linux-kernel - Re: [PATCH] mm: move page_ext_init after all struct pages are initialized

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Message-Id: <20160519153007.322150e4253656a3ac963656@linux-foundation.org>
Date:	Thu, 19 May 2016 15:30:07 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Yang Shi <yang.shi@...aro.org>
Cc:	iamjoonsoo.kim@....com, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, linaro-kernel@...ts.linaro.org
Subject: Re: [PATCH] mm: move page_ext_init after all struct pages are
 initialized

On Thu, 19 May 2016 14:29:05 -0700 Yang Shi <yang.shi@...aro.org> wrote:

> When DEFERRED_STRUCT_PAGE_INIT is enabled, just a subset of memmap at boot
> are initialized, then the rest are initialized in parallel by starting one-off
> "pgdatinitX" kernel thread for each node X.
> 
> If page_ext_init is called before it, some pages will not have valid extension,
> so move page_ext_init() after it.
> 

<stdreply>When fixing a bug, please fully describe the end-user impact
of that bug</>