linux-kernel - Re: [PATCH v5 03/14] ARM: mvebu: ll_set_cpu

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Date:	Wed, 26 Mar 2014 12:51:19 +0100
From:	Gregory CLEMENT <gregory.clement@...e-electrons.com>
To:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>, linux-pm@...r.kernel.org,
	Jason Cooper <jason@...edaemon.net>,
	Andrew Lunn <andrew@...n.ch>
CC:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
	linux-arm-kernel@...ts.infradead.org,
	Lior Amsalem <alior@...vell.com>,
	Tawfik Bayouk <tawfik@...vell.com>,
	Nadav Haklai <nadavh@...vell.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 03/14] ARM: mvebu: ll_set_cpu_coherent always uses
 the current CPU

On 26/03/2014 12:52, Sebastian Hesselbarth wrote:
> On 03/25/2014 11:48 PM, Gregory CLEMENT wrote:
>> ll_set_cpu_coherent is always used on the current CPU, so instead of
>> passing the CPU id as argument, ll_set_cpu_coherent() can find it by
>> itself.
>>
>> Signed-off-by: Gregory CLEMENT <gregory.clement@...e-electrons.com>
>> Acked-by: Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
>> ---
> [...]
>> diff --git a/arch/arm/mach-mvebu/coherency_ll.S b/arch/arm/mach-mvebu/coherency_ll.S
>> index 1f2bcd4b5424..6cb26b919787 100644
>> --- a/arch/arm/mach-mvebu/coherency_ll.S
>> +++ b/arch/arm/mach-mvebu/coherency_ll.S
>> @@ -24,9 +24,7 @@
>>   #include <asm/cp15.h>
>>
>>   	.text
>> -/*
>> - * r0: HW CPU id
>> - */
>> +
>>   ENTRY(ll_set_cpu_coherent)
>>   	mrc	p15, 0, r1, c1, c0, 0
>>   	tst	r1, #CR_M @ Check MMU bit enabled
>> @@ -43,9 +41,11 @@ ENTRY(ll_set_cpu_coherent)
>>   	ldr	r0, [r0]
>>   2:
>>   	/* Create bit by cpu index */
>> -	mov	r3, #(1 << 24)
>> -	lsl	r1, r3, r1
>> -ARM_BE8(rev	r1, r1)
>> +	mrc	15, 0, r1, cr0, cr0, 5
>> +	and	r1, r1, #15
>> +	mov	r2, #(1 << 24)
>> +	lsl	r1, r2, r1
>> +	ARM_BE8(rev	r1, r1)
> 
> nit: re-indent ARM_BE8 to the beginning of the line?

Good catch!

Thanks,

Gregory




> Sebastian
> 


-- 
Gregory Clement, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com
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