powerpc: use NMI IPI for smp_send_stop

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Use the NMI IPI rather than smp_call_function for smp_send_stop.
Have stopped CPUs hard disable interrupts rather than just soft
disable.

This function is used in crash/panic/shutdown paths to bring other
CPUs down as quickly and reliably as possible, and minimizing their
potential to cause trouble.

Avoiding the Linux smp_call_function infrastructure and (if supported)
using true NMI IPIs makes this more robust.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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Nicholas Piggin 2018-04-01 20:36:13 +10:00 • committed by Michael Ellerman

parent a2b5e056b7

commit 6bed323762

1 changed files with 8 additions and 0 deletions

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arch/powerpc/kernel/smp.c

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