linux-kernel - Re: [PATCH] fix: x86: remove cpu_vendor

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Message-ID: <20081001073636.GE9366@elte.hu>
Date:	Wed, 1 Oct 2008 09:36:36 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Alexander van Heukelum <heukelum@...lshack.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] fix: x86: remove cpu_vendor_dev


* Yinghai Lu <yinghai@...nel.org> wrote:

> On Tue, Sep 30, 2008 at 11:49 PM, Ingo Molnar <mingo@...e.hu> wrote:
> >
> > * Yinghai Lu <yinghai@...nel.org> wrote:
> >
> >> On Tue, Sep 30, 2008 at 12:37 PM, Alexander van Heukelum
> >> <heukelum@...lshack.com> wrote:
> >> > x86_64-kernels after commit 10a434fcb "x86: remove cpu_vendor_dev"
> >> > crashed on qemu-system-x86_64 due to a typo in vmlinux_64.lds.S.
> >> >
> >> > Signed-off-by: Alexander van Heukelum <heukelum@...tmail.fm>
> >> >
> >> > ---
> >> >
> >> > On Tue, Sep 30, 2008 at 06:41:33PM +0200, Alexander van Heukelum wrote:
> >> >> Moreover, a defconfig won't run :-/ (on qemu-system-x86_64).
> >> >> Bisection pointed to commit 10a434fcb "x86: remove cpu_vendor_dev".
> >> >> The kernel crashes early with a general protection fault in a call
> >> >> to strnlen. I have no idea what goes wrong, yet.
> >> >
> >> > It took quite some time, but I found the problem... I'll leave
> >> > the other one to you ;).
> >> >
> >> > Greetings,
> >> >        Alexander
> >> >
> >> >  arch/x86/kernel/vmlinux_64.lds.S |    2 +-
> >> >  1 files changed, 1 insertions(+), 1 deletions(-)
> >> >
> >> > diff --git a/arch/x86/kernel/vmlinux_64.lds.S b/arch/x86/kernel/vmlinux_64.lds.S
> >> > index 201e81a..46e0544 100644
> >> > --- a/arch/x86/kernel/vmlinux_64.lds.S
> >> > +++ b/arch/x86/kernel/vmlinux_64.lds.S
> >> > @@ -172,8 +172,8 @@ SECTIONS
> >> >   .x86_cpu_dev.init : AT(ADDR(.x86_cpu_dev.init) - LOAD_OFFSET) {
> >> >        *(.x86_cpu_dev.init)
> >> >   }
> >> > -  SECURITY_INIT
> >> >   __x86_cpu_dev_end = .;
> >> > +  SECURITY_INIT
> >> >
> >> >   . = ALIGN(8);
> >> >   .parainstructions : AT(ADDR(.parainstructions) - LOAD_OFFSET) {
> >> >
> >>
> >> that is merging problem, Ingo should fix that already...
> >
> > indeed. I've fixed it in tip/x86/traps by applying Alexander's patch.
> >
> 
> still have merging problem... in tip/master we have
> 
>   __x86_cpu_dev_start = .;
>   .x86_cpu_dev.init : AT(ADDR(.x86_cpu_dev.init) - LOAD_OFFSET) {
>         *(.x86_cpu_dev.init)
>   }
>   __x86_cpu_dev_end = .;
>   SECURITY_INIT
> 
>   DYN_ARRAY_INIT(8)
> 
>   SECURITY_INIT
> 
> there is two copy of SECURITY_INIT

indeed. I fixed this up now.

interestingly, this seems to be one of the rare cases where Git 
auto-merge does the wrong thing - tt should have detected a conflict.

	Ingo
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