netdev - Re: Re: [PATCHv4 10/11] drop_monitor: Use *_dec_not_zero instead of *_add

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Date:	Wed, 27 Jul 2011 13:52:50 +0200
From:	Sven Eckelmann <sven@...fation.org>
To:	Neil Horman <nhorman@...driver.com>
Cc:	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: Re: [PATCHv4 10/11] drop_monitor: Use *_dec_not_zero instead of *_add_unless

On Wednesday 27 July 2011 06:59:07 Neil Horman wrote:
> On Wed, Jul 27, 2011 at 11:47:49AM +0200, Sven Eckelmann wrote:
> > atomic_dec_not_zero is defined for each architecture through
> > <linux/atomic.h> to provide the functionality of
> > atomic_add_unless(x, -1, 0).
> > 
> > Signed-off-by: Sven Eckelmann <sven@...fation.org>
> > Cc: Neil Horman <nhorman@...driver.com>
> > Cc: netdev@...r.kernel.org
> > ---
> > 
> >  net/core/drop_monitor.c |    2 +-
> >  1 files changed, 1 insertions(+), 1 deletions(-)
> > 
> > diff --git a/net/core/drop_monitor.c b/net/core/drop_monitor.c
> > index 7f36b38..ef4a05d 100644
> > --- a/net/core/drop_monitor.c
> > +++ b/net/core/drop_monitor.c
> > @@ -137,7 +137,7 @@ static void trace_drop_common(struct sk_buff *skb,
> > void *location)
> > 
> >  	struct per_cpu_dm_data *data = &__get_cpu_var(dm_cpu_data);
> > 
> > -	if (!atomic_add_unless(&data->dm_hit_count, -1, 0)) {
> > +	if (!atomic_dec_not_zero(&data->dm_hit_count)) {
> > 
> >  		/*
> >  		
> >  		 * we're already at zero, discard this hit
> >  		 */
> 
> Wheres the patch that creates the per arch definition of this function?  I
> see the other posts in this series went to lkml, but the archives don't
> have the first in the series anywhere, which ostensibly adds the
> definition. Neil

Most architectures don't use a per architecture definition anymore, but a 
cross-architecture the definition in include/linux/atomic.h.

The 01/11 can be found in different archives under the message id 
1311760070-21532-1-git-send-email-sven@...fation.org ... for example gmane: 
http://article.gmane.org/gmane.linux.ports.arm.kernel/126704

Kind regards,
	Sven
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