Quoting Douglas Anderson (2023-08-24 08:30:29) > From: Mark Rutland <[email protected]> > > 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 <[email protected]> > Signed-off-by: Douglas Anderson <[email protected]> > Cc: Catalin Marinas <[email protected]> > Cc: Marc Zyngier <[email protected]> > Cc: Sumit Garg <[email protected]> > Cc: Will Deacon <[email protected]> > ---
Reviewed-by: Stephen Boyd <[email protected]> _______________________________________________ Kgdb-bugreport mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/kgdb-bugreport
