linux-kernel - Re: [PATCH 3/4]percpu_counter: fix code for 32bit systems

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Message-ID: <1302666820.2811.115.camel@edumazet-laptop>
Date:	Wed, 13 Apr 2011 05:53:40 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Shaohua Li <shaohua.li@...el.com>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"cl@...ux.com" <cl@...ux.com>, "tj@...nel.org" <tj@...nel.org>
Subject: Re: [PATCH 3/4]percpu_counter: fix code for 32bit systems

Le mercredi 13 avril 2011 à 11:03 +0800, Shaohua Li a écrit :
> I can do this, but please give a reason. If network code is the only
> place requiring disable irq, why not network code do it?
> 

Lot of percpu_counter users dont use full s64 range, but "unsigned long"
or "unsigned int". Adding a lock on 32bit arches to get the s64, then
truncate it is not needed.

This discussion reminds me an old one ;)

http://kerneltrap.org/mailarchive/linux-ext4/2008/12/12/4401894



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