netdev - Re: [PATCH] ipv4: avoid undefined behavior in do_ip

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Date:	Sun, 11 Nov 2012 17:50:56 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	xi.wang@...il.com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH] ipv4: avoid undefined behavior in do_ip_setsockopt()

From: Xi Wang <xi.wang@...il.com>
Date: Sun, 11 Nov 2012 17:18:55 -0500

> On 11/11/12 5:02 PM, David Miller wrote:
>> 
>> This code is a fast bit test on purpose.  You're making the
>> code slower.
> 
> No, it's the opposite.  All modern compilers optimize switch cases
> into a fast bit test.

Indeed, I even checked sparc64 with gcc-4.6 and it looks good.

Thanks for the clarification, I'll apply this, thanks.
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