linux-kernel - Re: [PATCH v2] powerpc/8xx: Fix do_mtspr

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Message-ID: <56E8508C.8010409@c-s.fr>
Date:	Tue, 15 Mar 2016 19:12:28 +0100
From:	christophe leroy <christophe.leroy@....fr>
To:	Scott Wood <oss@...error.net>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Michael Ellerman <mpe@...erman.id.au>
Cc:	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v2] powerpc/8xx: Fix do_mtspr_cpu6 build on older
 compilers



Le 15/03/2016 18:41, Scott Wood a écrit :
> On Tue, 2016-03-15 at 14:07 +0100, Christophe Leroy wrote:
>> Some versions of GCC, reportedly before 4.8, fail with
>> arch/powerpc/mm/8xx_mmu.c:139:2: error: memory input 1 is not directly
>> addressable
> "before 4.8" means "< 4.8", not "<= 4.8" -- did you mean "before 4.9"?
I mean it doesn't fail with 4.8.3

Christophe
>
>> Change the one-element array into a simple variable to avoid this.
>>
>> Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
>> Cc: Scott Wood <oss@...error.net>
>> ---
>> Verified with GCC 4.4.4 and GCC 4.8.3
>>
>> v2: compilation result is compliant with CPU6 ERRATA
>>      (using stw/lwz and not stwx/lwzx)
>>
>>   arch/powerpc/include/asm/reg_8xx.h | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/arch/powerpc/include/asm/reg_8xx.h
>> b/arch/powerpc/include/asm/reg_8xx.h
>> index d41412c..94d01f8 100644
>> --- a/arch/powerpc/include/asm/reg_8xx.h
>> +++ b/arch/powerpc/include/asm/reg_8xx.h
>> @@ -53,7 +53,7 @@
>>   #ifdef CONFIG_8xx_CPU6
>>   #define do_mtspr_cpu6(rn, rn_addr, v)	\
>>   	do {								
>> \
>> -		int _reg_cpu6 = rn_addr, _tmp_cpu6[1];		\
>> +		int _reg_cpu6 = rn_addr, _tmp_cpu6;		\
>>   		asm volatile("stw %0, %1;"				\
>>   			     "lwz %0, %1;"				\
>>   			     "mtspr " __stringify(rn) ",%2" :		
>> \
> I thought I tried this with 4.7.2 without success, but now it seems to be
> working...
>
> -Scott
>


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