From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mta1.migadu.com (out-178.mta1.migadu.com [95.215.58.178]) (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 5CF6A43E088 for ; Mon, 7 Sep 2026 08:14:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.178 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788768874; cv=none; b=DMBvhIgXANzjEmNo707EVlztzIuOM4VHPb3tzTO9Nbvuf5Ze/PKsdj4PIii7W3RZ31AuV1O46E/f1izevkEN8yIc/W0l4uvXcnUwluD+sJyUiyOsuSAm1+XX7v6skkRDXVibNFJXX9mQfllZ9D73hFOmMi4MCv8QaGb5aFOa/VA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788768874; c=relaxed/simple; bh=6kM1mhZIXKCqG82ZEU8Zg2E+W3wWN+Noa5dvNKDqX9Q=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=ierGPrRq8CrIArpj6ST0Mcumna0SoAiCC+7UR7RTZ4aluFjq7Js//PKPDhgIbxCkr/rebadTVGXg4t2L2DXh8j3cijLcPFU89AIr139Qy7mTRoZva6dJa7BB4L7dSGyfDnYGrQu3nQBNRJft7GBKhdsgNeNCZL80gNZLaIDG96o= 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=ZvPkgP2F; arc=none smtp.client-ip=95.215.58.178 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="ZvPkgP2F" X-Envelope-To: linux-trace-kernel@vger.kernel.org DKIM-Signature: a=rsa-sha256; bh=6kM1mhZIXKCqG82ZEU8Zg2E+W3wWN+Noa5dvNKDqX9Q=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1788768870; v=1; x=1789373670; b=ZvPkgP2Fu8+dLz7vuNh0ZXNRI/3Xkce1w83Ow9eDgzk8wZiUBAX5GdAWblwtd0uZdJJPCqOh qoCXY5iCyybkPiYAq5lYeyko0X9lM2vMsawXPcxzgznHCuL+8XY+LxUrdyL4U6GaGqTjLIXr5sj RwtYzqr2GoktBWfscpHrqXyo= X-Envelope-To: linux-trace-kernel@vger.kernel.org Received: by smtp.migadu.com with ESMTPS id 2731654c1e840797; Mon, 07 Sep 2026 08:14:28 +0000 X-Mizu-Trace-ID: 2731654c1e840797 X-Migadu-Flow: FLOW_OUT From: Ye Liu To: Andrew Morton , David Hildenbrand Cc: Ye Liu , Michal Hocko , SJ Park , 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, ljs@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, 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 v2 3/8] mm/ksm: convert process iterator to for_each_process_rculock Date: Mon, 7 Sep 2026 16:13:29 +0800 Message-Id: <20260907081334.1152889-4-ye.liu@linux.dev> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20260907081334.1152889-1-ye.liu@linux.dev> References: <20260907081334.1152889-1-ye.liu@linux.dev> Precedence: bulk X-Mailing-List: linux-trace-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 --- 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