Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Mon, 12 Mar 2018 14:31:35 +0100
From:   Peter Zijlstra <peterz@infradead.org>
To:     =?utf-8?B?54Sm5pmT5Yas?= <milestonejxd@gmail.com>
Cc:     Boqun Feng <boqun.feng@gmail.com>, linux-kernel@vger.kernel.org,
        Alan Stern <stern@rowland.harvard.edu>, will.deacon@arm.com,
        torvalds@linux-foundation.org, npiggin@gmail.com, mingo@kernel.org,
        mpe@ellerman.id.au, oleg@redhat.com, benh@kernel.crashing.org,
        Paul McKenney <paulmck@linux.vnet.ibm.com>
Subject: Re: smp_mb__after_spinlock requirement too strong?
Message-ID: <20180312133135.GJ4064@hirez.programming.kicks-ass.net>
References: <CAJDTihwMgUqjK6YL2M_WZY4VBaifVYgNvdZOF_fNrnk_p27Kvw@mail.gmail.com>
 <20180312054412.yqyde34ly3kjoajj@tardis>
 <CAJDTihxxhy7zmhTJ-ky4wvMby_o9y8UOcs9R1dABN7NccekAiQ@mail.gmail.com>
 <20180312085600.aczjkpn73axzs2sb@tardis>
 <20180312085646.GE4064@hirez.programming.kicks-ass.net>
 <CAJDTihyP96H6XTh5M17uMbMHxz8YjFZ89u0YsBGsRpR+BaEU_Q@mail.gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Disposition: inline
Content-Transfer-Encoding: 8bit
In-Reply-To: <CAJDTihyP96H6XTh5M17uMbMHxz8YjFZ89u0YsBGsRpR+BaEU_Q@mail.gmail.com>
User-Agent: Mutt/1.9.3 (2018-01-21)
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Mon, Mar 12, 2018 at 05:13:03PM +0800, 焦晓冬 wrote:

> If the fixed comment could point out where this RCsc is used, it will be great.

The one that comes to mind first is RCU-sched, that relies on a context
switch implying a full smp_mb(). But I think there's more..