• Thomas Gleixner's avatar
    genirq: Prevent spurious detection for unconditionally polled interrupts · b39898cd
    Thomas Gleixner authored
    On a 68k platform a couple of interrupts are demultiplexed and
    "polled" from a top level interrupt. Unfortunately there is no way to
    determine which of the sub interrupts raised the top level interrupt,
    so all of the demultiplexed interrupt handlers need to be
    invoked. Given a high enough frequency this can trigger the spurious
    interrupt detection mechanism, if one of the demultiplex interrupts
    returns IRQ_NONE continuously. But this is a false positive as the
    polling causes this behaviour and not buggy hardware/software.
    
    Introduce IRQ_POLLED which can be set at interrupt chip setup time via
    irq_set_status_flags(). The flag excludes the interrupt from the
    spurious detector and from all core polling activities.
    Reported-and-tested-by: default avatarMichael Schmitz <schmitzmic@gmail.com>
    Cc: Geert Uytterhoeven <geert@linux-m68k.org>
    Cc: linux-m68k@vger.kernel.org
    Link: http://lkml.kernel.org/r/alpine.DEB.2.02.1311061149250.23353@ionos.tec.linutronix.de
    b39898cd
settings.h 4.05 KB