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Message-ID: <CAOtvUMfgAGBXx-nvFbMHywYGLmKfmbpcQajddoGYA+B22vLOiw@mail.gmail.com> Date: Tue, 1 May 2012 14:26:48 +0300 From: Gilad Ben-Yossef <gilad@...yossef.com> To: Paul Mackerras <paulus@...ba.org> Cc: linux-kernel@...r.kernel.org, Rusty Russell <rusty@...tcorp.com.au> Subject: Re: get/put_online_cpus documentation wrong? On Tue, May 1, 2012 at 3:12 AM, Paul Mackerras <paulus@...ba.org> wrote: > > In Documentation/cpu-hotplug.txt it says: > > " #include <linux/cpu.h> > get_online_cpus() and put_online_cpus(): > > The above calls are used to inhibit cpu hotplug operations. While the > cpu_hotplug.refcount is non zero, the cpu_online_mask will not change. > If you merely need to avoid cpus going away, you could also use > preempt_disable() and preempt_enable() for those sections. > Just remember the critical section cannot call any > function that can sleep or schedule this process away." I *think* the critical section remark here is referring to using preempt_disable/enable(), rather then the use of get/put_online_cpus(). Gilad -- Gilad Ben-Yossef Chief Coffee Drinker gilad@...yossef.com Israel Cell: +972-52-8260388 US Cell: +1-973-8260388 http://benyossef.com "If you take a class in large-scale robotics, can you end up in a situation where the homework eats your dog?" -- Jean-Baptiste Queru -- 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/
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