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    Subject[PATCH 6/9] MIPS: cevt-r4k: Make interrupt handler shared
    Date
    Make the cevt-r4k interrupt handler shared so that other interrupt
    handlers (specifically the performance counter overflow handler and fast
    debug channel interrupt handler) can share the same interrupt line.

    This simply imvolves returning IRQ_NONE when no timer interrupt has been
    handled to allow other handlers to run, and passing IRQF_SHARED when
    setting up the IRQ handler so that other handlers (with compatible
    flags) can be registered.

    Signed-off-by: James Hogan <james.hogan@imgtec.com>
    Cc: Ralf Baechle <ralf@linux-mips.org>
    Cc: linux-mips@linux-mips.org
    ---
    arch/mips/kernel/cevt-r4k.c | 8 +++++++-
    1 file changed, 7 insertions(+), 1 deletion(-)

    diff --git a/arch/mips/kernel/cevt-r4k.c b/arch/mips/kernel/cevt-r4k.c
    index d68a678b7e4e..8044981e9399 100644
    --- a/arch/mips/kernel/cevt-r4k.c
    +++ b/arch/mips/kernel/cevt-r4k.c
    @@ -81,6 +81,8 @@ irqreturn_t c0_compare_interrupt(int irq, void *dev_id)
    write_c0_compare(read_c0_compare());
    cd = &per_cpu(mips_clockevent_device, cpu);
    cd->event_handler(cd);
    + } else {
    + return IRQ_NONE;
    }

    out:
    @@ -89,7 +91,11 @@ out:

    struct irqaction c0_compare_irqaction = {
    .handler = c0_compare_interrupt,
    - .flags = IRQF_PERCPU | IRQF_TIMER,
    + /*
    + * IRQF_SHARED: The timer interrupt may be shared with other interrupts
    + * such as perf counter and FDC interrupts.
    + */
    + .flags = IRQF_PERCPU | IRQF_TIMER | IRQF_SHARED,
    .name = "timer",
    };

    --
    2.0.5


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