linux-kernel - Re: [PATCH v2 05/23] x86,entry

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Message-ID: <YZUt2LcgSweZmyJt@zn.tnic>
Date:   Wed, 17 Nov 2021 17:29:12 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org, jpoimboe@...hat.com,
        mark.rutland@....com, dvyukov@...gle.com, seanjc@...gle.com,
        pbonzini@...hat.com, mbenes@...e.cz
Subject: Re: [PATCH v2 05/23] x86,entry_64: Remove .fixup usage

On Wed, Nov 10, 2021 at 11:01:07AM +0100, Peter Zijlstra wrote:
> Place the anonymous .fixup code at the tail of the regular functions.
> 
> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> ---
>  arch/x86/entry/entry_64.S |   13 ++++++-------
>  1 file changed, 6 insertions(+), 7 deletions(-)
> 
> --- a/arch/x86/entry/entry_64.S
> +++ b/arch/x86/entry/entry_64.S
> @@ -735,13 +735,9 @@ SYM_FUNC_START(asm_load_gs_index)
>  	swapgs
>  	FRAME_END
>  	ret
> -SYM_FUNC_END(asm_load_gs_index)
> -EXPORT_SYMBOL(asm_load_gs_index)
>  
> -	_ASM_EXTABLE(.Lgs_change, .Lbad_gs)
> -	.section .fixup, "ax"
>  	/* running with kernelgs */
> -SYM_CODE_START_LOCAL_NOALIGN(.Lbad_gs)
> +.Lbad_gs:
>  	swapgs					/* switch back to user gs */
>  .macro ZAP_GS
>  	/* This can't be a string because the preprocessor needs to see it. */
> @@ -752,8 +748,11 @@ SYM_CODE_START_LOCAL_NOALIGN(.Lbad_gs)
>  	xorl	%eax, %eax
>  	movl	%eax, %gs
>  	jmp	2b
> -SYM_CODE_END(.Lbad_gs)
> -	.previous
> +
> +	_ASM_EXTABLE(.Lgs_change, .Lbad_gs)
> +
> +SYM_FUNC_END(asm_load_gs_index)
> +EXPORT_SYMBOL(asm_load_gs_index)
>  
>  #ifdef CONFIG_XEN_PV
>  /*

Reviewed-by: Borislav Petkov <bp@...e.de>

-- 
Regards/Gruss,
    Boris.

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