Eric Lee / smarc-fsl-linux-kernel

04 Oct, 2011

1 commit

  • 38aaf8090   irq_work: Use llist in the struct irq_work logic ... Browse Code »

    Use llist in irq_work instead of the lock-less linked list
    implementation in irq_work to avoid the code duplication.

    Signed-off-by: Huang Ying
    Signed-off-by: Peter Zijlstra
    Link: http://lkml.kernel.org/r/1315461646-1379-6-git-send-email-ying.huang@intel.com
    Signed-off-by: Ingo Molnar

    Huang Ying
     

19 Oct, 2010

1 commit

  • e360adbe2   irq_work: Add generic hardirq context callbacks ... Browse Code »
    2

    Provide a mechanism that allows running code in IRQ context. It is
    most useful for NMI code that needs to interact with the rest of the
    system -- like wakeup a task to drain buffers.

    Perf currently has such a mechanism, so extract that and provide it as
    a generic feature, independent of perf so that others may also
    benefit.

    The IRQ context callback is generated through self-IPIs where
    possible, or on architectures like powerpc the decrementer (the
    built-in timer facility) is set to generate an interrupt immediately.

    Architectures that don't have anything like this get to do with a
    callback from the timer tick. These architectures can call
    irq_work_run() at the tail of any IRQ handlers that might enqueue such
    work (like the perf IRQ handler) to avoid undue latencies in
    processing the work.

    Signed-off-by: Peter Zijlstra
    Acked-by: Kyle McMartin
    Acked-by: Martin Schwidefsky
    [ various fixes ]
    Signed-off-by: Huang Ying
    LKML-Reference:
    Signed-off-by: Ingo Molnar

    Peter Zijlstra