linux-kernel - Re: [PATCH] Use __kernel_long_t/__kernel_ulong

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Date:	Thu, 26 Dec 2013 10:08:07 -0800
From:	"H.J. Lu" <hjl.tools@...il.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Use __kernel_long_t/__kernel_ulong_t in <linux/resource.h>

On Thu, Dec 26, 2013 at 9:58 AM, H. Peter Anvin <hpa@...or.com> wrote:
> On 12/26/2013 05:52 AM, H.J. Lu wrote:
>>
>>>  c) why you suddenly need these changes now and not when the x32 ABI
>>>     support was submitted and hopefully heavily tested
>>
>> Kernel headers had been wrong for -m32/-mx32 on x86-64
>> for a long long time.  Linux/x86-64 normally use header
>> files from glibc, which avoids broken kernel header files.
>> Kernel uabi header files fix -m32, but not -mx32, which I am
>> working on now.
>>
>
> In other words, this work is really part of making *libc make use the
> kernel uabi headers, which is a valuable work.  The fact that the kernel
> headers never got fully ported to x32 is a big reason why x32 is still
> labeled experimental.
>
> MIPS N32 and ARM64 ILP32 are x32-like ABIs which of course need to not
> be broken.  However, currently __kernel_[u]long_t is [unsigned] long for
> all ABIs other than x32, so changing [unsigned] long to
> __kernel_[u]long_t will be a null change for anything but x32.  They
> perhaps *SHOULD* be different for N32 or ARM64 ILP32, but that is for
> those arch maintainers to set.
>
> However, I believe H.J.'s patches from this morning conditionalizing
> this on __BITS_PER_LONG are just plain wrong.

FWIW, I prefer my first alternative.  I only added the second one
since I can't test for other ABIs.

I am enclosing my kernel header file checker.  It compares
kernel header files against glibc header files for -m64, -m32
and -mx32.

-- 
H.J.

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