[PATCH v4 00/17] powerpc: Make hash MMU code build configurable

[Nicholas Piggin]

Excerpts from Christophe Leroy's message of November 26, 2021 3:35 am:
> 
> 
> Le 25/11/2021 à 17:35, Christophe Leroy a écrit :
>> 
>> 
>> Le 25/11/2021 à 13:50, Nicholas Piggin a écrit :
>>> Now that there's a platform that can make good use of it, here's
>>> a series that can prevent the hash MMU code being built for 64s
>>> platforms that don't need it.
>> 
>> # CONFIG_PPC_64S_HASH_MMU is not set
>> 
>> 
>> <stdin>:1559:2: warning: #warning syscall futex_waitv not implemented 
>> [-Wcpp]
>> arch/powerpc/platforms/cell/spu_base.c: In function '__spu_kernel_slb':
>> arch/powerpc/platforms/cell/spu_base.c:215:38: error: 'mmu_linear_psize' 
>> undeclared (first use in this function); did you mean 'mmu_virtual_psize'?
>>    215 |                 llp = mmu_psize_defs[mmu_linear_psize].sllp;
>>        |                                      ^~~~~~~~~~~~~~~~
>>        |                                      mmu_virtual_psize
>> arch/powerpc/platforms/cell/spu_base.c:215:38: note: each undeclared 
>> identifier is reported only once for each function it appears in
>> make[3]: *** [scripts/Makefile.build:287: 
>> arch/powerpc/platforms/cell/spu_base.o] Error 1
>> make[2]: *** [scripts/Makefile.build:549: arch/powerpc/platforms/cell] 
>> Error 2
>> make[1]: *** [scripts/Makefile.build:549: arch/powerpc/platforms] Error 2
>> make: *** [Makefile:1846: arch/powerpc] Error 2
>> 
>> 
> 
> 
> With CONFIG_SPU_BASE removed, the above voids and I get to the final 
> link with the following errors:

This is building cell platform with POWER9 CPU and !HASH?

We don't have to make that build, just prevent the config. I had that in 
a previous version which also had platforms select hash, but we went to 
just CPU. But now there's no constraint that prevents cell+POWER9 even 
though it doesn't make sense.

Not sure the best way to fix it. I'll think about it.

Thanks,
Nick