linux-kernel - Re: [PULL] cpumask: finally make them variable size w/ CPUMASK

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Message-ID: <20120510074215.GA28395@gmail.com>
Date:	Thu, 10 May 2012 09:42:15 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
	LKML <linux-kernel@...r.kernel.org>, anton@...ba.org,
	Arnd Bergmann <arnd@...db.de>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Mike Travis <travis@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [PULL] cpumask: finally make them variable size w/
 CPUMASK_OFFSTACK.

* Rusty Russell <rusty@...tcorp.com.au> wrote:

> Mainly because I didn't want to disturb the archs which don't 
> care at all about large cpumasks.  After all, putting a struct 
> cpumask on the stack is pretty convenient.

Yes.

> But we could add a new arch config which removes it, and set 
> it from x86.

Could we just use a single cpumask type, cpumask_t or so, which 
would be the *only* generic method to use cpumasks?

(Current cpumask_t would move to cpumask_full_t.)

This would be the 'final' destiation for the cpumask code: the 
natural type to use in new code is cpumask_t, while in special 
cases we could use cpumask_full_t - but the name signals that 
it's a potentially large structure.

On architectures that don't worry about large cpumasks (yet ...) 
cpumask_t and cpumask_full_t maps to the same thing, so there's 
no difference.

This would make things more natural IMO.

There would be no 'struct cpumask'. (and 'cpumask_var_t' would 
disappear too due to the rename.)

Thoughts?

	Ingo
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