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    SubjectRe: 2.6.21-rc7-mm1 BUG at kernel/sched-clock.c:175 init_sched_clock()
    >  static void ahci_freeze(struct ata_port *ap)
    > {
    > + void __iomem *mmio = ap->host->iomap[AHCI_PCI_BAR];
    > void __iomem *port_mmio = ahci_port_base(ap);
    >
    > /* turn IRQ off */
    > writel(0, port_mmio + PORT_IRQ_MASK);
    > +
    > + /* clear IRQ pending bit */
    > + writel(1 << ap->port_no, mmio + HOST_IRQ_STAT);


    Neither of those two are going to help in all cases. They are PCI writes
    to mmio so they are posted. You don't know they hit the device until a
    read cycle coming back has completed, so you need to read something after
    doing this to be sure.
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