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    Subject[PATCH 2.6.25.10 1/2] libata: fix locking for kmap_atomic
    Date
    Change locking surrounding kmap_atomic from local_irqsave to 
    local_irqsave_nort. This fixes issues with PREEMPT_RT.

    Signed-off-by: Jakub Jozwicki <jozwicki@aster.pl>

    --- linux-2.6.25.10/drivers/ata/libata-core.c 2008-07-03 05:46:47.000000000
    +0200
    +++ linux-2.6.25.10-rt7/drivers/ata/libata-core.c 2008-07-12
    23:59:33.132140258 +0200
    @@ -5157,14 +5157,14 @@
    unsigned long flags;

    /* FIXME: use a bounce buffer */
    - local_irq_save(flags);
    + local_irq_save_nort(flags);
    buf = kmap_atomic(page, KM_IRQ0);

    /* do the actual data transfer */
    ap->ops->data_xfer(qc->dev, buf + offset, qc->sect_size, do_write);

    kunmap_atomic(buf, KM_IRQ0);
    - local_irq_restore(flags);
    + local_irq_restore_nort(flags);
    } else {
    buf = page_address(page);
    ap->ops->data_xfer(qc->dev, buf + offset, qc->sect_size, do_write);
    @@ -5294,14 +5294,14 @@
    unsigned long flags;

    /* FIXME: use bounce buffer */
    - local_irq_save(flags);
    + local_irq_save_nort(flags);
    buf = kmap_atomic(page, KM_IRQ0);

    /* do the actual data transfer */
    consumed = ap->ops->data_xfer(dev, buf + offset, count, rw);

    kunmap_atomic(buf, KM_IRQ0);
    - local_irq_restore(flags);
    + local_irq_restore_nort(flags);
    } else {
    buf = page_address(page);
    consumed = ap->ops->data_xfer(dev, buf + offset, count, rw);

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