Nicholas Piggin 736df58fd5 powerpc/64s: guard optional TIDR SPR with CPU ftr test
The TIDR SPR only exists on POWER9. Avoid accessing it when the
feature bit for it is not set.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Fabiano Rosas <farosas@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211123095231.1036501-3-npiggin@gmail.com
2021-11-24 21:08:56 +11:00
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