linux-kernel - Re: [PATCH 1/2] MN10300: Move asm-arm/cnt32_to

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Message-id: <alpine.LFD.2.00.0810031512420.3045@xanadu.home>
Date:	Fri, 03 Oct 2008 15:15:24 -0400 (EDT)
From:	Nicolas Pitre <nico@....org>
To:	David Howells <dhowells@...hat.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>, torvalds@...l.org,
	akpm@...ux-foundation.org, linux-am33-list@...hat.com,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] MN10300: Move asm-arm/cnt32_to_63.h to include/linux/

On Thu, 2 Oct 2008, David Howells wrote:

> Nicolas Pitre <nico@....org> wrote:
> 
> > Oh, that's a possibility.  In that case __m_cnt_hi will be reverted to a 
> > previous state just like if cnt32_to_63() has not been called yet since 
> > the new half period.  And a subsequent call will fix that again.
> 
> Surely that's not good enough.  There's a 50% chance that reversion to a
> previous state will result in an extra increment of the __m_cnt_hi on the next
> call.

If so then you're using this interface in an inappropriate way.

The _absolute_ minimum frequency with which this should be fully 
executed is once per half period of the base counter.  I hope that in 
practice it happens far more often than that.


Nicolas
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