From: Al Viro <viro@ZenIV.linux.org.uk>
To: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Miklos Szeredi <miklos@szeredi.hu>,
Linus Torvalds <torvalds@linux-foundation.org>,
Linux-Fsdevel <linux-fsdevel@vger.kernel.org>,
Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-unionfs@vger.kernel.org
Subject: Re: [GIT PULL] overlay filesystem v25
Date: Tue, 28 Oct 2014 22:55:13 +0000 [thread overview]
Message-ID: <20141028225512.GD7996@ZenIV.linux.org.uk> (raw)
In-Reply-To: <20141028041127.GM5718@linux.vnet.ibm.com>
On Mon, Oct 27, 2014 at 09:11:27PM -0700, Paul E. McKenney wrote:
> On Tue, Oct 28, 2014 at 01:12:14AM +0000, Al Viro wrote:
> > On Mon, Oct 27, 2014 at 10:36:21AM -0700, Paul E. McKenney wrote:
> > > Code making direct use of smp_read_barrier_depends() is harder to read,
> > > in my experience, but good point on the sparse noise. Maybe a new
> > > lockless_dereference() primitive? Maybe something like the following?
> > > (Untested, probably does not even build.)
> > >
> > > #define lockless_dereference(p) \
> > > ({ \
> > > typeof(*p) *_________p1 = ACCESS_ONCE(p); \
> > > smp_read_barrier_depends(); /* Dependency order vs. p above. */ \
> > > _________p1; \
> > > })
> >
> > Hmm... Where would you prefer to put it? rcupdate.h?
>
> Good a place as any, I guess. Please see patch below. Left to myself,
> I would send this along for the next merge window, but please let me
> know if you would like it sooner.
It's needed sooner, unfortunately. Guys, could you take a look at
vfs.git#for-linus and comment?
next prev parent reply other threads:[~2014-10-28 22:55 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-23 23:25 [GIT PULL] overlay filesystem v25 Miklos Szeredi
2014-10-24 2:20 ` Al Viro
2014-10-24 3:24 ` Al Viro
2014-10-24 7:24 ` Miklos Szeredi
2014-10-25 8:18 ` Al Viro
2014-10-25 9:53 ` Miklos Szeredi
2014-10-25 17:06 ` Al Viro
2014-10-27 8:06 ` Miklos Szeredi
2014-10-27 15:59 ` Paul E. McKenney
2014-10-27 17:28 ` Al Viro
2014-10-27 17:36 ` Paul E. McKenney
2014-10-28 1:12 ` Al Viro
2014-10-28 4:11 ` Paul E. McKenney
2014-10-28 22:55 ` Al Viro [this message]
2014-10-28 23:25 ` Paul E. McKenney
2014-10-24 7:28 ` Geert Uytterhoeven
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