linux-kernel - Re: [PATCH 1/4] cputime: Generalize CONFIG_VIRT_CPU

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Message-ID: <20120816095336.4eeb3ce1@de.ibm.com>
Date:	Thu, 16 Aug 2012 09:53:36 +0200
From:	Martin Schwidefsky <schwidefsky@...ibm.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Tony Luck <tony.luck@...el.com>,
	Fenghua Yu <fenghua.yu@...el.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH 1/4] cputime: Generalize CONFIG_VIRT_CPU_ACCOUNTING

On Wed, 15 Aug 2012 21:09:04 +0200
Frederic Weisbecker <fweisbec@...il.com> wrote:

> On Wed, Aug 15, 2012 at 05:03:47PM +0200, Martin Schwidefsky wrote:
> > On Tue, 14 Aug 2012 16:16:47 +0200
> > Frederic Weisbecker <fweisbec@...il.com> wrote:
> > 
> > > S390, ia64 and powerpc all define their own version
> > > of CONFIG_VIRT_CPU_ACCOUNTING. Generalize the config
> > > and its description to a single place to avoid
> > > duplication.
> > 
> > For S390 CONFIG_VIRT_CPU_ACCOUNTING is not configurable, it is always
> > enabled. With this patch we'd get a config option in the menu, no?
> 
> Indeed it now appears in the menu but in the case of s390, it's impossible
> to turn it off due to:
> 
> 	config S390
> 		select VIRT_CPU_ACCOUNTING
> 
> This creates a strict dependency that the user can't override. The option
> is untoggable.

Hmm, ok. But then the description should be reworded not to be specific to
the power architecture (the part of the message about "This also enables
accounting of stolen time on logically-partitioned systems running on IBM
POWER5-based machines.").

-- 
blue skies,
   Martin.

"Reality continues to ruin my life." - Calvin.

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