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

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Message-ID: <20150513165358.GA22979@x>
Date:	Wed, 13 May 2015 09:53:59 -0700
From:	Josh Triplett <josh@...htriplett.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>,
	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 09:27:57AM -0700, Josh Triplett wrote:
> How likely is this to get out of date?  Are people going to remember to
> patch this when they add a feature to their architecture?  If
> they found out they had work to do by reading this file, which is the
> goal, then they'll likely remember to edit the file; however, if they
> find the feature and fix it without knowing about the file, will someone
> notice?
> 
> Is there any way we can *generate* this file from Kconfig?  Can we
> extract the necessary "this is possible to enable" or "this arch selects
> this symbol" information from Kconfig, and together with the list of
> symbols for features needing architecture support, generate the table?

Just tried this.  Looks like it's pretty trivial for most of these
features: just make ARCH=thearch allyesconfig, then look for the config
symbol in the result.

For instance, after doing "make ARCH=alpha allyesconfig":

~/src/linux$ grep -x 'CONFIG_ARCH_HAS_ELF_RANDOMIZE=y' .config || echo TODO
TODO

~/src/linux$ grep -x 'CONFIG_GENERIC_CLOCKEVENTS=y' .config || echo TODO
CONFIG_GENERIC_CLOCKEVENTS=y

This seems easy to turn into a shell script or Python script, given a list of
feature descriptions and corresponding config symbols, as well as a list of
architectures.

- Josh Triplett
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