linux-kernel - Re: Not able to use HIGH_RES

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Message-ID: <20120319130445.GN15988@n2100.arm.linux.org.uk>
Date:	Mon, 19 Mar 2012 13:04:45 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Ajeet Yadav <ajeet.yadav.77@...il.com>
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

On Mon, Mar 19, 2012 at 06:31:44PM +0530, Ajeet Yadav wrote:
> Hi John, refering to you patch:
> 
> ARM: remove 'select GENERIC_TIME'
> GENERIC_TIME is now enabled by default, so 'select GENERIC_TIME' is
> redundant.  Remove them.
> 
> The following config's are not selectable:
> config NO_HZ, config HIGH_RES_TIMERS, config IRQSOFF_TRACER, config
> PREEMPT_TRACER
> 
> As far as I know, ARM now uses GENERIC_TIME via the arch_getoffset()
> infrastructure, i.e ARCH_USES_GETTIMEOFFSET=y

No.  It is possible to select these options, but only if your platform
uses the clockevent and clocksource infrastructure.  If you're using that,
then you must _not_ select ARCH_USES_GETTIMEOFFSET.

ARCH_USES_GETTIMEOFFSET is for compatibility with old unconverted
platforms, which are _not_ possible to use the above features.
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