[PATCH 1/2] powerpc/64s: Rename PPC_INVALIDATE_ERAT to PPC_ARCH_300_INVALIDATE_ERAT

[Nicholas Piggin]

Segher Boessenkool's on June 23, 2019 10:03 pm:
> On Sun, Jun 23, 2019 at 08:41:51PM +1000, Nicholas Piggin wrote:
>> This makes it clear to the caller that it can only be used on POWER9
>> and later CPUs.
> 
>> -#define PPC_INVALIDATE_ERAT	PPC_SLBIA(7)
>> +#define PPC_ARCH_300_INVALIDATE_ERAT	PPC_SLBIA(7)
> 
> The architecture version is 3.0 (or 3.0B), not "300".  This will work on
> implementations of later architecture versions as well, so maybe the name
> isn't so great anyway?

Yeah... this is kernel convention for better or worse. ISA v3.0B
feature support is called CPU_FTR_ARCH_300, and later architectures
will advertise that support. For the most part we can use architected
features (incompatible changes would require additional code).

Thanks,
Nick