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From: "Rafael J. Wysocki" <rjw@sisk.pl>
To: Dmitry Nezhevenko <dion@inhex.net>
Subject: Re: 2.6.28 git: WARNING: at arch/x86/kernel/cpu/mtrr/generic.c:404 generic_get_mtrr+0xea/0x120()
Date: Sat, 22 Nov 2008 21:44:31 +0100
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Cc: linux-kernel@vger.kernel.org, Ingo Molnar <mingo@elte.hu>,
       Yinghai Lu <yinghai@kernel.org>,
       Venki Pallipadi <venkatesh.pallipadi@intel.com>
References: <20081120092239.GA16613@laptop.local>
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On Thursday, 20 of November 2008, Dmitry Nezhevenko wrote:
> Hi folks. This is first time I've tried 2.6.28-git (cloned git a few hours ago). 
> And got this:
> 
> [    0.000000] BIOS-provided physical RAM map:
> [    0.000000]  BIOS-e820: 0000000000000000 - 000000000009fc00 (usable)
> [    0.000000]  BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved)
> [    0.000000]  BIOS-e820: 00000000000e0000 - 0000000000100000 (reserved)
> [    0.000000]  BIOS-e820: 0000000000100000 - 000000007ffd0000 (usable)
> [    0.000000]  BIOS-e820: 000000007ffd0000 - 000000007ffde000 (ACPI data)
> [    0.000000]  BIOS-e820: 000000007ffde000 - 0000000080000000 (ACPI NVS)
> [    0.000000]  BIOS-e820: 00000000fec00000 - 00000000fec01000 (reserved)
> [    0.000000]  BIOS-e820: 00000000fee00000 - 00000000fef00000 (reserved)
> [    0.000000]  BIOS-e820: 00000000fff80000 - 0000000100000000 (reserved)
> [    0.000000] DMI present.
> [    0.000000] AMI BIOS detected: BIOS may corrupt low RAM, working it around.
> [    0.000000] last_pfn = 0x7ffd0 max_arch_pfn = 0x100000
> [    0.000000] x86 PAT enabled: cpu 0, old 0x7040600070406, new 0x7010600070106
> [    0.000000] ------------[ cut here ]------------
> [    0.000000] WARNING: at arch/x86/kernel/cpu/mtrr/generic.c:404 generic_get_mtrr+0xea/0x120()
> [    0.000000] mtrr: your BIOS has set up an incorrect mask, fixing it up.
> [    0.000000] Modules linked in:
> [    0.000000] Pid: 0, comm: swapper Not tainted 2.6.28-rc5 #1
> [    0.000000] Call Trace:
> [    0.000000]  [<c012b86f>] warn_slowpath+0x6f/0x90
> [    0.000000]  [<c0373031>] inet_rtm_newroute+0x21/0x50
> [    0.000000]  [<c02593c4>] number+0x2b4/0x2c0
> [    0.000000]  [<c0259ff3>] vsnprintf+0x393/0x670
> [    0.000000]  [<c0144fd1>] up+0x11/0x40
> [    0.000000]  [<c012c069>] release_console_sem+0x189/0x1d0
> [    0.000000]  [<c01124da>] generic_get_mtrr+0xea/0x120
> [    0.000000]  [<c04db85f>] mtrr_trim_uncached_memory+0x7d/0x374
> [    0.000000]  [<c03a569a>] printk+0x17/0x1b
> [    0.000000]  [<c011edbc>] pat_init+0x7c/0xa0
> [    0.000000]  [<c01129ac>] post_set+0x1c/0x50
> [    0.000000]  [<c03a569a>] printk+0x17/0x1b
> [    0.000000]  [<c04d7b52>] e820_end_pfn+0xb5/0xd3
> [    0.000000]  [<c04d6016>] setup_arch+0x518/0x802
> [    0.000000]  [<c04d8cc7>] reserve_early_overlap_ok+0x3f/0x47
> [    0.000000]  [<c04cf5dc>] start_kernel+0x58/0x334
> [    0.000000] ---[ end trace 4eaa2a86a8e2da22 ]---
> [    0.000000] kernel direct mapping tables up to 377fe000 @ 10000-16000
> 
> Can I just ignore this?

Hm, not sure (added some CCs).