From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mailapp01.imgtec.com ([195.59.15.196]:58959 "EHLO mailapp01.imgtec.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752274AbbHDUrO (ORCPT ); Tue, 4 Aug 2015 16:47:14 -0400 Message-ID: <55C124CE.3070209@imgtec.com> Date: Tue, 4 Aug 2015 13:47:10 -0700 From: Leonid Yegoshin MIME-Version: 1.0 To: David Daney CC: David Daney , , , David Daney , Subject: Re: MIPS: Make set_pte() SMP safe. References: <1438649323-1082-1-git-send-email-ddaney.cavm@gmail.com> <55C10F4B.2050003@imgtec.com> <55C11A37.5070509@caviumnetworks.com> <55C1214F.8050208@imgtec.com> <55C12263.7070407@imgtec.com> <55C122D7.3040803@caviumnetworks.com> In-Reply-To: <55C122D7.3040803@caviumnetworks.com> Content-Type: text/plain; charset="utf-8"; format=flowed Content-Transfer-Encoding: 7bit Sender: stable-owner@vger.kernel.org List-ID: On 08/04/2015 01:38 PM, David Daney wrote: > I don't know what the purpose of guard pages is. I thought it was to > produce an OOPs message if you accessed just beyond the end of the > vmap area. If people are using them for some other reason, then I am > not aware of it. > > Right, but if you have a buddy problem then it means that in your case the guard page IS USED... and doesn't produce OOPs.