linux-kernel - Re: [PATCH] init/main.c: Use ktime accessor function in initcall

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Message-ID: <4925A0BC.7050207@am.sony.com>
Date:	Thu, 20 Nov 2008 09:39:08 -0800
From:	Tim Bird <tim.bird@...sony.com>
To:	Will Newton <will.newton@...il.com>
CC:	linux-kernel <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] init/main.c: Use ktime accessor function in initcall_debug
 code.

Will Newton wrote:
> The initcall_debug code access the tv64 member of ktime. This won't work
> correctly for large deltas on platforms that don't use the scalar ktime
> implementation.

In principle I see no problem with this.  But as a matter of
practice it may be overkill.

How big does the delta have to be for this to be a problem?
And how much overhead does ktime_to_ns() add?
 -- Tim

=============================
Tim Bird
Architecture Group Chair, CE Linux Forum
Senior Staff Engineer, Sony Corporation of America
=============================

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