From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm2-f12.google.com (mail-wm2-f12.google.com [74.125.225.140]) (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 B208F4D37BA for ; Thu, 17 Sep 2026 11:28:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.225.140 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789644497; cv=none; b=eVDo2xaHGORBGmUecBm2U75od9b4/h7NPYxM0YtnyTjsirePYcln4px/+NaRZjfoKrQboEE+PyZil1jV7uFEo3Yl/0vkyAMMZ4WNu+fJ6V+M29yuOeXogbgpFKqskkRQQO/jtAHwqjk6GSVwT3eRGo4QJIsRxdULr/VGJ3eXHEY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789644497; c=relaxed/simple; bh=rkbgMLuM3vm0QjSeOouBx6sDtJtxGAt8tN51h/k1Emg=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=mouh8PxnDSmDq9Lv3uxKJGmRFKpJKLuMPP42KppkRWrrGYnEzSEYd2WFgVjC4HRIlnt0LhBunrzYyFwGIzzbPRHzrHjItoTOLNeejECzeeeNplPxgN6bn5peoBUUedDQUC9Ih9N+8kfNpwPQsgY0/hx8ujFKrgWxh3Ssga5zX5Y= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=suse.com; spf=pass smtp.mailfrom=suse.com; dkim=pass (2048-bit key) header.d=suse.com header.i=@suse.com header.b=cBiVsMop; arc=none smtp.client-ip=74.125.225.140 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=suse.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=suse.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=suse.com header.i=@suse.com header.b="cBiVsMop" Received: by mail-wm2-f12.google.com with SMTP id 5b1f17b1804b1-49e66390995so3854515e9.2 for ; Thu, 17 Sep 2026 04:28:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=google; t=1789644493; x=1790249293; darn=vger.kernel.org; h=in-reply-to:content-disposition:content-type:mime-version :references:message-id:subject:cc:to:from:date:from:to:cc:subject :date:message-id:reply-to:content-type; bh=cPQWIr4fS6DSXVaIcQLRpggCO3UERblx+k2pBWKEiyY=; b=cBiVsMopEYxIp2v4ZQ0BZHIhPOhv1WkhfZIuu4HsqqQK2T4j917iiq1KN5c/fsjADH Lb/DrZRbp2YE8jKyKg5brHB8Ei8fXa9RRsZYJOu9PUMNXzPqiuM3h4y48c4CxnqggowI n9DZLWnAay7DQn4gweYncMCfKk8vjh+xGoxaFlpQF5t1SeWlXGSrVkG/lR8LmI6At+OT csDVDcxzQJx+0jpORA4Dm24qTlXpudp0AMa3Giks29Rq7Zdn7cEI92OQDOoXbs34Nl4U nIxCQyu9PJWh+fO+c4nhXpeAdIWHLIegu4mkkX+nSSnf5HlFlhml2wWtXm6vKZBOhzmk RjpA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1789644493; x=1790249293; h=in-reply-to:content-disposition:content-type:mime-version :references:message-id:subject:cc:to:from:date:x-gm-gg :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=cPQWIr4fS6DSXVaIcQLRpggCO3UERblx+k2pBWKEiyY=; b=lMPSIKxpn3blEPRJ38aPxiDx1dlnXPydL8r0/ezVggPcsTXtFYdoOMyNTBvkyu7nYw CfgqkmMCS4ro5Y+EpZplFYoHmX65bzsT5pd8I2bOy4rxEZtXPjAJNs3Gi7pKlR+HpvU3 wN6H7IpCVXtpOYS2cTfaO+EDK1IafMSm6q4FXXmFxhlaPMbipRyNMYNEBeT9U0uhVumD pBdw7LM9G69DDqgDk7nY2ARNa1KBEcy9B2+qsUrOXawr+bnHKzMcyE3SiKBrbX9YIt7b PHn9ZprDXkpEBZO72w3F9FBEPiDj/IdfYi/2DD/eH84aCuFIuVPD3o2Om6rE6dQ1p4Ol 03Sw== X-Forwarded-Encrypted: