linux-kernel - Re: [PATCH] x86: make stat/statfs 64-bit for x86

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Message-ID: <518B2387.9030408@zytor.com>
Date:	Wed, 08 May 2013 21:18:15 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Mike Frysinger <vapier@...too.org>
CC:	x86@...nel.org, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: make stat/statfs 64-bit for x86_64 kernels

On 05/08/2013 09:08 PM, Mike Frysinger wrote:
> On Thursday 09 May 2013 00:04:03 H. Peter Anvin wrote:
>> On 05/08/2013 09:00 PM, Mike Frysinger wrote:
>>> When including these headers in the x32 ABI, the structs get
>>> declared with 32bit sizes which is incorrect.  Use long long
>>> and such to make it work both with x32 and x86_64.
>> 
>> I'm not sure if it is okay to change the types, even within the
>> same size.  Perhaps use __u64/__s64?
> 
> sorry, i don't follow.  changing types isn't ok (unsigned long to
> unsigned long long), but changing to __u64 is ok (unsigned long to
> __u64 which is typedefed to unsigned long long) ?
> 
> i don't have a problem using __u64/__s64, i just don't understand
> your logic.
> 

In userspace, __u64 is often defined as "unsigned long" on 64 bits.

	-hpa

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