Subject: Re: [PATCH] Hook compat_sys_nanosleep up to high res timer code

From: Arnd Bergmann <[email-masked]>
Date: Mon, 15 Oct 2007 00:28:05 +0200

On Sunday 14 October 2007, Anton Blanchard wrote:
> Now we have high res timers on ppc64 I thought Id test them. It turns
> out compat_sys_nanosleep hasnt been converted to the hrtimer code and so
> is limited to HZ resolution.
> 
> The following patch makes compat_sys_nanosleep call hrtimer_nanosleep
> and uses compat_alloc_user_space to avoid setting KERNEL_DS.
> 
> Signed-off-by: Anton Blanchard <[email-masked]>

The code looks correct, but I think it would be nicer to change 
hrtimer_nanosleep to take a kernel pointer and have all three
callers (common_nsleep, sys_nanosleep and compat_sys_nanosleep)
do the copy_to_user/put_compat_timespec in the caller.

This would also make it possible to get rid of set_fs() in
compat_sys_clock_nanosleep().

	Arnd <><