linux-kernel - Re: [RFC] clocksouce implementation for powerpc

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Message-ID: <46796DEE.5090206@ru.mvista.com>
Date:	Wed, 20 Jun 2007 22:11:58 +0400
From:	Sergei Shtylyov <sshtylyov@...mvista.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Tony Breeds <tony@...eyournoodle.com>,
	Daniel Walker <dwalker@...sta.com>,
	Andrew Morton <akpm@...l.org>,
	john stultz <johnstul@...ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	LinuxPPC-dev <linuxppc-dev@...abs.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [RFC] clocksouce implementation for powerpc

Hello.

Thomas Gleixner wrote:

>>>>+void update_vsyscall(struct timespec *wall_time, struct clocksource *clock)
>>>>+{
>>>>+	timer_recalc_offset(tb_last_jiffy);
>>>>+	timer_check_rtc();
>>>>+}
>>
>>>Hmm .. This doesn't look like it's taking into account that the time has
>>>changed ..
>>
>>    Why? By the time it gets called (form the timer softirq context) 
> 
> 
> It is called from interrupt context at least in mainline. Only the -rt
> patch moves this to the softirq.

    Anyway, by the time it gets called, tb_last_jiffy gets updated.

> 	tglx

WBR, Sergei
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