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    SubjectRe: [PATCH PREEMPT_RT]: On AT91 ARM: GPIO Interrupt handling can/will stall forever
    On Wed, Nov 28, 2007 at 04:13:07PM -0500, Steven Rostedt wrote:
    > On Wed, 28 Nov 2007, Daniel Walker wrote:
    > >
    > > Ignoring the ARM side of things for a sec, handle_simple_irq() will
    > > mask() the interrupt in the special case that an interrupt is already in
    > > the processes of being handled.. handle_simple_irq() also unmasks when
    > > it finishes handling an interrupt (something real time adds for some
    > > reason) ..
    > >
    > > In terms of threading the irq everything is the same except there is no
    > > unmask() call when the thread finishes ..
    > >
    > OK, to be honest, I never fully understood the concept of this
    > "simple_irq". I figured it was because of the ARM architecture.

    If you read what I said compared with what Daniel said, you'll see that
    adding the mask/unmask is _pointless_ because for the case where the
    simple handler should be used, there is _no_ hardware masking available
    except via the parent interrupt signal.

    So actually Daniel's argument misses the basic point - that using
    handle_simple_irq for non-simple IRQs is just WRONG.
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      Last update: 2007-11-29 00:07    [W:0.019 / U:55.908 seconds]
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