linux-kernel - Re: [PATCH/RFC 2/2] lib: string: Make all calls to strnicmp into calls to strncasecmp

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Message-ID: <87sikie1n7.fsf@rasmusvillemoes.dk>
Date:	Wed, 27 Aug 2014 11:13:16 +0200
From:	Rasmus Villemoes <linux@...musvillemoes.dk>
To:	Dan Carpenter <dan.carpenter@...cle.com>
Cc:	Grant Likely <grant.likely@...aro.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <ak@...ux.intel.com>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH/RFC 2/2] lib: string: Make all calls to strnicmp into calls to strncasecmp

On Wed, Aug 27 2014, Dan Carpenter <dan.carpenter@...cle.com> wrote:

> On Wed, Aug 27, 2014 at 09:36:02AM +0200, Rasmus Villemoes wrote:
>> The previous patch made strnicmp into a wrapper for strncasecmp. This
>> patch makes all in-tree users of strnicmp call strncasecmp directly,
>> while still making sure that the strnicmp symbol can be used by
>> out-of-tree modules. It should be considered a temporary hack until
>> all in-tree callers have been converted.
>> 
>> Signed-off-by: Rasmus Villemoes <linux@...musvillemoes.dk>
>
> Won't GCC just do the right thing without this second patch?
>

Not without LTO, I think. gcc can't really know how strnicmp is
implemented, so it has to emit a call to it.

Anyway, I was also planning on sending tree-wide patches doing
s/strnicmp/strncasecmp/, and then removing the hack from string.h, but I
first wanted to get feedback on the first patch and maybe some guidance
on how to properly deal with the module issue (e.g., does the kernel
need to export a strnicmp symbol forever?).

Rasmus
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