linux-kernel - Re: [PATCH] time: Add locking to xtime access in get

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Message-Id: <1304527860.21305.5.camel@w-amax.beaverton.ibm.com>
Date:	Wed, 04 May 2011 09:51:00 -0700
From:	Max Asbock <masbock@...ux.vnet.ibm.com>
To:	John Stultz <john.stultz@...aro.org>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	John Stultz <johnstul@...ibm.com>,
	Paul Mackerras <paulus@...ba.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Anton Blanchard <anton@...ba.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] time: Add locking to xtime access in get_seconds()

On Tue, 2011-05-03 at 20:11 -0700, John Stultz wrote:
> From: John Stultz <johnstul@...ibm.com>
> 
> So get_seconds() has always been lock free, with the assumption
> that accessing a long will be atomic.
> 

get_seconds() is used in the x86 machine check handler and there is a
comment saying:
/* We hope get_seconds stays lockless */

This needs to be carefully looked at if locking is introduced to
get_seconds().

- Max

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