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Date: Sat, 26 Jun 2010 16:53:52 -0700 (PDT)
From: David Rientjes <rientjes@google.com>
Subject: Re: [S+Q 09/16] [percpu] make allocpercpu usable during early boot
In-Reply-To: <4C25B610.1050305@kernel.org>
Message-ID: <alpine.DEB.2.00.1006261652440.27174@chino.kir.corp.google.com>
References: <20100625212026.810557229@quilx.com> <20100625212106.384650677@quilx.com> <4C25B610.1050305@kernel.org>
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Sender: owner-linux-mm@kvack.org
To: Tejun Heo <tj@kernel.org>
Cc: Christoph Lameter <cl@linux-foundation.org>, Pekka Enberg <penberg@cs.helsinki.fi>, linux-mm@kvack.org, Nick Piggin <npiggin@suse.de>, Matt Mackall <mpm@selenic.com>
List-ID: <linux-mm.kvack.org>

On Sat, 26 Jun 2010, Tejun Heo wrote:

> On 06/25/2010 11:20 PM, Christoph Lameter wrote:
> > allocpercpu() may be used during early boot after the page allocator
> > has been bootstrapped but when interrupts are still off. Make sure
> > that we do not do GFP_KERNEL allocations if this occurs.
> > 
> > Cc: tj@kernel.org
> > Signed-off-by: Christoph Lameter <cl@linux-foundation.org>
> 
> Acked-by: Tejun Heo <tj@kernel.org>
> 
> Christoph, how do you wanna route these patches?  I already have the
> other two patches in the percpu tree, I can push this there too, which
> then you can pull into the allocator tree.
> 

I think that's great for patches 2 and 3 in this series, but this patch is 
only a bandaid for allocations done in early boot whereas the real fix 
should be within a lower layer such as the slab or page allocator since 
the irq context on the boot cpu is not specific only to percpu.

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