linux-kernel - Re: [PATCH 2/3] mm, bootmem: panic in bootmem alloc functions even if slab is available

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Message-ID: <alpine.DEB.2.00.1212271502070.23127@chino.kir.corp.google.com>
Date:	Thu, 27 Dec 2012 15:04:12 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Sasha Levin <sasha.levin@...cle.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	"David S. Miller" <davem@...emloft.net>, Tejun Heo <tj@...nel.org>,
	Joonsoo Kim <js1304@...il.com>,
	Yinghai Lu <yinghai@...nel.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] mm, bootmem: panic in bootmem alloc functions even
 if slab is available

On Thu, 27 Dec 2012, Sasha Levin wrote:

> That's exactly what happens with the patch. Note that in the current upstream
> version there are several slab checks scattered all over.
> 
> In this case for example, I'm removing it from __alloc_bootmem_node(), but the
> first code line of__alloc_bootmem_node_nopanic() is:
> 
>         if (WARN_ON_ONCE(slab_is_available()))
>                 return kzalloc(size, GFP_NOWAIT);
> 

You're only talking about mm/bootmem.c and not mm/nobootmem.c, and notice 
that __alloc_bootmem_node() does not call __alloc_bootmem_node_nopanic(), 
it calls ___alloc_bootmem_node_nopanic().
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