linux-kernel - Re: [PATCH] nommu: Enable the strict alignment (CR

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Message-ID: <20121203172553.GC14363@n2100.arm.linux.org.uk>
Date:	Mon, 3 Dec 2012 17:25:53 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Armando Visconti <armando.visconti@...com>
Cc:	"hsweeten@...ionengravers.com" <hsweeten@...ionengravers.com>,
	"swarren@...dia.com" <swarren@...dia.com>,
	"nico@...aro.org" <nico@...aro.org>,
	"kgene.kim@...sung.com" <kgene.kim@...sung.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	spear-devel <spear-devel@...t.st.com>
Subject: Re: [PATCH] nommu: Enable the strict alignment (CR_A) bit only if
	ARCH < v6

On Mon, Dec 03, 2012 at 05:44:11PM +0100, Armando Visconti wrote:
> On 11/29/2012 12:04 PM, Armando VISCONTI wrote:
>> This patch keeps disabled the strict alignment CP15 bit for
>> all armv6 and armv7 processor without the mmu. This behaviour
>> is now same as in the mmu case.
>>
>> Signed-off-by: Armando Visconti<armando.visconti@...com>
>> ---
>>   arch/arm/kernel/head-nommu.S |    2 +-
>>   1 files changed, 1 insertions(+), 1 deletions(-)
>>
>> diff --git a/arch/arm/kernel/head-nommu.S b/arch/arm/kernel/head-nommu.S
>> index 278cfc1..2c228a0 100644
>> --- a/arch/arm/kernel/head-nommu.S
>> +++ b/arch/arm/kernel/head-nommu.S
>> @@ -68,7 +68,7 @@ __after_proc_init:
>>   	 * CP15 system control register value returned in r0 from
>>   	 * the CPU init function.
>>   	 */
>> -#ifdef CONFIG_ALIGNMENT_TRAP
>> +#if defined(CONFIG_ALIGNMENT_TRAP)&&  __LINUX_ARM_ARCH__<  6
>>   	orr	r0, r0, #CR_A
>>   #else
>>   	bic	r0, r0, #CR_A
>
> Any feedback on this simple patch?

Well, it brings the nommu version into line with the mmu version, so
it's sensible.  Please put it in the patch system, thanks.
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