From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757198Ab3AYShH (ORCPT ); Fri, 25 Jan 2013 13:37:07 -0500 Received: from mail-ee0-f52.google.com ([74.125.83.52]:63327 "EHLO mail-ee0-f52.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752806Ab3AYShC (ORCPT ); Fri, 25 Jan 2013 13:37:02 -0500 Date: Fri, 25 Jan 2013 19:36:57 +0100 From: Ingo Molnar To: Josh Triplett Cc: Jan Beulich , tglx@linutronix.de, mjg@redhat.com, linux-kernel@vger.kernel.org, hpa@zytor.com Subject: Re: [tip:x86/debug] x86/EFI: Properly init-annotate BGRT code Message-ID: <20130125183657.GB31022@gmail.com> References: <50AFB29F02000078000AAE8E@nat28.tlf.novell.com> <20130124222820.GA11888@jtriplet-mobl1> <5102463602000078000B9761@nat28.tlf.novell.com> <20130125160309.GA15960@leaf> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20130125160309.GA15960@leaf> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Josh Triplett wrote: > On Fri, Jan 25, 2013 at 07:45:42AM +0000, Jan Beulich wrote: > > >>> On 24.01.13 at 23:28, Josh Triplett wrote: > > > On Thu, Jan 24, 2013 at 12:34:21PM -0800, tip-bot for Jan Beulich wrote: > > >> Commit-ID: 13f0e4d2b9e2209f13d5a4122478eb79e6136870 > > >> Gitweb: > > > http://git.kernel.org/tip/13f0e4d2b9e2209f13d5a4122478eb79e6136870 > > >> Author: Jan Beulich > > >> AuthorDate: Fri, 23 Nov 2012 16:30:07 +0000 > > >> Committer: Ingo Molnar > > >> CommitDate: Thu, 24 Jan 2013 17:12:18 +0100 > > >> > > >> x86/EFI: Properly init-annotate BGRT code > > >> > > >> These items are only ever referenced from initialization code. > > > > > > Not true, and this patch will break the BGRT code. bgrt_init, which > > > does indeed have an __init annotation, stores bgrt_image and > > > bgrt_image_size into the .private and .size fields of a sysfs > > > bin_attribute, which does *not* have an __initdata annotation, and which > > > will get read whenever the user reads the corresponding sysfs attribute. > > > > Copying init-only data into a sysfs structure is no problem at all > > - that structure obviously is non-__initdata and hence can be > > read at any time. It was a different thing if .private and/or .size > > stored _pointers_ to one of the two variables in question. > > Ah, I see; the data itself gets kmalloc'd, and you just want > to discard the original pointer and size. Fair enough. Sorry > for the false alarm. Ok - thanks for the clarification - I'll keep the commit as-is, agreed? Thanks, Ingo