linux-kernel - Re: [GIT PULL] overlay filesystem v25

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Message-ID: <20141028011214.GZ7996@ZenIV.linux.org.uk>
Date:	Tue, 28 Oct 2014 01:12:14 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	Miklos Szeredi <miklos@...redi.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux-Fsdevel <linux-fsdevel@...r.kernel.org>,
	Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-unionfs@...r.kernel.org
Subject: Re: [GIT PULL] overlay filesystem v25

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?
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