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powerpc/powernv/idle: Restore AMR/UAMOR/AMOR after idle
In order to implement KUAP (Kernel Userspace Access Protection) on
Power9 we will be using the AMR, and therefore indirectly the
UAMOR/AMOR.
So save/restore these regs in the idle code.
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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