From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mta1.migadu.com (out-52.mta1.migadu.com [95.215.58.52]) (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 EB14E3E9C2F for ; Fri, 4 Sep 2026 08:30:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.52 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788510645; cv=none; b=EXluMqF2mkCRnOaCLluB1iZB+o8B980zqQdzhmp5BUf9wQHjvkJPynileZA8zMa0CTbLXfX9+Rfd7FN0eWuLswIx2ON4oS0ZOo34Ca4X4PnSyv0lkYPm7imkiNhXIKF44PjoP9YhZASe2lrE6PsVBAMVwQ9Ctm0eRN0+HXCUHjM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788510645; c=relaxed/simple; bh=CFKM/oXZIBvw0BqE9/5yiGP7kLeCWI/z9w+COmstMmA=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=B8FPOrZdsweDmj2fJwAwWMNepVKE+x6JcgTaD87ZPhRsb+Cy9a54cM9vdYVSuFtUgBsosLnDuW1LF4ZpA2RvYiSl9RVCYBkDBh1ppF5hlJ8eThlqfR7WAsuM45ICJH3PNsP2kaYf36fNxAodGAn2HTzTE2npKMXjyfWHagCHC+I= 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=Y6etWUM1; arc=none smtp.client-ip=95.215.58.52 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="Y6etWUM1" X-Envelope-To: linux-kernel@vger.kernel.org DKIM-Signature: a=rsa-sha256; bh=CFKM/oXZIBvw0BqE9/5yiGP7kLeCWI/z9w+COmstMmA=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1788510641; v=1; x=1789115441; b=Y6etWUM1RMTIvN2P7dw85Fry5LCC8U/8IwkjsGKpzZQZ7T/bJLz9a9/zCvGZYb+OTdKWdVgf voYRKhnzo7SqYxeWTyHQYfoCRO4CrvSdP6BxvWFyKzg4YnnlP41WXvyQcRPO7KpwsWcopcZ09ej HKw1kKmkJa+Ll46FKmaK+SqY= X-Envelope-To: linux-kernel@vger.kernel.org Received: by smtp.migadu.com with ESMTPS id 4ff74a31b6f5cb41; Fri, 04 Sep 2026 08:30:41 +0000 X-Mizu-Trace-ID: 4ff74a31b6f5cb41 X-Migadu-Flow: FLOW_OUT From: Ye Liu To: Miaohe Lin , Andrew Morton Cc: Ye Liu , Naoya Horiguchi , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH 4/8] mm/memory-failure: convert process iterator to for_each_process_rcu Date: Fri, 4 Sep 2026 16:29:56 +0800 Message-Id: <20260904083001.553587-5-ye.liu@linux.dev> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20260904083001.553587-1-ye.liu@linux.dev> References: <20260904083001.553587-1-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() pairs combined with for_each_process() loop in mm/memory-failure.c with for_each_process_rcu(). No functional change. Signed-off-by: Ye Liu --- mm/memory-failure.c | 16 ++++------------ 1 file changed, 4 insertions(+), 12 deletions(-) diff --git a/mm/memory-failure.c b/mm/memory-failure.c index a8b03e2920ba..63a2ff08ee33 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -555,8 +555,7 @@ static void collect_procs_anon(const struct folio *folio, return; pgoff = page_pgoff(folio, page); - rcu_read_lock(); - for_each_process(tsk) { + for_each_process_rcu(tsk) { struct vm_area_struct *vma; struct anon_vma_chain *vmac; struct task_struct *t = task_early_kill(tsk, force_early); @@ -572,7 +571,6 @@ static void collect_procs_anon(const struct folio *folio, add_to_kill_anon_file(t, page, vma, to_kill, addr); } } - rcu_read_unlock(); anon_vma_unlock_read(av); } @@ -589,9 +587,8 @@ static void collect_procs_file(const struct folio *folio, pgoff_t pgoff; i_mmap_lock_read(mapping); - rcu_read_lock(); pgoff = page_pgoff(folio, page); - for_each_process(tsk) { + for_each_process_rcu(tsk) { struct task_struct *t = task_early_kill(tsk, force_early); unsigned long addr; @@ -611,7 +608,6 @@ static void collect_procs_file(const struct folio *folio, add_to_kill_anon_file(t, page, vma, to_kill, addr); } } - rcu_read_unlock(); i_mmap_unlock_read(mapping); } @@ -635,8 +631,7 @@ static void collect_procs_fsdax(const struct page *page, struct task_struct *tsk; i_mmap_lock_read(mapping); - rcu_read_lock(); - for_each_process(tsk) { + for_each_process_rcu(tsk) { struct task_struct *t = tsk; /* @@ -653,7 +648,6 @@ static void collect_procs_fsdax(const struct page *page, add_to_kill_fsdax(t, page, vma, to_kill, pgoff); } } - rcu_read_unlock(); i_mmap_unlock_read(mapping); } #endif /* CONFIG_FS_DAX */ @@ -2288,8 +2282,7 @@ static void collect_procs_pfn(struct pfn_address_space *pfn_space, struct address_space *mapping = pfn_space->mapping; i_mmap_lock_read(mapping); - rcu_read_lock(); - for_each_process(tsk) { + for_each_process_rcu(tsk) { struct task_struct *t = tsk; t = task_early_kill(tsk, true); @@ -2303,7 +2296,6 @@ static void collect_procs_pfn(struct pfn_address_space *pfn_space, add_to_kill_pgoff(t, vma, to_kill, pgoff); } } - rcu_read_unlock(); i_mmap_unlock_read(mapping); } -- 2.25.1