powerpc/powernv: POWER9 support for msgsnd/doorbell IPI
POWER9 requires msgsync for receiver-side synchronization, and a DD1 workaround restricts IPIs to core-local. Signed-off-by: NNicholas Piggin <npiggin@gmail.com> [mpe: Drop no longer needed asm feature macro changes] Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
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