From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mta0.migadu.com (out-93.mta0.migadu.com [91.218.175.93]) (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 5EDC2434997 for ; Fri, 11 Sep 2026 07:59:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.93 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789113551; cv=none; b=sEtjywbTsP737gO5gOrybwQVGCNqUCkHkDnRZF+PbHta4YpRLofUT75koceEhlCNx0khz0/pn5r93hwQPpqWBVbaibM6zdvXSUQ/q2EUevooCNJbIsbzqkVLsSZRx5XuwM7ai6DWmDrdcMZU78P5vTfbFsR8G5Ws6b4PK4OvNEc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789113551; c=relaxed/simple; bh=QXWV2YjR1N2qilXRn4ZL7vqePEkKN4kK8nW2DqNMaW0=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=ZukPqpQgoanWqwcFalkK9wm71zW2NTzTxDvqqkI5ceQzi/0xMYQJLiWXbIJeo+pOacCOSP6TLJ09bKc8RHIqaIpChAKXkZ3R0DsCjsTqjDAB7DrLMu9Rf4SBSCF+yV3LoPIH7M3QjQtegdrXVY2DvCmpc9mhm5FJpXL8GPxbMos= 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=c0Y8MbTy; arc=none smtp.client-ip=91.218.175.93 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="c0Y8MbTy" X-Envelope-To: linux-security-module@vger.kernel.org DKIM-Signature: a=rsa-sha256; bh=QXWV2YjR1N2qilXRn4ZL7vqePEkKN4kK8nW2DqNMaW0=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1789113546; v=1; x=1789718346; b=c0Y8MbTyqfpSZ2DWWP9DK8EZ8QtF2s849JagY4PO/RE9wqhVppJ1E/yY0JVz/zjdRmy2F9zY Mu2RRMS1hxZz+253id6FTq1DsfkUAgKRkpc1isSOINba5LI7N/p2QsvYnl6N0pJ1jzDmhCyEyNa m5IAgpZM1iVKkwqy5ZmSRadE= X-Envelope-To: linux-security-module@vger.kernel.org Received: by smtp.migadu.com with ESMTPS id 70c9cc29d1278767; Fri, 11 Sep 2026 07:59:05 +0000 X-Mizu-Trace-ID: 70c9cc29d1278767 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, 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, 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 Subject: [PATCH v3 03/15] mm/ksm: convert process iterator to for_each_process_rculock Date: Fri, 11 Sep 2026 15:57:48 +0800 Message-Id: <20260911075800.491472-4-ye.liu@linux.dev> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20260911075800.491472-1-ye.liu@linux.dev> References: <20260911075800.491472-1-ye.liu@linux.dev> Precedence: bulk X-Mailing-List: linux-security-module@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) --- Changes in v2: - Rename *_rcu to *_rculock 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