From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758774Ab3EWRgS (ORCPT ); Thu, 23 May 2013 13:36:18 -0400 Received: from hrndva-omtalb.mail.rr.com ([71.74.56.122]:22169 "EHLO hrndva-omtalb.mail.rr.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758340Ab3EWRgQ (ORCPT ); Thu, 23 May 2013 13:36:16 -0400 X-Authority-Analysis: v=2.0 cv=UO1f7Vjy c=1 sm=0 a=rXTBtCOcEpjy1lPqhTCpEQ==:17 a=mNMOxpOpBa8A:10 a=rKI68ldaRsEA:10 a=5SG0PmZfjMsA:10 a=IkcTkHD0fZMA:10 a=meVymXHHAAAA:8 a=54K5z7jWVYMA:10 a=naBF9QOQ4sV8pCfsjTEA:9 a=QEXdDO2ut3YA:10 a=rXTBtCOcEpjy1lPqhTCpEQ==:117 X-Cloudmark-Score: 0 X-Authenticated-User: X-Originating-IP: 74.67.115.198 Message-ID: <1369330573.6828.200.camel@gandalf.local.home> Subject: Re: [PATCH] mm: fix up a spurious page fault whenever it happens From: Steven Rostedt To: "H. Peter Anvin" Cc: Rik van Riel , Stanislav Meduna , Linus Torvalds , "linux-rt-users@vger.kernel.org" , "linux-kernel@vger.kernel.org" , Thomas Gleixner , Ingo Molnar , the arch/x86 maintainers , Hai Huang Date: Thu, 23 May 2013 13:36:13 -0400 In-Reply-To: <519E50B6.6070101@zytor.com> References: <5195ED8B.7060002@meduna.org> <1369183168.6828.168.camel@gandalf.local.home> <519CBB30.3060200@redhat.com> <20130522134111.33a695c5@cuia.bos.redhat.com> <519D08B0.8050707@meduna.org> <1369246316.6828.176.camel@gandalf.local.home> <519D0CAB.7020800@meduna.org> <519D0FF8.5080200@redhat.com> <519D118B.6010306@zytor.com> <519D11BF.5000604@redhat.com> <519DCE2A.4010801@meduna.org> <519E095A.4000105@redhat.com> <1369315769.6828.198.camel@gandalf.local.home> <519E3089.8040701@zytor.com> <1369322836.6828.199.camel@gandalf.local.home> <519E50B6.6070101@zytor.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.4.4-3 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 2013-05-23 at 10:24 -0700, H. Peter Anvin wrote: > On 05/23/2013 08:27 AM, Steven Rostedt wrote: > > On Thu, 2013-05-23 at 08:06 -0700, H. Peter Anvin wrote: > > > >> We don't even need the jump_label infrastructure -- we have > >> static_cpu_has*() which actually predates jump_label although it uses > >> the same underlying ideas. > > > > Ah right. I wonder if it would be worth consolidating a lot of these > > "modifying of code" infrastructures. Which reminds me, I need to update > > text_poke() to do things similar to what ftrace does, and get rid of the > > stop machine code. > > > > Well, static_cpu_has*() just uses the alternatives infrastructure. And as it's a boot time change only, it's not quite in the category of jump_labels and function tracing. -- Steve