linux-kernel - Re: [RFC PATCH v2 02/12] powerpc/ptrace: drop unnecessary #ifdefs CONFIG

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Date:   Fri, 28 Jun 2019 18:39:53 +0200
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Andreas Schwab <schwab@...ux-m68k.org>
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>, mikey@...ling.org,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [RFC PATCH v2 02/12] powerpc/ptrace: drop unnecessary #ifdefs
 CONFIG_PPC64



Le 28/06/2019 à 18:36, Andreas Schwab a écrit :
> On Jun 28 2019, Christophe Leroy <christophe.leroy@....fr> wrote:
> 
>> diff --git a/arch/powerpc/include/uapi/asm/ptrace.h b/arch/powerpc/include/uapi/asm/ptrace.h
>> index f5f1ccc740fc..37d7befbb8dc 100644
>> --- a/arch/powerpc/include/uapi/asm/ptrace.h
>> +++ b/arch/powerpc/include/uapi/asm/ptrace.h
>> @@ -43,12 +43,11 @@ struct pt_regs
>>   	unsigned long link;
>>   	unsigned long xer;
>>   	unsigned long ccr;
>> -#ifdef __powerpc64__
>> -	unsigned long softe;		/* Soft enabled/disabled */
>> -#else
>> -	unsigned long mq;		/* 601 only (not used at present) */
>> +	union {
>> +		unsigned long softe;	/* Soft enabled/disabled */
>> +		unsigned long mq;	/* 601 only (not used at present) */
>>   					/* Used on APUS to hold IPL value. */
>> -#endif
>> +	};
> 
> Anonymous unions are a C11 feature.
> 

Is that a problem ?

Kernel has a minimum GCC requirement of version 4.6, doesn't 4.6 support 
C11 ?

Christophe