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

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Message-ID: <20080519223232.GB17716@cs181133002.pp.htv.fi>
Date:	Tue, 20 May 2008 01:32:32 +0300
From:	Adrian Bunk <bunk@...sta.de>
To:	Harvey Harrison <harvey.harrison@...il.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>, Adrian Bunk <bunk@...nel.org>,
	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

On Mon, May 19, 2008 at 03:27:28PM -0700, Harvey Harrison wrote:
> On Mon, 2008-05-19 at 15:01 -0700, H. Peter Anvin wrote:
> > 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.
> > 
> 
> If it is going to be unconditionally offered, we could get rid of
> __BYTEORDER_HAS_U64__ as a next step.  Unless there is something I've
> missed.

Why do we need the byteorder headers in userspace at all?

> Harvey

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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