ1LSA6ZFiSUuyhl/f3gFo4WqN93k1RLHuFOp3eORG1xyf0Vo7dlVyb82JivVTdhJ/yH6oF6cWe88qEyXS4nbBQRawJCh4LS2KcvV7RpwcUU1Gao/y19Zr6I= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789982534; c=relaxed/simple; bh=gg1y5J6wvSizwC3gFVsggog4FN4dVg6+drI/OX9nv8o=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=s3LY2M72tuGLm99Fi0zygpK9nxtTG4ma/Tywfx06v0BQ73Gf6AakO8UO1NCNL/yFBKSSCL9EAopHgEB9p7c7njbSEIIHMi154DiER4b0N3g2SEY/ZE2QW4Rwf4vES6tiQFxu7yOxNU6UHc8JDb2yCUCbJb31bBeTKfHkQPtVZuQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=W7g7jKUi; arc=none smtp.client-ip=95.215.58.249 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="W7g7jKUi" X-Envelope-To: linux-kernel@vger.kernel.org DKIM-Signature: a=rsa-sha256; bh=gg1y5J6wvSizwC3gFVsggog4FN4dVg6+drI/OX9nv8o=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1789982530; v=1; x=1790587330; b=W7g7jKUizUZ9nspF8xvE7oYsI/6MDEC4F4BT8uIYNpkqMBgCYm1VKABuvLzzX5xk6GihvnW4 Kba7Ddtk9hkKw4FFRsLyKYYAw67zyJSYsLaBSJh4VYgtSi44SsgivNbGm+njg1Hdob9GtvFRhHQ 2zpF6qEh/rZTncHiI6WOhct8= X-Envelope-To: linux-kernel@vger.kernel.org Received: by smtp.migadu.com with ESMTPS id e1e273a490565660; Mon, 21 Sep 2026 09:22:09 +0000 X-Mizu-Trace-ID: e1e273a490565660 X-Migadu-Flow: FLOW_OUT From: Ye Liu To: Andrew Morton , David Hildenbrand Cc: Ye Liu , Michal Hocko , SJ Park , Gregory Price , Lorenzo Stoakes , peterz@infradead.org, paulmck@kernel.org, mingo@redhat.com, rostedt@goodmis.org, jpoimboe@kernel.org, mic@digikod.net, oleg@redhat.com, tglx@kernel.org, linmiaohe@huawei.com, nao.horiguchi@gmail.com, rafael@kernel.org, gnoack3000@gmail.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, rcu@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-security-module@vger.kernel.org, rientjes@google.com, shakeel.butt@linux.dev, xu.xin16@zte.com.cn, chengming.zhou@linux.dev, will@kernel.org, boqun@kernel.org, frederic@kernel.org, neeraj.upadhyay@kernel.org, joelagnelf@nvidia.com, josh@joshtriplett.org, urezki@gmail.com, juri.lelli@redhat.com, vincent.guittot@linaro.org, tony.luck@intel.com, reinette.chatre@intel.com, x86@kernel.org, paul@paul-moore.com, jmorris@namei.org, serge@hallyn.com, pavel@kernel.org, lance.yang@linux.dev, mhiramat@kernel.org, pmladek@suse.com, longman@redhat.com, mathieu.desnoyers@efficios.com, jiangshanlai@gmail.com, qiang.zhang@linux.dev, dietmar.eggemann@arm.com, bsegall@google.com, mgorman@suse.de, vschneid@redhat.com, kprateek.nayak@amd.com, mark.rutland@arm.com, Dave.Martin@arm.com, james.morse@arm.com, babu.moger@amd.com Subject: [PATCH v4 03/15] mm/ksm: convert process iterator to for_each_process_rculock Date: Mon, 21 Sep 2026 17:20:49 +0800 Message-Id: <20260921092101.89285-4-ye.liu@linux.dev> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20260921092101.89285-1-ye.liu@linux.dev> References: <20260921092101.89285-1-ye.liu@linux.dev> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Ye Liu Replace the manual rcu_read_lock()/rcu_read_unlock() pair combined with for_each_process() loop in mm/ksm.c with for_each_process_rculock(), which scopes the RCU read lock to the loop body via scoped_guard(rcu). No functional change. Signed-off-by: Ye Liu Acked-by: Michal Hocko Reviewed-by: SJ Park Acked-by: David Hildenbrand (Arm) Reviewed-by: Gregory Price (Meta) Reviewed-by: Lorenzo Stoakes (ARM) --- mm/ksm.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/mm/ksm.c b/mm/ksm.c index 49d48d1e0998..69d30e80a090 100644 --- a/mm/ksm.c +++ b/mm/ksm.c @@ -3280,8 +3280,7 @@ void collect_procs_ksm(const struct folio *folio, const struct page *page, struct anon_vma *av = rmap_item->anon_vma; anon_vma_lock_read(av); - rcu_read_lock(); - for_each_process(tsk) { + for_each_process_rculock(tsk) { struct anon_vma_chain *vmac; const unsigned long addr = rmap_item->address & PAGE_MASK; const unsigned long index = rmap_item->linear_page_index; @@ -3298,7 +3297,6 @@ void collect_procs_ksm(const struct folio *folio, const struct page *page, } } } - rcu_read_unlock(); anon_vma_unlock_read(av); } } -- 2.25.1