linux-kernel - Re: [PATCH 17/19] y2038: use __kernel_timespec in sys

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Date:	Sat, 16 May 2015 00:53:17 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Arnd Bergmann <arnd@...db.de>
cc:	y2038@...ts.linaro.org, baolin.wang@...aro.org,
	albert.aribaud@...ev.fr, john.stultz@...aro.org,
	bamvor.zhangjian@...aro.org, ruchandani.tina@...il.com,
	linux-api@...r.kernel.org, linux-kernel@...r.kernel.org,
	libc-alpha@...rceware.org
Subject: Re: [PATCH 17/19] y2038: use __kernel_timespec in sys_futex

On Wed, 6 May 2015, Arnd Bergmann wrote:

> Conversion for sys_futex is particularly easy, we can use the unmodified
> compat_sys_futex on 32-bit systems to provide compatibility for 32-bit
> time_t, and change sys_futex to pass a __kernel_timespec, which matches
> what future libc implementations will use as their struct timespec.

Unless I'm missing something I doubt that you get away that easy. It
works on 32bit, but not on 64 bit with 32bit app support:

Native 64bit: 	   sys_futex()
32bit timespec32:  compat_sys_futex()
32bit timespec64:  ?????

You cannot map that to sys_futex() because the pointer size differs.
 
Thanks,

	tglx
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