linux-kernel - Re: [RFC PATCH 0/4] Refcount Based Cpu-Hotplug Revisit.

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Message-ID: <20071017041752.GA9940@in.ibm.com>
Date:	Wed, 17 Oct 2007 09:47:52 +0530
From:	Gautham R Shenoy <ego@...ibm.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Dipankar Sarma <dipankar@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Srivatsa Vaddagiri <vatsa@...ibm.com>,
	Rusty Russel <rusty@...tcorp.com.au>,
	Oleg Nesterov <oleg@...sign.ru>, Ingo Molnar <mingo@...e.hu>,
	Paul E McKenney <paulmck@...ibm.com>
Subject: Re: [RFC PATCH 0/4] Refcount Based Cpu-Hotplug Revisit.

On Tue, Oct 16, 2007 at 07:23:38PM -0700, Linus Torvalds wrote:
> 
> 
> On Wed, 17 Oct 2007, Dipankar Sarma wrote:
> > 
> > Unless I am reading the patch wrongly, it seems cpu_hotplug_begin() is called 
> > while holding the cpu_add_remove_lock mutex. So, another CPU cannot come in
> > and do the same until _cpu_down() is over.
> 
> Ahh, in that case I take back that objection, although maybe a comment 
> about the required nesting within the other mutex is in order? Or maybe 
> it's there and I just missed it (blush).

Good point! I'll add the comment before cpu_hotplug_begin().


> 
> 			Linus

Thanks and Regards
gautham.
-- 
Gautham R Shenoy
Linux Technology Center
IBM India.
"Freedom comes with a price tag of responsibility, which is still a bargain,
because Freedom is priceless!"
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