i=1; AKwUvBwvrKqOkEQoFH8ZMELO45ccn2XQZk4NceleRzSLvMyu0cIifL6bjaxLviwX6vc92x/wDPVn+Qmd9hssIE0=@vger.kernel.org X-Gm-Message-State: AFuF++kIGWW4QOKATnz7YQz+gSVcPc0/2GQGEL1YNv7AdoOLTaKjEpXC DfaCs2tQvjLXCyg4owqYGJv3CWoW+mZtSihM24Q8ElXkFRj+KDt/U0e41DtZTmrWaqU= X-Gm-Gg: AYBFou0K+651ldtH33914Kgn4OSeJ71vYXrXgvg5nOywKd8YCGN3boMq8JmSp8/5v63 D2uoZja0qDocpsR8nF937Nf1zQrtLkHbD5EQLdJkzcpe8rQAoY9bBwc1nRVTUgLaDCMCMmivo4E 3quzga7aYGuHWXCYv8UIjsmVJZixuEiX5+xq/fhKPm3rt2yQjh5U8Uxz6JKY0gVRQEEGd64SEpA v/b5jlTxRVlumxnD8ifLPoD++oD8L4xGZhATY2BOBA33HvWOkLOgYHX8cQYIH8VZL5Zp5zKVX3W oK5fGZWyHIpBGYCcYuIpdNe01eg520KfxEOtomdyJj3yS21zxpLQ9Xszl7/f4z1WtZoAjdpHh4Q dTn5euf4bcOrsE5vi/dl9F9j3hPRTwsd8kHsG5c3dA5JQaPLml9vvaK0Ym3is1J24I+/qB/0w2T EvQaHFWGdQ++GtkCkV+5KPdYm7h6JMLQ/OyINc7Pur0lVeP7VbC5D7dl13LgFAgngNAM++4yYO4 g== X-Received: by 2002:a05:600c:8a17:20b0:49f:bd0d:59f5 with SMTP id 5b1f17b1804b1-49fbd0d59fbmr28486785e9.18.1789644492945; Thu, 17 Sep 2026 04:28:12 -0700 (PDT) Received: from pathway.suse.cz ([176.114.240.130]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-4870bf34440sm14542597f8f.25.2026.09.17.04.28.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 17 Sep 2026 04:28:12 -0700 (PDT) Date: Thu, 17 Sep 2026 13:28:09 +0200 From: Petr Mladek To: Jinjie Ruan Cc: bcrl@kvack.org, viro@zeniv.linux.org.uk, brauner@kernel.org, jack@suse.cz, tytso@mit.edu, adilger.kernel@dilger.ca, libaokun@linux.alibaba.com, ojaswin@linux.ibm.com, ritesh.list@gmail.com, yi.zhang@huawei.com, sforshee@kernel.org, akpm@linux-foundation.org, rostedt@goodmis.org, andriy.shevchenko@linux.intel.com, linux@rasmusvillemoes.dk, senozhatsky@chromium.org, kees@kernel.org, tglx@kernel.org, linux-fsdevel@vger.kernel.org, linux-aio@kvack.org, linux-kernel@vger.kernel.org, linux-ext4@vger.kernel.org Subject: Re: [PATCH v3 2/8] lib/vsprintf: Use acquire/release for ptr_key publication Message-ID: References: <20260902074805.398540-1-ruanjinjie@huawei.com> <20260902074805.398540-3-ruanjinjie@huawei.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260902074805.398540-3-ruanjinjie@huawei.com> On Wed 2026-09-02 15:47:59, Jinjie Ruan wrote: > Replace the smp_wmb() + WRITE_ONCE() and READ_ONCE() + smp_rmb() barrier > pair with smp_store_release()/smp_load_acquire() on filled_random_ptr_key. > > This expresses the publish/subscribe pattern more clearly and allows > architectures with native acquire/release instructions (e.g. arm64's > STLR/LDAR) to avoid the cost of full one-way barriers (DMB ISHST/ISHLD). > > No functional change intended. > > Cc: Petr Mladek > Cc: Steven Rostedt > Cc: Andy Shevchenko > Cc: Rasmus Villemoes > Cc: Sergey Senozhatsky > Cc: Andrew Morton > Assisted-by: DeepSeek:DeepSeek-V3 > Signed-off-by: Jinjie Ruan JFYI, this patch has been committed into printk/linux.git, branch for-7.3. Best Regards, Petr