linux-kernel - WARNING: at drivers/iommu/dmar.c:484 warn_invalid

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Date:	Tue, 9 Jul 2013 13:24:06 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	linux-kernel@...r.kernel.org
Subject: WARNING: at drivers/iommu/dmar.c:484 warn_invalid_dmar with Intel
 Motherboard

I started seeing this problem after updating the BIOS trying fix another issue,
though I may have missed it earlier.

I understand this is a BIOS bug. Would be great if someone can pass this on
to Intel BIOS engineers.

CPU is i7-4770K.

Guenter

---

[    0.000000] WARNING: at drivers/iommu/dmar.c:484 warn_invalid_dmar+0x86/0xa0()
[    0.000000] Your BIOS is broken; DMAR reported at address 0!
[    0.000000] BIOS vendor: Intel Corp.; Ver: RLH8710H.86A.0320.2013.0606.1802; Product Version:
[    0.000000] Modules linked in:
[    0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 3.10.0+ #1
[    0.000000] Hardware name:                  /DH87RL, BIOS RLH8710H.86A.0320.2013.0606.1802 06/06/2013
[    0.000000]  000000000000000b ffffffff81c01e20 ffffffff81671cfc ffffffff81c01e68
[    0.000000]  ffffffff81c01e58 ffffffff81043370 ffffffff81f6800c ffffffff81cbb520
[    0.000000]  0000000000000000 ffff88061fdaad40 00000000c73cc018 ffffffff81c01eb8
[    0.000000] Call Trace:
[    0.000000]  [<ffffffff81671cfc>] dump_stack+0x45/0x56
[    0.000000]  [<ffffffff81043370>] warn_slowpath_common+0x70/0xa0
[    0.000000]  [<ffffffff81043404>] warn_slowpath_fmt_taint+0x44/0x50
[    0.000000]  [<ffffffff81d162eb>] ? early_ioremap+0x13/0x15
[    0.000000]  [<ffffffff81d0d6a6>] ? __acpi_map_table+0x13/0x1a
[    0.000000]  [<ffffffff81548bf6>] warn_invalid_dmar+0x86/0xa0
[    0.000000]  [<ffffffff81d4b994>] check_zero_address+0x57/0xf7
[    0.000000]  [<ffffffff81d4ba49>] detect_intel_iommu+0x15/0xb6
[    0.000000]  [<ffffffff81d07d28>] pci_iommu_alloc+0x49/0x70
[    0.000000]  [<ffffffff81d15de4>] mem_init+0x17/0x9c
[    0.000000]  [<ffffffff81d01c54>] start_kernel+0x1c5/0x3e2
[    0.000000]  [<ffffffff81d01898>] ? repair_env_string+0x5e/0x5e
[    0.000000]  [<ffffffff81d015a3>] x86_64_start_reservations+0x2a/0x2c
[    0.000000]  [<ffffffff81d0169b>] x86_64_start_kernel+0xf6/0xf9
[    0.000000] ---[ end trace a7e3512e2fa85eaf ]---
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