linux-kernel - Re: [PATCH 14/19] powerpc/altivec: Add missing prototypes for altivec

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Date:   Tue, 27 Mar 2018 17:58:06 +0200
From:   LEROY Christophe <christophe.leroy@....fr>
To:     Mathieu Malaterre <malat@...ian.org>
Cc:     Michael Ellerman <mpe@...erman.id.au>,
        LKML <linux-kernel@...r.kernel.org>, kvm-ppc@...r.kernel.org,
        Paul Mackerras <paulus@...ba.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH 14/19] powerpc/altivec: Add missing prototypes for
 altivec

Mathieu Malaterre <malat@...ian.org> a écrit :

> Christophe,
>
> On Sat, Mar 24, 2018 at 9:10 PM, LEROY Christophe
> <christophe.leroy@....fr> wrote:
>> Mathieu Malaterre <malat@...ian.org> a écrit :
>>
>>
>>> On Fri, Mar 23, 2018 at 1:19 PM, christophe leroy
>>> <christophe.leroy@....fr> wrote:
>>>>
>>>>
>>>>
>>>> Le 22/03/2018 à 21:20, Mathieu Malaterre a écrit :
>>>>>
>>>>>
>>>>> Some functions prototypes were missing for the non-altivec code. Add the
>>>>> missing prototypes directly in xor_vmx, fix warnings treated as errors
>>>>> with
>>>>> W=1:
>>>>>
>>>>>    arch/powerpc/lib/xor_vmx_glue.c:18:6: error: no previous prototype
>>>>> for
>>>>> ‘xor_altivec_2’ [-Werror=missing-prototypes]
>>>>>    arch/powerpc/lib/xor_vmx_glue.c:29:6: error: no previous prototype
>>>>> for
>>>>> ‘xor_altivec_3’ [-Werror=missing-prototypes]
>>>>>    arch/powerpc/lib/xor_vmx_glue.c:40:6: error: no previous prototype
>>>>> for
>>>>> ‘xor_altivec_4’ [-Werror=missing-prototypes]
>>>>>    arch/powerpc/lib/xor_vmx_glue.c:52:6: error: no previous prototype
>>>>> for
>>>>> ‘xor_altivec_5’ [-Werror=missing-prototypes]
>>>>>
>>>>> Signed-off-by: Mathieu Malaterre <malat@...ian.org>
>>>>> ---
>>>>>   arch/powerpc/lib/xor_vmx.h | 14 ++++++++++++++
>>>>>   1 file changed, 14 insertions(+)
>>>>>
>>>>> diff --git a/arch/powerpc/lib/xor_vmx.h b/arch/powerpc/lib/xor_vmx.h
>>>>> index 5c2b0839b179..2173e3c84151 100644
>>>>> --- a/arch/powerpc/lib/xor_vmx.h
>>>>> +++ b/arch/powerpc/lib/xor_vmx.h
>>>>> @@ -19,3 +19,17 @@ void __xor_altivec_4(unsigned long bytes, unsigned
>>>>> long
>>>>> *v1_in,
>>>>>   void __xor_altivec_5(unsigned long bytes, unsigned long *v1_in,
>>>>>                              unsigned long *v2_in, unsigned long *v3_in,
>>>>>                              unsigned long *v4_in, unsigned long
>>>>> *v5_in);
>>>>> +
>>>>> +void xor_altivec_2(unsigned long bytes, unsigned long *v1_in,
>>>>> +                            unsigned long *v2_in);
>>>>> +
>>>>
>>>>
>>>>
>>>> Only used in one place, should be static instead of adding it in a .h
>>>>
>>>> Same for the other ones.
>>>
>>>
>>> $ git grep xor_altivec_2
>>> [...]
>>> arch/powerpc/lib/xor_vmx_glue.c:EXPORT_SYMBOL(xor_altivec_2);
>>>
>>> Are you sure I can change this function to static ?
>>
>>
>> Yes you are right.  But in fact those fonctions are already defined in
>> asm/xor. h
>> So you just need to add the missing #include
>
> I originally tried it, but this leads to:
>
>   CC      arch/powerpc/lib/xor_vmx_glue.o
> In file included from arch/powerpc/lib/xor_vmx_glue.c:16:0:
> ./arch/powerpc/include/asm/xor.h:39:15: error: variable
> ‘xor_block_altivec’ has initializer but incomplete type
>  static struct xor_block_template xor_block_altivec = {
>                ^~~~~~~~~~~~~~~~~~
> ./arch/powerpc/include/asm/xor.h:40:2: error: unknown field ‘name’
> specified in initializer
>   .name = "altivec",
>   ^
> [...]
>
> The file <asm/xor.h> (powerpc) is pretty much expected to be included
> after <include/linux/raid/xor.h>.
>
> I did not want to tweak <asm/xor.h> to test for #ifdef _XOR_H just before
>
> #ifdef _XOR_H
> static struct xor_block_template xor_block_altivec = {
> [...]
>
> since this seems like a hack to me.
>
> Is this ok to test for #ifdef _XOR_H in <arch/powerpc/include/asm/xor.h> ?

What about including linux/raid/xor.h in asm/xor.h ?

Christophe
>
>> Christophe
>>
>>
>>>
>>>> Christophe
>>>>
>>>>
>>>>> +void xor_altivec_3(unsigned long bytes, unsigned long *v1_in,
>>>>> +                            unsigned long *v2_in, unsigned long
>>>>> *v3_in);
>>>>> +
>>>>> +void xor_altivec_4(unsigned long bytes, unsigned long *v1_in,
>>>>> +                            unsigned long *v2_in, unsigned long *v3_in,
>>>>> +                            unsigned long *v4_in);
>>>>> +
>>>>> +void xor_altivec_5(unsigned long bytes, unsigned long *v1_in,
>>>>> +                            unsigned long *v2_in, unsigned long *v3_in,
>>>>> +                            unsigned long *v4_in, unsigned long
>>>>> *v5_in);
>>>>>
>>>>
>>>> ---
>>>> L'absence de virus dans ce courrier électronique a été vérifiée par le
>>>> logiciel antivirus Avast.
>>>> https://www.avast.com/antivirus
>>>>
>>
>>