linux-kernel - Re: [RFC 07/13] sched: Reduce stack size requirements in kernel/sched.c

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Date:	Sun, 7 Sep 2008 04:00:09 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Mike Travis <travis@....com>, Ingo Molnar <mingo@...e.hu>,
	davej@...emonkey.org.uk, David Miller <davem@...emloft.net>,
	Eric Dumazet <dada1@...mosbay.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Jack Steiner <steiner@....com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Jes Sorensen <jes@....com>, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC 07/13] sched: Reduce stack size requirements in
 kernel/sched.c

On Sun, 07 Sep 2008 12:24:47 +0200 Peter Zijlstra <peterz@...radead.org> wrote:

> get_online_cpus() can sleep, but you just disabled preemption with those
> get_cpumask_var() horribles!

make cpu_hotplug.refcount an atomic_t.

> Couldn't be arsed to look through the rest, but I really hate this
> cpumask_ptr() stuff that relies on disabling preemption.

that's harder to fix ;)
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