linux-kernel - Re: [PATCH] arm64: LLVMLinux: Fix inline arm64 assembly for use with clang

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Date:	Mon, 15 Sep 2014 17:02:41 +0100
From:	Will Deacon <will.deacon@....com>
To:	"behanw@...verseincode.com" <behanw@...verseincode.com>
Cc:	"anderson@...hat.com" <anderson@...hat.com>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"jays.lee@...sung.com" <jays.lee@...sung.com>,
	"msalter@...hat.com" <msalter@...hat.com>,
	"steve.capper@...aro.org" <steve.capper@...aro.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Mark Charlebois <charlebm@...il.com>
Subject: Re: [PATCH] arm64: LLVMLinux: Fix inline arm64 assembly for use with
 clang

On Mon, Sep 15, 2014 at 06:30:15AM +0100, behanw@...verseincode.com wrote:
> From: Mark Charlebois <charlebm@...il.com>
> 
> Remove '#' from immediate parameter in AARCH64 inline assembly in mmu.
> 
> This code now works with both gcc and clang.
> 
> Signed-off-by: Mark Charlebois <charlebm@...il.com>
> Signed-off-by: Behan Webster <behanw@...verseincode.com>
> ---
>  arch/arm64/mm/mmu.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Acked-by: Will Deacon <will.deacon@....com>

Thanks, Behan!

Catalin: please can you pick this up for 3.18? It's probably not worth me
merging it as a fix, since there are other patches needed to get us building
under clang anyway.

Will

> diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
> index c555672..6894ef3 100644
> --- a/arch/arm64/mm/mmu.c
> +++ b/arch/arm64/mm/mmu.c
> @@ -94,7 +94,7 @@ static int __init early_cachepolicy(char *p)
>  	 */
>  	asm volatile(
>  	"	mrs	%0, mair_el1\n"
> -	"	bfi	%0, %1, #%2, #8\n"
> +	"	bfi	%0, %1, %2, #8\n"
>  	"	msr	mair_el1, %0\n"
>  	"	isb\n"
>  	: "=&r" (tmp)
> -- 
> 1.9.1
> 
> 
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