linux-kernel - Re: [PATCH 02/22] arm: add new asm macro update

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Message-ID: <20140205180115.GE28140@mudshark.cambridge.arm.com>
Date:	Wed, 5 Feb 2014 18:01:16 +0000
From:	Will Deacon <will.deacon@....com>
To:	Leif Lindholm <leif.lindholm@...aro.org>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
	"patches@...aro.org" <patches@...aro.org>
Subject: Re: [PATCH 02/22] arm: add new asm macro update_sctlr

On Wed, Feb 05, 2014 at 05:03:53PM +0000, Leif Lindholm wrote:
> A new macro for setting/clearing bits in the SCTLR.
> 
> Signed-off-by: Leif Lindholm <leif.lindholm@...aro.org>
> Suggested-by: Will Deacon <will.deacon@....com>
> Cc: Will Deacon <will.deacon@....com>
> ---
>  arch/arm/include/asm/assembler.h |   14 ++++++++++++++
>  1 file changed, 14 insertions(+)

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

(although really minor comment below)

> diff --git a/arch/arm/include/asm/assembler.h b/arch/arm/include/asm/assembler.h
> index 5c22851..e8ca24b 100644
> --- a/arch/arm/include/asm/assembler.h
> +++ b/arch/arm/include/asm/assembler.h
> @@ -383,4 +383,18 @@ THUMB(	orr	\reg , \reg , #PSR_T_BIT	)
>  #endif
>  	.endm
>  
> +#ifdef CONFIG_CPU_CP15
> +/* Macro for setting/clearing bits in sctlr */
> +	.macro	update_sctlr, tmp:req, set=, clear=
> +	mrc	p15, 0, \tmp, c1, c0, 0
> +	.ifnc	\set,
> +	orr	\tmp, \set

I'd prefer the 3-arg form here for consistency (with this macro and the
rest of the file).

Will
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