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

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Date:	Wed, 20 Jun 2007 19:31:21 +0200
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Sergei Shtylyov <sshtylyov@...mvista.com>
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

On Wed, 2007-06-20 at 21:20 +0400, Sergei Shtylyov 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.

	tglx


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