linux-kernel - Re: [PATCHv2] x86: fix the initialization of physnode

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Message-ID: <alpine.DEB.2.02.1402011546040.4865@chino.kir.corp.google.com>
Date:	Sat, 1 Feb 2014 15:46:18 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Petr Tesarik <ptesarik@...e.cz>
cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	Jiang Liu <liuj97@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dave Hansen <dave@...1.net>, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv2] x86: fix the initialization of physnode_map

On Sat, 1 Feb 2014, Petr Tesarik wrote:

> With DISCONTIGMEM, the mapping between a pfn and its owning node is
> initialized using data provided by the BIOS. However, the initialization
> may fail if the extents are not aligned to section boundary (64M).
> 
> The symptom of this bug is an early boot failure in pfn_to_page(),
> as it tries to access NODE_DATA(__nid) using index from an unitialized
> element of the physnode_map[] array.
> 
> While the bug is always present, it is more likely to be hit in kdump
> kernels on large machines, because:
> 
> 1. The memory map for a kdump kernel is specified as exactmap, and
>    exactmap is more likely to be unaligned.
> 
> 2. Large reservations are more likely to span across a 64M boundary.
> 
> Signed-off-by: Petr Tesarik <ptesarik@...e.cz>

Acked-by: David Rientjes <rientjes@...gle.com>
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