linux-kernel - [ppc] Disparity between sys_clock

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Message-Id: <200801271932.59823.sripathik@in.ibm.com>
Date:	Sun, 27 Jan 2008 19:32:59 +0530
From:	Sripathi Kodi <sripathik@...ibm.com>
To:	paulus@...ba.org
Cc:	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org,
	john stultz <johnstul@...ibm.com>
Subject: [ppc] Disparity between sys_clock_getres and vdso implementation

Hi Paul,

On PPC, I see a disparity between clock_getres implementations in the
vdso and syscall. I am using a IBM Openpower hardware and 2.6.24 kernel
with CONFIG_HIGH_RES_TIMERS=y. 

clock_getres call for CLOCK_REALTIME returns 1 millisecond. However,
when I edit arch/powerpc/kernel/vdso*/gettimeofday.S to force it to use 
sys_clock_getres, I get 1 nanosecond resolution. The code in vdso seems
to be returning some pre-defined (incorrect) variables.

Could you please let me know the reason for this? Is it something that
should be fixed in vdso?

Thanks,
Sripathi.
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