[PATCH v5 15/17] powerpc/64s: Make hash MMU support configurable

[Nicholas Piggin]

Excerpts from Fabiano Rosas's message of November 29, 2021 11:46 pm:
> Nicholas Piggin <npiggin at gmail.com> writes:
> 
>> This adds Kconfig selection which allows 64s hash MMU support to be
>> disabled. It can be disabled if radix support is enabled, the minimum
>> supported CPU type is POWER9 (or higher), and KVM is not selected.
>>
>> Signed-off-by: Nicholas Piggin <npiggin at gmail.com>
>> ---
>>  arch/powerpc/Kconfig                     |  3 ++-
>>  arch/powerpc/include/asm/mmu.h           | 16 +++++++++++++---
>>  arch/powerpc/kernel/dt_cpu_ftrs.c        | 14 ++++++++++----
>>  arch/powerpc/kvm/Kconfig                 |  1 +
>>  arch/powerpc/mm/init_64.c                | 13 +++++++++++--
>>  arch/powerpc/platforms/Kconfig.cputype   | 23 +++++++++++++++++++++--
>>  arch/powerpc/platforms/cell/Kconfig      |  1 +
>>  arch/powerpc/platforms/maple/Kconfig     |  1 +
>>  arch/powerpc/platforms/microwatt/Kconfig |  2 +-
>>  arch/powerpc/platforms/pasemi/Kconfig    |  1 +
>>  arch/powerpc/platforms/powermac/Kconfig  |  1 +
>>  arch/powerpc/platforms/powernv/Kconfig   |  2 +-
> 
> powernv_defconfig brings CONFIG_CXL=m
> 
> ../drivers/misc/cxl/main.c: In function ‘cxl_alloc_sst’:                                                  
> ../drivers/misc/cxl/main.c:127:45: error: ‘mmu_linear_psize’ undeclared (first use in this function); did you mean ‘mmu_virtual_psize’?                                                                              
>   127 |  sstp0 |= (SLB_VSID_KERNEL | mmu_psize_defs[mmu_linear_psize].sllp) << 50;                        
>       |                                             ^~~~~~~~~~~~~~~~                                      
>       |                                             mmu_virtual_psize                                     
> ../drivers/misc/cxl/main.c:127:45: note: each undeclared identifier is reported only once for each function it appears in                                                                                            
> make[4]: *** [../scripts/Makefile.build:287: drivers/misc/cxl/main.o] Error 1 

Gah. I'll have to just make that depend on hash MMU for now.

I won't repost the full series yet it's should just be a one liner.

Thanks,
Nick