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SubjectRe: [PATCH] powerpc: Fix missing declaration of [en/dis]able_kernel_vsx()
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Le 09/03/2021 à 10:16, Geert Uytterhoeven a écrit :
> Hi Christophe,
>
> On Tue, Mar 9, 2021 at 9:52 AM Christophe Leroy
> <christophe.leroy@csgroup.eu> wrote:
>> Le 09/03/2021 à 09:45, Geert Uytterhoeven a écrit :
>>> On Tue, Mar 9, 2021 at 9:39 AM Christophe Leroy
>>> <christophe.leroy@csgroup.eu> wrote:
>>>> Add stub instances of enable_kernel_vsx() and disable_kernel_vsx()
>>>> when CONFIG_VSX is not set, to avoid following build failure.
>>>>
>>>> CC [M] drivers/gpu/drm/amd/amdgpu/../display/dc/calcs/dcn_calcs.o
>>>> In file included from ./drivers/gpu/drm/amd/amdgpu/../display/dc/dm_services_types.h:29,
>>>> from ./drivers/gpu/drm/amd/amdgpu/../display/dc/dm_services.h:37,
>>>> from drivers/gpu/drm/amd/amdgpu/../display/dc/calcs/dcn_calcs.c:27:
>>>> drivers/gpu/drm/amd/amdgpu/../display/dc/calcs/dcn_calcs.c: In function 'dcn_bw_apply_registry_override':
>>>> ./drivers/gpu/drm/amd/amdgpu/../display/dc/os_types.h:64:3: error: implicit declaration of function 'enable_kernel_vsx'; did you mean 'enable_kernel_fp'? [-Werror=implicit-function-declaration]
>>>> 64 | enable_kernel_vsx(); \
>>>> | ^~~~~~~~~~~~~~~~~
>>>> drivers/gpu/drm/amd/amdgpu/../display/dc/calcs/dcn_calcs.c:640:2: note: in expansion of macro 'DC_FP_START'
>>>> 640 | DC_FP_START();
>>>> | ^~~~~~~~~~~
>>>> ./drivers/gpu/drm/amd/amdgpu/../display/dc/os_types.h:75:3: error: implicit declaration of function 'disable_kernel_vsx'; did you mean 'disable_kernel_fp'? [-Werror=implicit-function-declaration]
>>>> 75 | disable_kernel_vsx(); \
>>>> | ^~~~~~~~~~~~~~~~~~
>>>> drivers/gpu/drm/amd/amdgpu/../display/dc/calcs/dcn_calcs.c:676:2: note: in expansion of macro 'DC_FP_END'
>>>> 676 | DC_FP_END();
>>>> | ^~~~~~~~~
>>>> cc1: some warnings being treated as errors
>>>> make[5]: *** [drivers/gpu/drm/amd/amdgpu/../display/dc/calcs/dcn_calcs.o] Error 1
>>>>
>>>> Fixes: 16a9dea110a6 ("amdgpu: Enable initial DCN support on POWER")
>>>> Cc: stable@vger.kernel.org
>>>> Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
>>>
>>> Thanks for your patch!
>>>
>>>> --- a/arch/powerpc/include/asm/switch_to.h
>>>> +++ b/arch/powerpc/include/asm/switch_to.h
>>>> @@ -71,6 +71,16 @@ static inline void disable_kernel_vsx(void)
>>>> {
>>>> msr_check_and_clear(MSR_FP|MSR_VEC|MSR_VSX);
>>>> }
>>>> +#else
>>>> +static inline void enable_kernel_vsx(void)
>>>> +{
>>>> + BUILD_BUG();
>>>> +}
>>>> +
>>>> +static inline void disable_kernel_vsx(void)
>>>> +{
>>>> + BUILD_BUG();
>>>> +}
>>>> #endif
>>>
>>> I'm wondering how this is any better than the current situation: using
>>> BUILD_BUG() will still cause a build failure?
>>
>> No it won't cause a failure. In drivers/gpu/drm/amd/display/dc/os_types.h you have:
>>
>> #define DC_FP_START() { \
>> if (cpu_has_feature(CPU_FTR_VSX_COMP)) { \
>> preempt_disable(); \
>> enable_kernel_vsx(); \
>> } else if (cpu_has_feature(CPU_FTR_ALTIVEC_COMP)) { \
>> preempt_disable(); \
>> enable_kernel_altivec(); \
>> } else if (!cpu_has_feature(CPU_FTR_FPU_UNAVAILABLE)) { \
>> preempt_disable(); \
>> enable_kernel_fp(); \
>> } \
>>
>> When CONFIG_VSX is not selected, cpu_has_feature(CPU_FTR_VSX_COMP) constant folds to 'false' so the
>> call to enable_kernel_vsx() is discarded and the build succeeds.
>
> IC. So you might as well have an empty (dummy) function instead?
>

But with an empty function, you take the risk that one day, someone calls it without checking that
CONFIG_VSX is selected. Here if someone does that, build will fail.

Another solution is to declare a non static prototype of it, like __put_user_bad() for instance. In
that case, the link will fail.

I prefer the BUILD_BUG() approach as I find it cleaner and more explicit, and also because it breaks
the build at compile time, you don't have to wait link time to catch the error.

Christophe

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