linux-kernel - Re: warning in arch/x86/kernel/cpu/mtrr/generic.c:400 with 2.6.29-rc3 on IBM x3400

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Date:	Tue, 10 Feb 2009 10:52:23 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	"Morten P.D. Stevens" <mstevens@...-professional.com>
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

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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