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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> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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