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arm64: smp: IPI_CPU_STOP and IPI_CPU_CRASH_STOP should try for NMI

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There's no reason why IPI_CPU_STOP and IPI_CPU_CRASH_STOP can't be
handled as NMI. They are very simple and everything in them is
NMI-safe. Mark them as things to use NMI for if NMI is available.

Suggested-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Reviewed-by: Misono Tomohiro <misono.tomohiro@fujitsu.com>
Reviewed-by: Sumit Garg <sumit.garg@linaro.org>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Tested-by: Mark Rutland <mark.rutland@arm.com>
Tested-by: Chen-Yu Tsai <wenst@chromium.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/20230906090246.v13.5.Ifadbfd45b22c52edcb499034dd4783d096343260@changeid
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Douglas Anderson 2023-09-06 09:03:00 -07:00 committed by Catalin Marinas
parent 331a1b3a83
commit d7402513c9
1 changed files with 2 additions and 0 deletions
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2
arch/arm64/kernel/smp.c
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@ -946,6 +946,8 @@ static bool ipi_should_be_nmi(enum ipi_msg_type ipi)
return false; return false;
switch (ipi) { switch (ipi) {
case IPI_CPU_STOP:
case IPI_CPU_CRASH_STOP:
case IPI_CPU_BACKTRACE: case IPI_CPU_BACKTRACE:
return true; return true;
default: default: