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    Subject2.6.24-git: kmap_atomic() WARN_ON()
    current mainline triggers:

    WARNING: at /home/tglx/work/kernel/x86/linux-2.6/arch/x86/mm/highmem_32.c:52 kmap_atomic_prot+0xe5/0x19b()
    Modules linked in: ahci(+) sata_sil libata sd_mod scsi_mod raid1 ext3 jbd ehci_hcd ohci_hcd uhci_hcd
    Pid: 0, comm: swapper Not tainted 2.6.24 #173
    [<c0126b60>] warn_on_slowpath+0x41/0x51
    [<c011c5eb>] ? __enqueue_entity+0x9c/0xa4
    [<c011c717>] ? enqueue_entity+0x124/0x13b
    [<c011cedb>] ? enqueue_task_fair+0x41/0x4c
    [<c032ce88>] ? _spin_lock_irqsave+0x14/0x2e
    [<c012e885>] ? lock_timer_base+0x1f/0x3e
    [<c011ad6d>] kmap_atomic_prot+0xe5/0x19b
    [<c011ae37>] kmap_atomic+0x14/0x16
    [<f88ea218>] ata_scsi_rbuf_get+0x1e/0x2c [libata]
    [<f88ea821>] atapi_qc_complete+0x23f/0x289 [libata]
    [<f88e3d00>] __ata_qc_complete+0x8e/0x93 [libata]
    [<f88e3fc7>] ata_qc_complete+0x115/0x128 [libata]
    [<f88e8d47>] ata_qc_complete_multiple+0x86/0xa0 [libata]
    [<f8841a5d>] ahci_interrupt+0x370/0x40d [ahci]
    [<c01512c6>] handle_IRQ_event+0x21/0x48
    [<c01521ca>] handle_edge_irq+0xc9/0x10a
    [<c0152101>] ? handle_edge_irq+0x0/0x10a
    [<c0107518>] do_IRQ+0x8b/0xb7
    [<c01055db>] common_interrupt+0x23/0x28
    [<c032007b>] ? init_chipset_cmd64x+0xb/0x93
    [<c010316e>] ? mwait_idle_with_hints+0x39/0x3d
    [<c0103172>] ? mwait_idle+0x0/0xf
    [<c010317f>] mwait_idle+0xd/0xf
    [<c0103761>] cpu_idle+0xb0/0xe4
    [<c031b509>] rest_init+0x5d/0x5f

    This is not a new problem. It was pointed out some time ago already,
    but now the WARN_ON() finally made it into mainline :)

    The fix is not obvious, as this code seems to be called from various
    call sites.

    Thanks,
    tglx


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