linux-kernel - Re: [Use cpuops V1 09/11] Connector: Use this

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Message-ID: <alpine.DEB.2.00.1012070935420.26552@router.home>
Date:	Tue, 7 Dec 2010 09:36:09 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	Tejun Heo <tj@...nel.org>
cc:	akpm@...ux-foundation.org, Scott James Remnant <scott@...ntu.com>,
	Mike Frysinger <vapier@...too.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	linux-kernel@...r.kernel.org,
	Eric Dumazet <eric.dumazet@...il.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Subject: Re: [Use cpuops V1 09/11] Connector: Use this_cpu operations

On Tue, 7 Dec 2010, Tejun Heo wrote:

> > Index: linux-2.6/drivers/connector/cn_proc.c
> > ===================================================================
> > --- linux-2.6.orig/drivers/connector/cn_proc.c	2010-11-30 09:38:33.000000000 -0600
> > +++ linux-2.6/drivers/connector/cn_proc.c	2010-11-30 09:39:38.000000000 -0600
> > @@ -43,9 +43,10 @@ static DEFINE_PER_CPU(__u32, proc_event_
> >
> >  static inline void get_seq(__u32 *ts, int *cpu)
> >  {
> > -	*ts = get_cpu_var(proc_event_counts)++;
> > +	preempt_disable();
> > +	*ts = __this_cpu_inc(proc_event_counts);
>
> Eh?  __this_cpu_inc() evaluates to the incremented value?

Err no. Drop this and I will add it to the series that depends on the inc.

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