linux-kernel - Re: [PATCH] ARM: Thumb-2: Fix out-of-range offset for Thumb-2 in, proc-macros.S

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Message-ID: <539F98AC.9050105@huawei.com>
Date:	Tue, 17 Jun 2014 09:23:56 +0800
From:	Wang Weidong <wangweidong1@...wei.com>
To:	Will Deacon <will.deacon@....com>
CC:	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"gregory.clement@...e-electrons.com" 
	<gregory.clement@...e-electrons.com>,
	"nico@...aro.org" <nico@...aro.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ARM: Thumb-2: Fix out-of-range offset for Thumb-2 in,
 proc-macros.S

On 2014/6/16 21:49, Will Deacon wrote:
> On Tue, Jun 10, 2014 at 08:00:01AM +0100, Wang Weidong wrote:
>> The STR Instruction Encoding T4 points that the <imm> is in the
>> range 0-255.So split the instruction into two for Thumb-2. Just
>> like commit 874d5d3ccc("ARM: 6623/1: Thumb-2: Fix out-of-range
>> offset for Thumb-2 in proc-v7.S").
>>
>> Signed-off-by: Wang Weidong <wangweidong1@...wei.com>
>> ---
>>  arch/arm/mm/proc-macros.S | 4 +++-
>>  1 file changed, 3 insertions(+), 1 deletion(-)
>>
>> diff --git a/arch/arm/mm/proc-macros.S b/arch/arm/mm/proc-macros.S
>> index ee1d805..63f710c 100644
>> --- a/arch/arm/mm/proc-macros.S
>> +++ b/arch/arm/mm/proc-macros.S
>> @@ -252,7 +252,9 @@
>>  	tst	r3, #L_PTE_PRESENT | L_PTE_YOUNG	@ present and young?
>>  	movne	r2, #0				@ no -> fault
>>  
>> -	str	r2, [r0, #2048]!		@ hardware version
>> + ARM(	str	r2, [r0, #2048]! 		) @ hardware version
>> + THUMB( add	r0, r0, #2048 			)
>> + THUMB( str	r2, [r0] 			)
>>  	mov	ip, #0
>>  	mcr	p15, 0, r0, c7, c10, 1		@ clean L1 D line
>>  	mcr	p15, 0, ip, c7, c10, 4		@ data write barrier
> 
> AFAICT this is in xscale_set_pte_ext_epilogue which should only be built as
> ARM. Are you seeing a real issue here?
> 
> Will
> 

Hi will,

I don't see any issue here. I just review the codes while I learn thumb-2.
It does only build as ARM, so ignore it.

Regards
Wang

> .
> 


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