linux-kernel - Re: [GIT PULL] Fix Xen boot with CONFIG_CC

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Date:	Thu, 20 Aug 2009 12:06:44 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Arjan van de Ven <arjan@...radead.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>
Cc:	Ingo Molnar <mingo@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	the arch/x86 maintainers <x86@...nel.org>
Subject: Re: [GIT PULL] Fix Xen boot with CONFIG_CC_STACKPROTECTOR


* Jeremy Fitzhardinge <jeremy@...p.org> wrote:

> Hi Ingo,
> 
> Here's a couple of little changes which prevents an early boot crash
> under Xen, due to the stackprotector preamble using segment registers
> before they're set up.  I only need to disable stackprotector for a
> handful of functions, but unfortunately it looks like it can only be
> disabled on a per-file basis.
> 
> Thanks,
>     J
> 
> The following changes since commit 64f1607ffbbc772685733ea63e6f7f4183df1b16:
>   Linus Torvalds (1):
>         Linux 2.6.31-rc6
> 
> are available in the git repository at:
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen.git bugfix
> 
> Jeremy Fitzhardinge (2):
>       x86: make sure load_percpu_segment has no stackprotector
>       xen: rearrange things to fix stackprotector
> 
>  arch/x86/kernel/cpu/Makefile |    4 ++++
>  arch/x86/xen/Makefile        |    4 ++++
>  arch/x86/xen/enlighten.c     |   22 ++++++++++------------
>  3 files changed, 18 insertions(+), 12 deletions(-)

Pulled into tip:x86/urgent, thanks a lot Jeremy!

Btw., is there any way to turn off stackprotector on a 
per function basis, a GCC attribute perhaps? That would 
be preferable to turning it off for all of common.o.

	Ingo
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