linux-kernel - Re: Resume Issues :Exec of NX page, Synaptics Botchup

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Date:	Mon, 23 May 2011 12:10:36 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Parag Warudkar <parag.lkml@...il.com>,
	Fenghua Yu <fenghua.yu@...el.com>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Dmitry Torokhov <dtor@...l.ru>, linux-kernel@...r.kernel.org
Subject: Re: Resume Issues :Exec of NX page, Synaptics Botchup


* Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> On Sun, May 22, 2011 at 3:22 PM, Parag Warudkar <parag.lkml@...il.com> wrote:
> >
> > Now I get a different call trace for the same NX error. (And Synaptics is
> > completely dead this time - not attributable to the patch, it was dumb
> > luck perhaps that it wored last time.)
> 
> Just because I'm crazy, can you double-check that you applied my patch
> and booted the right kernel?
> 
> Because that NX error *really* looks like the call to setup_smep(),
> and the eip still very much looks like something jumped to the
> "__init" region, not the "__cpuinit" region.
> 
> That backtrace really still looks like the same thing.
> 
> Oh, and you should do
> 
> -static int disable_smep __initdata;
> +static int disable_smep __cpuinitdata;
> 
> too, I guess. Not that it should matter for this particular oops.

We have a fix for this queued up in x86/urgent:

 1d487624fcc1: x86, SMEP: Fix section mismatch warnings

which got delayed by weekend latency ... will send these fixes in a couple of 
minutes.

Thanks,

	Ingo

-------------->
>From 1d487624fcc17a40aa67acaa9e8f3815fb7cd0f0 Mon Sep 17 00:00:00 2001
From: Fenghua Yu <fenghua.yu@...el.com>
Date: Fri, 20 May 2011 15:33:17 -0700
Subject: [PATCH] x86, SMEP: Fix section mismatch warnings

Fix these kernel compilation warnings:

 WARNING: arch/x86/built-in.o(.cpuinit.text+0x1e07): Section mismatch ...
 WARNING: arch/x86/built-in.o(.cpuinit.text+0x1b10): Section mismatch ...

introduced by:

  de5397ad5b9a: x86, cpu: Enable/disable Supervisor Mode Execution Protection

Change disable_smep from __initdata to __cpuinitdata.
Change setup_smep() from __init to __cpuinit.

Reported-by: Yinghai Lu <yinghai@...nel.org>
Signed-off-by: Fenghua Yu <fenghua.yu@...el.com>
Cc: Asit K Mallick <asit.k.mallick@...el.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Link: http://lkml.kernel.org/r/1305930797-11409-1-git-send-email-fenghua.yu@intel.com
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 arch/x86/kernel/cpu/common.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index cbc70a2..c8b4162 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -254,7 +254,7 @@ static inline void squash_the_stupid_serial_number(struct cpuinfo_x86 *c)
 }
 #endif
 
-static int disable_smep __initdata;
+static int disable_smep __cpuinitdata;
 static __init int setup_disable_smep(char *arg)
 {
 	disable_smep = 1;
@@ -262,7 +262,7 @@ static __init int setup_disable_smep(char *arg)
 }
 __setup("nosmep", setup_disable_smep);
 
-static __init void setup_smep(struct cpuinfo_x86 *c)
+static __cpuinit void setup_smep(struct cpuinfo_x86 *c)
 {
 	if (cpu_has(c, X86_FEATURE_SMEP)) {
 		if (unlikely(disable_smep)) {
--
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