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.rutl...@arm.com> Reviewed-by: Stephen Boyd <swb...@chromium.org> Reviewed-by: Misono Tomohiro <misono.tomoh...@fujitsu.com> Reviewed-by: Sumit Garg <sumit.g...@linaro.org> Acked-by: Mark Rutland <mark.rutl...@arm.com> Tested-by: Mark Rutland <mark.rutl...@arm.com> Tested-by: Chen-Yu Tsai <we...@chromium.org> Signed-off-by: Douglas Anderson <diand...@chromium.org> --- This patch is tested by Mark Rutland's LKDTM test [1]. [1] http://lore.kernel.org/lkml/20230831101026.3122590-1-mark.rutl...@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 _______________________________________________ Kgdb-bugreport mailing list Kgdb-bugreport@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kgdb-bugreport
