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Message-ID: <B4ED8DE8E195E84A872496A085BC07822F22@exchange01.corp.win-professional.com>
Date: Tue, 10 Feb 2009 21:34:22 +0100
From: "Morten P.D. Stevens" <mstevens@...-professional.com>
To: "Yinghai Lu" <yinghai@...nel.org>
Cc: "Ingo Molnar" <mingo@...e.hu>,
"Thomas Gleixner" <tglx@...utronix.de>,
"H. Peter Anvin" <hpa@...or.com>,
"Arjan van de Ven" <arjan@...radead.org>,
<linux-kernel@...r.kernel.org>
Subject: RE: warning in arch/x86/kernel/cpu/mtrr/generic.c:400 with 2.6.29-rc3 on IBM x3400
Hi,
> the line before this? it should tell why BIOS set the mask wrong.
here are the lines before:
[ 0.000000] BIOS EBDA/lowmem at: 0009c400/0009c400
[ 0.000000] Initializing cgroup subsys cpuset
[ 0.000000] Initializing cgroup subsys cpu
[ 0.000000] Linux version 2.6.28.4-ibm (root@...ian) (gcc version
4.3.2 (Debian 4.3.2-1.1) ) #1 SMP Tue Feb 10 16:49:51 CET 2009
[ 0.000000] Command line: root=/dev/sda3 ro quiet
[ 0.000000] KERNEL supported cpus:
[ 0.000000] Intel GenuineIntel
[ 0.000000] AMD AuthenticAMD
[ 0.000000] Centaur CentaurHauls
[ 0.000000] BIOS-provided physical RAM map:
[ 0.000000] BIOS-e820: 0000000000000000 - 000000000009c400 (usable)
[ 0.000000] BIOS-e820: 000000000009c400 - 00000000000a0000
(reserved)
[ 0.000000] BIOS-e820: 00000000000e0000 - 0000000000100000
(reserved)
[ 0.000000] BIOS-e820: 0000000000100000 - 00000000bff60000 (usable)
[ 0.000000] BIOS-e820: 00000000bff60000 - 00000000bff6a000 (ACPI
data)
[ 0.000000] BIOS-e820: 00000000bff6a000 - 00000000bff80000 (ACPI
NVS)
[ 0.000000] BIOS-e820: 00000000bff80000 - 00000000c0000000
(reserved)
[ 0.000000] BIOS-e820: 00000000e0000000 - 00000000f0000000
(reserved)
[ 0.000000] BIOS-e820: 00000000fec00000 - 00000000fec10000
(reserved)
[ 0.000000] BIOS-e820: 00000000fee00000 - 00000000fee01000
(reserved)
[ 0.000000] BIOS-e820: 00000000ff000000 - 0000000100000000
(reserved)
[ 0.000000] BIOS-e820: 0000000100000000 - 0000000140000000 (usable)
[ 0.000000] DMI present.
[ 0.000000] last_pfn = 0x140000 max_arch_pfn = 0x3ffffffff
[ 0.000000] mtrr: BIOS set mask_lo: fcffff80 should be ffffff80,
fixing it up
-----Original Message-----
From: yhlu.kernel@...il.com [mailto:yhlu.kernel@...il.com] On Behalf Of
Yinghai Lu
Sent: Tuesday, February 10, 2009 7:52 PM
To: Morten P.D. Stevens
Cc: Ingo Molnar; Thomas Gleixner; H. Peter Anvin; Arjan van de Ven;
linux-kernel@...r.kernel.org
Subject: Re: warning in arch/x86/kernel/cpu/mtrr/generic.c:400 with
2.6.29-rc3 on IBM x3400
On Tue, Feb 10, 2009 at 8:21 AM, Morten P.D. Stevens
<mstevens@...-professional.com> wrote:
> Hi,
>
>> please try:
>> diff --git a/arch/x86/kernel/cpu/mtrr/generic.c
> b/arch/x86/kernel/cpu/mtrr/generic.c
>> index 0c0a455..7a359ce 100644
>> --- a/arch/x86/kernel/cpu/mtrr/generic.c
>> +++ b/arch/x86/kernel/cpu/mtrr/generic.c
>> @@ -397,7 +397,8 @@ static void generic_get_mtrr(unsigned int reg,
> unsigned long *base,
>> tmp |= ~((1<<(hi - 1)) - 1);
>>
>> if (tmp != mask_lo) {
>> - WARN_ONCE(1, KERN_INFO "mtrr: your BIOS has set
> up an incorrect mask, fixing it up.\n");
>> + printk(KERN_INFO "mtrr: BIOS set mask_lo: %x
> should be %x, fixing it up\n", mask_lo, tmp);
>> + WARN_ONCE(1, KERN_INFO "mtrr: your BIOS has set
> up an incorrect mask.\n");
>> mask_lo = tmp;
>> }
>> }
>
> result:
>
> [ 0.000000] ------------[ cut here ]------------
> [ 0.000000] WARNING: at arch/x86/kernel/cpu/mtrr/generic.c:405
> generic_get_mtrr+0xd0/0x10a()
> [ 0.000000] mtrr: your BIOS has set up an incorrect mask.
> [ 0.000000] Modules linked in:
> [ 0.000000] Pid: 0, comm: swapper Not tainted 2.6.28.4-ibm #1
> [ 0.000000] Call Trace:
> [ 0.000000] [<ffffffff8023acca>] warn_slowpath+0xb4/0xda
> [ 0.000000] [<ffffffff8023b8c6>] vprintk+0x2a4/0x2d1
> [ 0.000000] [<ffffffff80221bea>] default_spin_lock_flags+0x6/0x8
> [ 0.000000] [<ffffffff80451cf9>] printk+0x4e/0x5d
> [ 0.000000] [<ffffffff80453e6a>] _spin_lock_irqsave+0x25/0x2c
> [ 0.000000] [<ffffffff802194c0>] mtrr_wrmsr+0x1b/0x48
> [ 0.000000] [<ffffffff805e5f88>] get_mtrr_state+0x2e5/0x2f1
> [ 0.000000] [<ffffffff8021960e>] generic_get_mtrr+0xd0/0x10a
> [ 0.000000] [<ffffffff805e4e0d>] mtrr_bp_init+0x1f5/0xc39
> [ 0.000000] [<ffffffff805e58e4>]
> mtrr_trim_uncached_memory+0x93/0x374
> [ 0.000000] [<ffffffff805f07c9>] early_iounmap+0x13d/0x19d
> [ 0.000000] [<ffffffff805f07c9>] early_iounmap+0x13d/0x19d
> [ 0.000000] [<ffffffff805da140>] early_idt_handler+0x0/0x71
> [ 0.000000] [<ffffffff805e0d56>] setup_arch+0x407/0x78c
> [ 0.000000] [<ffffffff805f4c81>] cgroup_init_subsys+0x2a/0xd9
> [ 0.000000] [<ffffffff805f4f5e>] cgroup_init_early+0x1a4/0x1b6
> [ 0.000000] [<ffffffff80453f10>] _spin_lock+0x6/0x7
> [ 0.000000] [<ffffffff805da931>] start_kernel+0x7b/0x38b
> [ 0.000000] [<ffffffff805da140>] early_idt_handler+0x0/0x71
> [ 0.000000] [<ffffffff805da3a1>] x86_64_start_kernel+0xe7/0xf4
> [ 0.000000] ---[ end trace 4eaa2a86a8e2da22 ]---
>
the line before this? it should tell why BIOS set the mask wrong.
YH
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