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

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Date:   Tue, 27 Mar 2018 10:39:52 +0200
From:   Mathieu Malaterre <malat@...ian.org>
To:     LEROY Christophe <christophe.leroy@....fr>
Cc:     linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        Paul Mackerras <paulus@...ba.org>, kvm-ppc@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        Michael Ellerman <mpe@...erman.id.au>
Subject: Re: [PATCH 14/19] powerpc/altivec: Add missing prototypes for altivec

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> ?

> 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
>>>
>
>