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From: Andrea Parri <andrea.parri@amarulasolutions.com>
To: "Yan, Zheng" <ukernel@gmail.com>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	"Yan, Zheng" <zyan@redhat.com>, Sage Weil <sage@redhat.com>,
	Ilya Dryomov <idryomov@gmail.com>,
	ceph-devel <ceph-devel@vger.kernel.org>,
	"Paul E. McKenney" <paulmck@linux.ibm.com>,
	Peter Zijlstra <peterz@infradead.org>
Subject: Re: [PATCH 4/5] ceph: fix improper use of smp_mb__before_atomic()
Date: Thu, 9 May 2019 22:55:43 +0200	[thread overview]
Message-ID: <20190509205452.GA4359@andrea> (raw)
In-Reply-To: <CAAM7YA=YOM79GJK8b7OOQbzT_-sYRD2UFHYithY7Li1yQt5Hog@mail.gmail.com>

On Tue, Apr 30, 2019 at 05:08:43PM +0800, Yan, Zheng wrote:
> On Tue, Apr 30, 2019 at 4:26 PM Peter Zijlstra <peterz@infradead.org> wrote:
> >
> > On Mon, Apr 29, 2019 at 10:15:00PM +0200, Andrea Parri wrote:
> > > This barrier only applies to the read-modify-write operations; in
> > > particular, it does not apply to the atomic64_set() primitive.
> > >
> > > Replace the barrier with an smp_mb().
> > >
> >
> > > @@ -541,7 +541,7 @@ static inline void __ceph_dir_set_complete(struct ceph_inode_info *ci,
> > >                                          long long release_count,
> > >                                          long long ordered_count)
> > >  {
> > > -     smp_mb__before_atomic();
> >
> > same
> >         /*
> >          * XXX: the comment that explain this barrier goes here.
> >          */
> >
> 
> makes sure operations that setup readdir cache (update page cache and
> i_size) are strongly ordered with following atomic64_set.

Thanks for the suggestion, Yan.

To be clear: would you like me to integrate your comment and resend?
any other suggestions?

Thanx,
  Andrea


> 
> > > +     smp_mb();
> >
> > >       atomic64_set(&ci->i_complete_seq[0], release_count);
> > >       atomic64_set(&ci->i_complete_seq[1], ordered_count);
> > >  }
> > > --
> > > 2.7.4
> > >

  reply	other threads:[~2019-05-09 20:55 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-29 20:14 [PATCH 0/5] Fix improper uses of smp_mb__{before,after}_atomic() Andrea Parri
2019-04-29 20:14 ` [PATCH 1/5] drm/msm: " Andrea Parri
2019-05-09 20:19   ` Andrea Parri
2019-04-29 20:14 ` [PATCH 2/5] bio: fix improper use of smp_mb__before_atomic() Andrea Parri
2019-04-30  8:21   ` Peter Zijlstra
2019-05-09 20:23   ` Andrea Parri
2019-05-10  3:40   ` Ming Lei
2019-04-29 20:14 ` [PATCH 3/5] sbitmap: " Andrea Parri
2019-05-09 20:26   ` Andrea Parri
2019-05-10  3:41   ` Ming Lei
2019-05-10  6:27     ` Andrea Parri
2019-04-29 20:15 ` [PATCH 4/5] ceph: " Andrea Parri
2019-04-30  8:23   ` Peter Zijlstra
2019-04-30  9:08     ` Yan, Zheng
2019-05-09 20:55       ` Andrea Parri [this message]
2019-05-13 13:04         ` Yan, Zheng
2019-05-13 22:47           ` Andrea Parri
2019-04-29 20:15 ` [PATCH 5/5] IB/hfi1: Fix improper uses " Andrea Parri
2019-04-29 21:24   ` Ruhl, Michael J
2019-04-29 23:16     ` Andrea Parri
2019-05-09 21:12       ` Andrea Parri
2019-05-14 12:32         ` Dennis Dalessandro
2019-05-14 14:48           ` Andrea Parri
2019-04-30  8:28   ` Peter Zijlstra
2019-04-30  8:34 ` [PATCH 0/5] Fix improper uses of smp_mb__{before,after}_atomic() Peter Zijlstra
2019-04-30 16:44   ` Andrea Parri

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