Quoting Douglas Anderson (2023-08-24 08:30:29) > From: Mark Rutland <mark.rutl...@arm.com> > > To enable NMI backtrace and KGDB's NMI cpu roundup, we need to free up > at least one dedicated IPI. > > On arm64 the IPI_WAKEUP IPI is only used for the ACPI parking protocol, > which itself is only used on some very early ARMv8 systems which > couldn't implement PSCI. > > Remove the IPI_WAKEUP IPI, and rely on the IPI_RESCHEDULE IPI to wake > CPUs from the parked state. This will cause a tiny amonut of redundant > work to check the thread flags, but this is miniscule in relation to the > cost of taking and handling the IPI in the first place. We can safely > handle redundant IPI_RESCHEDULE IPIs, so there should be no functional > impact as a result of this change. > > Signed-off-by: Mark Rutland <mark.rutl...@arm.com> > Signed-off-by: Douglas Anderson <diand...@chromium.org> > Cc: Catalin Marinas <catalin.mari...@arm.com> > Cc: Marc Zyngier <m...@kernel.org> > Cc: Sumit Garg <sumit.g...@linaro.org> > Cc: Will Deacon <w...@kernel.org> > ---
Reviewed-by: Stephen Boyd <swb...@chromium.org> _______________________________________________ Kgdb-bugreport mailing list Kgdb-bugreport@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kgdb-bugreport
