From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ingo Molnar <mingo@elte.hu>
Date: Tue, 27 Oct 2009 13:04:07 +0000
Subject: Re: [PATCH 1/2] percpu: allow pcpu_alloc() to be called with IRQs
Message-Id: <20091027130407.GB32628@elte.hu>
List-Id: <linux-ia64.vger.kernel.org>
References: <alpine.LSU.2.00.0910271328340.19847@wotan.suse.de> <4AE6EDBF.7040905@kernel.org>
In-Reply-To: <4AE6EDBF.7040905@kernel.org>
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To: Tejun Heo <tj@kernel.org>
Cc: Jiri Kosina <jkosina@suse.cz>, Peter Zijlstra <peterz@infradead.org>, Jeff Mahoney <jeffm@suse.com>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, Tony Luck <tony.luck@intel.com>, Fenghua Yu <fenghua.yu@intel.com>, linux-ia64@vger.kernel.org


* Tejun Heo <tj@kernel.org> wrote:

> Jiri Kosina wrote:
> > pcpu_alloc() and pcpu_extend_area_map() perform a series of
> > spin_lock_irq()/spin_unlock_irq() calls, which make them unsafe
> > with respect to being called from contexts which have IRQs off.
> > 
> > This patch converts the code to perform save/restore of flags instead,
> > making pcpu_alloc() (or __alloc_percpu() respectively) to be called
> > from early kernel startup stage, where IRQs are off.
> > 
> > This is needed for proper initialization of per-cpu rq_weight data from
> > sched_init().
> > 
> > Signed-off-by: Jiri Kosina <jkosina@suse.cz>
> 
> Acked-by: Tejun Heo <tj@kernel.org>
> 
> I'll wait for response on the series and push it through percpu#fixes 
> tomorrow if there's no objection.

Yep, the 2/2 sched.c patch looks good now:

  Acked-by: Ingo Molnar <mingo@elte.hu>

	Ingo