linux-kernel - Re: [PATCH] x86-32: Fix boot with CONFIG_X86_INVD

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Date:	Thu, 25 Aug 2011 16:21:08 -0400
From:	Arnaud Lacombe <lacombar@...il.com>
To:	Andy Lutomirski <luto@....edu>
Cc:	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] x86-32: Fix boot with CONFIG_X86_INVD_BUG

Hi,

On Thu, Aug 25, 2011 at 4:10 PM, Andy Lutomirski <luto@....edu> wrote:
> entry_32.S contained a hardcoded alternative instruction entry, and
> the format changed in:
>
> commit 59e97e4d6fbcd5b74a94cb48bcbfc6f8478a5e93
> Author: Andy Lutomirski <luto@....edu>
> Date:   Wed Jul 13 09:24:10 2011 -0400
>
>    x86: Make alternative instruction pointers relative
>
> Replace it with the altinstruction_entry macro.  This fixes the
> 32-bit boot with CONFIG_X86_INVD_BUG=y.
>
> Reported-by: Arnaud Lacombe <lacombar@...il.com>
> Signed-off-by: Andy Lutomirski <luto@....edu>
> ---
>
> Arnaud, can you test this?
>
All good.

Tested-by: Arnaud Lacombe <lacombar@...il.com>

Thanks!
 - Arnaud

> Thanks,
> Andy
>
>  arch/x86/kernel/entry_32.S |    8 ++------
>  1 files changed, 2 insertions(+), 6 deletions(-)
>
> diff --git a/arch/x86/kernel/entry_32.S b/arch/x86/kernel/entry_32.S
> index 5c1a9197..f3f6f53 100644
> --- a/arch/x86/kernel/entry_32.S
> +++ b/arch/x86/kernel/entry_32.S
> @@ -54,6 +54,7 @@
>  #include <asm/ftrace.h>
>  #include <asm/irq_vectors.h>
>  #include <asm/cpufeature.h>
> +#include <asm/alternative-asm.h>
>
>  /* Avoid __ASSEMBLER__'ifying <linux/audit.h> just for this.  */
>  #include <linux/elf-em.h>
> @@ -873,12 +874,7 @@ ENTRY(simd_coprocessor_error)
>  661:   pushl_cfi $do_general_protection
>  662:
>  .section .altinstructions,"a"
> -       .balign 4
> -       .long 661b
> -       .long 663f
> -       .word X86_FEATURE_XMM
> -       .byte 662b-661b
> -       .byte 664f-663f
> +       altinstruction_entry 661b, 663f, X86_FEATURE_XMM, 662b-661b, 664f-663f
>  .previous
>  .section .altinstr_replacement,"ax"
>  663:   pushl $do_simd_coprocessor_error
> --
> 1.7.6
>
>
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