linux-kernel - Re: Not able to use HIGH_RES

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Date:	Thu, 22 Mar 2012 15:55:46 +0530
From:	Ajeet Yadav <ajeet.yadav.77@...il.com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	John Stultz <john.stultz@...aro.org>, linux-kernel@...r.kernel.org,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: Not able to use HIGH_RES_TIMERS on ARM

I understand your point,
Our target (2.6) always had ARCH_USES_GETTIMEOFFSET=y , but still we
were able to use the TRACER in past until the patch "kill
GENERIC_TIMER" published, anyone will ask me remove this patch and use
TRACER, becaue it was working before. :)

If I set  ARCH_USES_GETTIMEOFFSET=n to use this feature, my target
fail to boot. (reason I well understand from our past discussions)

but if do below, everything work find target as well as tracer.

--- linux-3.0.20/kernel/time/Kconfig    2012-02-06 23:01:45.000000000 +0530
+++ linux-3.0.20-dirty/kernel/time/Kconfig      2012-03-19
18:22:32.000000000 +0530
@@ -6,7 +6,7 @@ config TICK_ONESHOT

 config NO_HZ
       bool "Tickless System (Dynamic Ticks)"
-       depends on !ARCH_USES_GETTIMEOFFSET && GENERIC_CLOCKEVENTS
+       depends on GENERIC_CLOCKEVENTS
       select TICK_ONESHOT
       help
         This option enables a tickless system: timer interrupts will
@@ -15,7 +15,7 @@ config NO_HZ

 config HIGH_RES_TIMERS
       bool "High Resolution Timer Support"
-       depends on !ARCH_USES_GETTIMEOFFSET && GENERIC_CLOCKEVENTS
+       depends on GENERIC_CLOCKEVENTS
       select TICK_ONESHOT
       help
         This option enables high resolution timer support. If your

On Thu, Mar 22, 2012 at 3:32 PM, Russell King - ARM Linux
<linux@....linux.org.uk> wrote:
> On Thu, Mar 22, 2012 at 02:46:31PM +0530, Ajeet Yadav wrote:
>> Hi John,
>> On our target  ARCH_USES_GETTIMEOFFSET=y, can you please help me how
>> can I useIRQSOFF_TRACER, PREEMPT_TRACER ?
>
> If you have ARCH_USES_GETTIMEOFFSET=y, the simple answer is: you can't.
>
> Your solution is to update your platform to use clock sources and clock
> events and disable the obsolete ARCH_USES_GETTIMEOFFSET option.
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