linux-kernel - Re: [PATCH 3/3] mm, meminit: Ensure node is online before checking whether pages are uninitialised

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Message-ID: <alpine.DEB.2.10.1607121627540.118757@chino.kir.corp.google.com>
Date:	Tue, 12 Jul 2016 16:28:07 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Mel Gorman <mgorman@...hsingularity.net>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] mm, meminit: Ensure node is online before checking
 whether pages are uninitialised

On Fri, 8 Jul 2016, Mel Gorman wrote:

> early_page_uninitialised looks up an arbitrary PFN. While a machine without
> node 0 will boot with "mm, page_alloc: Always return a valid node from
> early_pfn_to_nid", it works because it assumes that nodes are always in
> PFN order. This is not guaranteed so this patch adds robustness by always
> checking if the node being checked is online.
> 
> Signed-off-by: Mel Gorman <mgorman@...hsingularity.net>
> Cc: <stable@...r.kernel.org> # 4.2+

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