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

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Message-ID: <20120815190901.GD19716@somewhere>
Date:	Wed, 15 Aug 2012 21:09:04 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Martin Schwidefsky <schwidefsky@...ibm.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, 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.
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