netdev - Re: [PATCH] net: code cleanups

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Date:	Wed, 29 Sep 2010 20:13:49 -0700
From:	Joe Perches <joe@...ches.com>
To:	Changli Gao <xiaosuo@...il.com>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	"Pekka Savola (ipv6)" <pekkas@...core.fi>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>, netdev@...r.kernel.org
Subject: Re: [PATCH] net: code cleanups

On Thu, 2010-09-30 at 11:07 +0800, Changli Gao wrote:
> On Thu, Sep 30, 2010 at 10:49 AM, Joe Perches <joe@...ches.com> wrote:
> > On Thu, 2010-09-30 at 10:24 +0800, Changli Gao wrote:
> >> Compare operations are more readable, and compilers generate the same code
> >> for the both.
> > As far as I know, not all supported versions of gcc
> > generate the same code.
> Is the former better for the compilers?

Yes.  I don't know how much it matters though.

> > Also, you could probably now remove the (__force u32) casts.
> Maybe Eric doesn't think so.

Comparisons of equal types don't need (__force u32) casts. 

They needed to be cast to u32 for the bitwise or's to avoid
compiler warnings.


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