From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pa0-f70.google.com (mail-pa0-f70.google.com [209.85.220.70]) by kanga.kvack.org (Postfix) with ESMTP id 174836B0005 for ; Thu, 19 May 2016 19:21:09 -0400 (EDT) Received: by mail-pa0-f70.google.com with SMTP id gw7so134586671pac.0 for ; Thu, 19 May 2016 16:21:09 -0700 (PDT) Received: from mail.linuxfoundation.org (mail.linuxfoundation.org. [140.211.169.12]) by mx.google.com with ESMTPS id u62si23130574pfi.160.2016.05.19.16.21.08 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 19 May 2016 16:21:08 -0700 (PDT) Date: Thu, 19 May 2016 16:21:07 -0700 From: Andrew Morton Subject: Re: [PATCH] mm: move page_ext_init after all struct pages are initialized Message-Id: <20160519162107.372d19eac129d590ea160203@linux-foundation.org> In-Reply-To: <6dd46bac-a0e4-d3c0-ded3-cbacc7f4a4ff@linaro.org> References: <1463693345-30842-1-git-send-email-yang.shi@linaro.org> <20160519153007.322150e4253656a3ac963656@linux-foundation.org> <6dd46bac-a0e4-d3c0-ded3-cbacc7f4a4ff@linaro.org> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: "Shi, Yang" Cc: iamjoonsoo.kim@lge.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linaro-kernel@lists.linaro.org On Thu, 19 May 2016 15:35:15 -0700 "Shi, Yang" wrote: > On 5/19/2016 3:30 PM, Andrew Morton wrote: > > On Thu, 19 May 2016 14:29:05 -0700 Yang Shi 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. > >> > > > > When fixing a bug, please fully describe the end-user impact > > of that bug > > The kernel ran into the below oops which is same with the oops reported > in > http://ozlabs.org/~akpm/mmots/broken-out/mm-page_is_guard-return-false-when-page_ext-arrays-are-not-allocated-yet.patch. So this patch makes mm-page_is_guard-return-false-when-page_ext-arrays-are-not-allocated-yet.patch obsolete? -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org