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Date: Thu, 7 Feb 2008 00:58:42 +0100 (CET)
From: Thomas Gleixner <tglx@linutronix.de>
To: Jeff Garzik <jgarzik@pobox.com>
cc: LKML <linux-kernel@vger.kernel.org>
Subject: 2.6.24-git: kmap_atomic() WARN_ON()
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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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