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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/