Messages in this thread Patch in this message | | | From | Douglas Anderson <> | Subject | [PATCH v13 5/7] arm64: smp: IPI_CPU_STOP and IPI_CPU_CRASH_STOP should try for NMI | Date | Wed, 6 Sep 2023 09:03:00 -0700 |
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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> --- This patch is tested by Mark Rutland's LKDTM test [1].
[1] http://lore.kernel.org/lkml/20230831101026.3122590-1-mark.rutland@arm.com
(no changes since v10)
Changes in v10: - ("IPI_CPU_STOP and IPI_CPU_CRASH_STOP should try for NMI") new for v10.
arch/arm64/kernel/smp.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c index 28c904ca499a..800c59cf9b64 100644 --- a/arch/arm64/kernel/smp.c +++ b/arch/arm64/kernel/smp.c @@ -946,6 +946,8 @@ static bool ipi_should_be_nmi(enum ipi_msg_type ipi) return false; switch (ipi) { + case IPI_CPU_STOP: + case IPI_CPU_CRASH_STOP: case IPI_CPU_BACKTRACE: return true; default: -- 2.42.0.283.g2d96d420d3-goog
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