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    SubjectRe: i386 IPI handlers running with hardirq_count == 0
    On Thu, 29 Jun 2006 19:01:17 +1000
    Keith Owens <kaos@ocs.com.au> wrote:

    > Macro arch/i386/kernel/entry.S::BUILD_INTERRUPT generates the code to
    > handle an IPI and call the corresponding smp_<name> C code.
    > BUILD_INTERRUPT does not update the hardirq_count for the interrupted
    > task, that is left to the C code. Some of the C IPI handlers do not
    > call irq_enter(), so they are running in IRQ context but the
    > hardirq_count field does not reflect this. For example,
    > smp_invalidate_interrupt does not set the hardirq count.
    >
    > What is the best fix, change BUILD_INTERRUPT to adjust the hardirq
    > count or audit all the C handlers to ensure that they call irq_enter()?
    >

    The IPI handlers run with IRQs disabled. Do we need a fix?

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