linux-kernel - Re: [RFC PATCH v6] Documentation/arch: Add Documentation/arch-features.txt

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Date:	Thu, 14 May 2015 13:55:17 +1000
From:	Paul Mackerras <paulus@...ba.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Borislav Petkov <bp@...en8.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jonathan Corbet <corbet@....net>,
	Peter Zijlstra <peterz@...radead.org>,
	Josh Triplett <josh@...htriplett.org>,
	Andy Lutomirski <luto@...capital.net>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-api@...r.kernel.org, linux-kernel@...r.kernel.org,
	x86@...nel.org, linux-arch@...r.kernel.org
Subject: Re: [RFC PATCH v6] Documentation/arch: Add
 Documentation/arch-features.txt

On Wed, May 13, 2015 at 03:48:42PM +0200, Ingo Molnar wrote:
> 
> Updated patch attached - I've added a few more features to the last 
> table, and restructured the explanations, now every feature 
> description also lists the Kconfig variable that it's tracking, e.g.:
> 
>       irq time acct: HAVE_IRQ_TIME_ACCOUNTING

Regarding that one specifically, as far as I can see,
HAVE_IRQ_TIME_ACCOUNTING is only relevant for tick-based time
accounting.  If you have CONFIG_VIRT_CPU_ACCOUNTING you get accurate
irq time accounting with or without HAVE_IRQ_TIME_ACCOUNTING.  So how
about making this one:

	irq time acct: HAVE_IRQ_TIME_ACCOUNTING || VIRT_CPU_ACCOUNTING

That would make the "irq time acct" entry for powerpc be "ok".

Paul.
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