linux-kernel - Re: [2.6 patch] asm-generic/int-ll64.h: always provide _

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Date:	Mon, 19 May 2008 15:01:03 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Adrian Bunk <bunk@...nel.org>
CC:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [2.6 patch] asm-generic/int-ll64.h: always provide __{s,u}64

Adrian Bunk wrote:
> Several compilers offer "long long" without claiming to support C99.
> 
> Considering how frequent __s64/__u64 are used our userspace headers are 
> anyway unusable without __s64/__u64 available.
> 
> Always offer __s64/__u64 to non-gcc non-C99 compilers - if they provide 
> "long long" that makes the headers compiling and if they don't they are 
> anyway screwed.
> 
> Signed-off-by: Adrian Bunk <bunk@...nel.org>

This makes sense to me (I did, however, not want to make that change 
part of the same changeset - one change at a time.)

The main reason for not just blindly using "long long" has to do with 
the use of gcc -ansi -pedantic in userspace, which is already taken care 
of by the use of __extension__ in the __GNUC__ clause.

Acked-by: H. Peter Anvin <hpa@...or.com>

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