linux-kernel - Re: [3.9-rc1 x86] Bug in ioremap code?

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Date:	Tue, 05 Mar 2013 15:46:36 -0800
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	"H. Peter Anvin" <hpa@...ux.intel.com>
CC:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>, bp@...en8.de,
	linux-kernel@...r.kernel.org
Subject: Re: [3.9-rc1 x86] Bug in ioremap code?

Not sure if it's related by 3.9-rc1 gets in to a reboot loop for me.  I
assume it's triple-faulting.  The last line on the console I see is:

[    0.085702] SMP alternatives: lockdep: fixing up alternatives
[    0.086859] smpboot: Booting Node   0, Processors [    0.086859]
smpboot: Booting Node   0, Processors  #1 OK
 #1 OK

I bisected it down to the neighborhood of c47f39e.  After that, I get
some compile errors:

> arch/x86/built-in.o: In function `generic_load_microcode':
> microcode_intel.c:(.text+0x28195): undefined reference to `microcode_sanity_check'
> microcode_intel.c:(.text+0x281ab): undefined reference to `get_matching_microcode'

Turning off CONFIG_MICROCODE:

-CONFIG_MICROCODE=y
-CONFIG_MICROCODE_INTEL=y
-# CONFIG_MICROCODE_AMD is not set
-CONFIG_MICROCODE_OLD_INTERFACE=y
-CONFIG_MICROCODE_INTEL_LIB=y
-CONFIG_MICROCODE_INTEL_EARLY=y
-CONFIG_MICROCODE_EARLY=y
+# CONFIG_MICROCODE is not set

lets it boot again and fixes those compile errors.  This is with this
config:

	http://i-love.sakura.ne.jp/tmp/config-3.9-rc1

running under a kvm guest:

qemu-system-x86_64 -append 'earlyprintk=ttyS0,115200,keep
console=ttyS0,115200 nmi_watchdog=0 root=/dev/sda1 bootmem_debug'
-kernel vmlinuz -usbdevice tablet  -vnc :1 -net user -net
nic,model=e1000  -hda sarge-amd64-runme-1G.img -m 10240 -smp 2

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