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    Subjectkmap_atomic slot collision
    Hi!
    I'm trying to use kmap_atomic from both interrupt and task context.
    My idea was to do local_irq_save and then use KM_IRQ0/KM_IRQ1:
    since I'm disabling interrupts I assumed that this should be safe.
    The relevant code is here:
    https://openib.org/svn/gen2/trunk/src/linux-kernel/infiniband/ulp/sdp/sdp_iocb.c

    However, under stress I see errors from arch/i386/mm/highmem.c:42
    if (!pte_none(*(kmap_pte-idx)))
    BUG();

    Apparently, my routine, running from a task context, races with
    some other kernel code, and so I'm trying to use a slot that was not
    yet unmapped.

    Anyone has an idea on what I could be doing wrong?

    Thanks,
    --
    MST
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