linux-kernel - Re: [PATCH 3/4] Add physical count arch timer support for clocksource in ARMv7.

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Message-ID: <CAK3cCBz+zvnfNJjjQwZdgreG9uJS9ZQu9GwrQs6CL8A1-_foOg@mail.gmail.com>
Date:	Fri, 13 Sep 2013 00:09:40 +0800
From:	cinifr <cinifr@...il.com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Mark Rutland <mark.rutland@....com>,
	"coosty@....com" <coosty@....com>,
	"maxime.ripard@...e-electrons.com" <maxime.ripard@...e-electrons.com>,
	"daniel.lezcano@...aro.org" <daniel.lezcano@...aro.org>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"pawel.moll@....co" <pawel.moll@....co>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	"linux-sunxi@...glegroups.com" <linux-sunxi@...glegroups.com>,
	Marc Zyngier <marc.zyngier@....com>
Subject: Re: [PATCH 3/4] Add physical count arch timer support for clocksource
 in ARMv7.

Thanks, but I am tring a  solution in running time.

On 12 September 2013 22:33, Russell King - ARM Linux
<linux@....linux.org.uk> wrote:
> On Thu, Sep 12, 2013 at 12:24:52PM +0100, Mark Rutland wrote:
>> On Thu, Sep 12, 2013 at 07:51:26AM +0100, Fan Rong wrote:
>> > diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
>> > index 41c6946..a4981d2 100644
>> > --- a/drivers/clocksource/Kconfig
>> > +++ b/drivers/clocksource/Kconfig
>> > @@ -109,3 +109,11 @@ config VF_PIT_TIMER
>> >     bool
>> >     help
>> >       Support for Period Interrupt Timer on Freescale Vybrid Family SoCs.
>> > +menu "Clock Source"
>> > +
>> > +config ARM_ARCH_TIMER_USE_PHYCNT
>> > +   bool "Use Physical Count Timer"
>> > +   depends on ARM_ARCH_TIMER
>> > +   help
>> > +          If bootloader dont set Virtual Offset register,Physical Count Timer is needed to replace Virtual Count Timer.
>> > +endmenu
>>
>> This cannot be a compile-time option as above in a multiplatform build.
>> Other paltforms (e.g. KVM guests) *must* use the virtual counters to get
>> any semblance of a consistent view of time.
>
> Also, for future reference:
>
> 1. Use a single blank lines to separate thing like 'menu' and 'endmenu'.
> 2. Wrap your the help sensibly, don't put it all on one line.
> 3. It's conventional to use tabs up to below "help" and then two spaces
>    to indent the help text.
> 4. "," always has one space after it.
>
> Thanks.
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