• Martin Schwidefsky's avatar
    [S390] outstanding interrupts vs. smp_send_stop · 85ac7ca5
    Martin Schwidefsky authored
    The panic function will first print the panic message to the console,
    then stop additional cpus with smp_send_stop and finally call the
    function on the panic notifier list.
    In case of an I/O based console the panic message will cause I/O to
    be started and a function on the panic notifier list will wait for the
    completion of the I/O. That does not work if an I/O completion interrupt
    has already been delivered to a cpu that is then stopped by smp_send_stop.
    To break this cyclic dependency add code to smp_send_stop that gives
    the additional cpu the opportunity to complete outstanding interrupts.
    Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
    85ac7ca5
smp.c 27.6 KB