linux-kernel - Re: [PATCH 01/24] types: create <asm-generic/int-*.h>

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Message-ID: <48123325.30003@zytor.com>
Date:	Fri, 25 Apr 2008 12:38:13 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Matthew Wilcox <matthew@....cx>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jan Engelhardt <jengelh@...putergmbh.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Arch Mailing List <linux-arch@...r.kernel.org>
Subject: Re: [PATCH 01/24] types: create <asm-generic/int-*.h>

Matthew Wilcox wrote:
> On Fri, Apr 25, 2008 at 12:10:40PM -0700, H. Peter Anvin wrote:
>> Well, compatibility with userspace is probably one aspect of that. 
>> x86-64 is the odd man out there, it defines __s64 as "long long" even 
>> for userspace, even though int64_t from <stdint.h> is "long".  This, 
>> IMO, is the Wrong Thing, but it's a separate set of changes.
>>
>> The right thing to do is probably to always use "long long" in the 
>> kernel, while defining __s64 et al as "long" on 64-bit platforms when 
>> not under __KERNEL__.
>>
>> Again, this is a separate set of changes from this patchset, which is 
>> just a code transformation.
> 
> Understood, and agreed.  It just seemed like an opportune time to
> mention the problem of printing a u64.
> 

I have to admit to liking the Windows extension %I64u for this kind of 
stuff.  Unfortunately gcc/glibc decided to use I for internationalized 
digits instead :(

	-hpa
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