linux-kernel - Re: new architectures, time_t __kernel_long

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Message-ID: <CAMe9rOqvEFp=J-93WVgmF9K-hspq4z444a8PCJWC3tiSRkteOg@mail.gmail.com>
Date:	Thu, 15 Nov 2012 06:42:16 -0800
From:	"H.J. Lu" <hjl.tools@...il.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	"H. Peter Anvin" <hpa@...or.com>, linux-arch@...r.kernel.org,
	Vineet.Gupta1@...opsys.com, linux-kernel@...r.kernel.org,
	James Hogan <james.hogan@...tec.com>
Subject: Re: new architectures, time_t __kernel_long_t

On Thu, Nov 15, 2012 at 6:36 AM, Arnd Bergmann <arnd@...db.de> wrote:
> On Thursday 15 November 2012, H.J. Lu wrote:
>> On Thu, Nov 15, 2012 at 1:14 AM, Arnd Bergmann <arnd@...db.de> wrote:
>> > On Wednesday 14 November 2012, H. Peter Anvin wrote:
>> >> On 11/14/2012 04:18 AM, Arnd Bergmann wrote:
>> >> > Since we are in the review phase for two new architectures that we
>> >> > should be merging into the mainline kernel, I think we need to
>> >> > come up with a solution for making them use a proper 64-bit time_t.
>> >> >
>> >> > Right now, the only 32-bit user space interface we have to use 64-bit
>> >> > time_t is the x32 side of x86-64, and that works by overriding all
>> >> > "long" sized types to be 64 bit at the ABI level, which we don't
>> >> > want for pure 32 bit architectures.
>> >>
>> >> Sort of.  Either way, the kernel headers aren't really x32-clean yet, so
>> >> we have an opportunity to do things more cleanly as we are implementing
>> >> this.
>> >
>> > Ah, I didn't know that. How does one build an x32 libc then?
>>
>> Glibc has been providing its own types for years.
>> Kernel provided types used to be wrong for ia32
>> on x86-64.
>
> What about ioctls and other calls then that actually do rely on the
> kernel headers and use the __kernel_*_t types?
>

Glibc defines __syscall_slong_t and __syscall_ulong_t.

-- 
H.J.
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