linux-kernel - Re: [PATCHv4 2/2] memory barrier: adding smp_mb__after

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Message-ID: <20090703075140.GD2902@jolsa.lab.eng.brq.redhat.com>
Date:	Fri, 3 Jul 2009 09:51:40 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Jarek Poplawski <jarkao2@...il.com>
Cc:	Davide Libenzi <davidel@...ilserver.org>,
	Eric Dumazet <eric.dumazet@...il.com>, netdev@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	fbl@...hat.com, nhorman@...hat.com, davem@...hat.com,
	htejun@...il.com, oleg@...hat.com
Subject: Re: [PATCHv4 2/2] memory barrier: adding smp_mb__after_lock

On Fri, Jul 03, 2009 at 07:47:31AM +0000, Jarek Poplawski wrote:
> On Fri, Jul 03, 2009 at 09:41:26AM +0200, Jiri Olsa wrote:
> > On Thu, Jul 02, 2009 at 07:39:04AM -0700, Davide Libenzi wrote:
> > > On Thu, 2 Jul 2009, Eric Dumazet wrote:
> > > 
> > > > Jiri Olsa a écrit :
> > > > > Adding smp_mb__after_lock define to be used as a smp_mb call after
> > > > > a lock.  
> > > > > 
> > > > > Making it nop for x86, since {read|write|spin}_lock() on x86 are 
> > > > > full memory barriers.
> > > > > 
> > > > > wbr,
> > > > > jirka
> > > > > 
> > > > > 
> > > > > Signed-off-by: Jiri Olsa <jolsa@...hat.com>
> > > > 
> > > > 
> > > > Maybe we should remind that sk_has_helper() is always called
> > > > right after a call to read_lock() as in :
> > > > 
> > > > 	read_lock(&sk->sk_callback_lock);
> > > > 	if (sk_has_sleeper(sk))
> > > > 		wake_up_interruptible_all(sk->sk_sleep);
> > > 
> > > Agreed, that'd be to have it in the source code comment.
> > > 
> > > 
> > > - Davide
> > > 
> > 
> > ok, I'll add it to the 1/2 part in v5
> > 
> 
> Btw., there is a tiny typo:
> 
> - receive callbacks. Adding fuctions sock_poll_wait and sock_has_sleeper
> + receive callbacks. Adding fuctions sock_poll_wait and sk_has_sleeper
> 
> Jarek P.

thanks, jirka
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