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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-ext4@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