linux-kernel - Re: [PATCH] Revert "x86-64, init: Do not set NX bits on non-NX capable hardware"

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Message-ID: <20130520183136.GB5348@dhcp22.suse.cz>
Date:	Mon, 20 May 2013 20:31:36 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	"H. Peter Anvin" <hpa@...ux.intel.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Fernando Luis Vázquez Cao 
	<fernando@....ntt.co.jp>, "Rafael J. Wysocki" <rjw@...k.pl>,
	the arch/x86 maintainers <x86@...nel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Revert "x86-64, init: Do not set NX bits on non-NX
 capable hardware"

On Mon 20-05-13 11:30:31, H. Peter Anvin wrote:
> On 05/20/2013 11:23 AM, Michal Hocko wrote:
> > On Mon 20-05-13 10:21:09, Linus Torvalds wrote:
> >> On Mon, May 20, 2013 at 9:43 AM, Michal Hocko <mhocko@...e.cz> wrote:
> >>>
> >>> The configuration has been posted in the referenced thread:
> >>> https://lkml.org/lkml/2013/5/14/398
> >>
> >> Hmm. That's a regular intel i5 Sandybridge CPU. Which certainly has NX.
> >>
> >> Hmm. secondary_startup_64 isn't __initcode, is it? I think it's used
> >> for resuming the other CPU's too and for CPU hotplug. Yes/no?
> >>
> >> If so early_pmd_flags shouldn't be __initdata, I think.
> >>
> >> Michal, does it work if you don't do the revert, but just remove the
> >> __initdata instead?
> > 
> > Right you are! The following patch on top of your tree fixes the
> > problem. Thanks a lot. I will leave the proper changelog to somebody who
> > is more familiar with the area but AFAIU the real problem is that
> > early_pmd_flags is no longer available beacause the section is gone.
> > 
> 
> I'll write it up and send a pull request to Linus.

Thanks, Peter

-- 
Michal Hocko
SUSE Labs
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