linux-kernel - Re: [PATCH 02/17] x86, lto: Mark all top level asm statements as .text

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Date:   Wed, 27 Mar 2019 15:39:45 +0100
From:   Ingo Molnar <mingo@...nel.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Andi Kleen <andi@...stfloor.org>, Andi Kleen <ak@...ux.intel.com>,
        x86@...nel.org, Andrew Morton <akpm@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>
Subject: Re: [PATCH 02/17] x86, lto: Mark all top level asm statements as
 .text


* Thomas Gleixner <tglx@...utronix.de> wrote:

> Proper fix below.
> 
> Thanks,
> 
> 	tglx
> 
> 8<-------------------
> 
> --- a/arch/x86/include/asm/paravirt_types.h
> +++ b/arch/x86/include/asm/paravirt_types.h
> @@ -367,11 +367,15 @@ extern struct paravirt_patch_template pv
>  	_paravirt_alt(insn_string, "%c[paravirt_typenum]", "%c[paravirt_clobber]")
>  
>  /* Simple instruction patching code. */
> -#define NATIVE_LABEL(a,x,b) "\n\t.globl " a #x "_" #b "\n" a #x "_" #b ":\n\t"
> +#define NATIVE_LABEL(a,x,b) "\n" a #x "_" #b ":\n\t"
>  
>  #define DEF_NATIVE(ops, name, code)					\
> -	__visible extern const char start_##ops##_##name[], end_##ops##_##name[];	\
> -	asm(NATIVE_LABEL("start_", ops, name) code NATIVE_LABEL("end_", ops, name))
> +	static const char start_##ops##_##name[], end_##ops##_##name[]; \
> +	asm(".pushsection .rodata, \"a\"\n"				\
> +	    NATIVE_LABEL("start_", ops, name)				\
> +	    code							\
> +	    NATIVE_LABEL("end_", ops, name)				\
> +	    ".popsection\n")

Acked-by: Ingo Molnar <mingo@...nel.org>

Thanks,

	Ingo