linux-kernel - Re: [PATCH 4/6] x86/cpufreq: use cpumask

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Message-ID: <4A2E19A7.1000302@kernel.org>
Date:	Tue, 09 Jun 2009 01:13:27 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Rusty Russell <rusty@...tcorp.com.au>
CC:	Avi Kivity <avi@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Dave Jones <davej@...hat.com>, cpufreq@...r.kernel.org
Subject: Re: [PATCH 4/6] x86/cpufreq: use cpumask_copy instead of =

Rusty Russell wrote:
> On Sun, 7 Jun 2009 07:23:52 am Yinghai Lu wrote:
>   
>> so later could use nr_cpumask_bits in cpumask_size when MAXSMP is used
>>     
>
> I have a (more ambitious) patch for this in my queue, which weans it off this
> entirely:
>
> Subject: cpumask: avoid playing with cpus_allowed in powernow-k8.c
> From: Rusty Russell <rusty@...tcorp.com.au>
>
> It's generally a very bad idea to mug some process's cpumask: it could
> legitimately and reasonably be changed by root, which could break us
> (if done before our code) or them (if we restore the wrong value).
>
> I use work_on_cpu, which is slightly less efficient than the old code,
> but the code is complex enough that using smp_call_function_single()
> is not trivial.
>   

will be in .31?

YH
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