Ingo Molnar e412cd257e x86, mce: Don't initialize MCEs on unknown CPUs ... An older test-box started hanging at the following point during bootup: [ 0.022996] Mount-cache hash table entries: 512 [ 0.024996] Initializing cgroup subsys debug [ 0.025996] Initializing cgroup subsys cpuacct [ 0.026995] Initializing cgroup subsys devices [ 0.027995] Initializing cgroup subsys freezer [ 0.028995] mce: CPU supports 5 MCE banks I've bisected it down to commit 4efc0670 ("x86, mce: use 64bit machine check code on 32bit"), which utilizes the MCE code on 32-bit systems too. The problem is caused by this detail in my config: # CONFIG_CPU_SUP_INTEL is not set This disables the quirks in mce_cpu_quirks() but still enables MCE support - which then hangs due to the missing quirk workaround needed on this CPU: if (c->x86 == 6 && c->x86_model < 0x1A && banks > 0) mce_banks[0].init = 0; The safe solution is to not initialize MCEs if we dont know on what CPU we are running (or if that CPU's support code got disabled in the config). Also be a bit more defensive on 32-bit systems: dont do a boot-time dump of pending MCEs not just on the specific system that we found a problem with (Pentium-M), but earlier ones as well. Now this problem is probably not common and disabling CPU support is rare - but still being more defensive in something we turned on for a wide range of CPUs is prudent. Cc: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com> LKML-Reference: Message-ID: <4A88E3E4.40506@jp.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>		2009-08-17 13:28:25 +02:00
..
Makefile	x86, mce: rename _64.c files which are no longer 64-bit-specific	2009-06-16 16:56:11 -07:00
k7.c	x86, mce: unify mce.h	2009-06-16 16:56:07 -07:00
mce-inject.c	x86, mce: rename mce_notify_user to mce_notify_irq	2009-06-03 14:48:04 -07:00
mce-internal.h	x86, mce: implement new status bits	2009-06-03 14:45:34 -07:00
mce-severity.c	x86, mce: export MCE severities coverage via debugfs	2009-06-03 14:45:34 -07:00
mce.c	x86, mce: Don't initialize MCEs on unknown CPUs	2009-08-17 13:28:25 +02:00
mce_amd.c	x86, mce: rename _64.c files which are no longer 64-bit-specific	2009-06-16 16:56:11 -07:00
mce_intel.c	x86, mce: mce_intel.c needs <asm/apic.h>	2009-06-17 08:31:15 -07:00
non-fatal.c	x86, mce: unify mce.h	2009-06-16 16:56:07 -07:00
p4.c	x86, mce: remove therm_throt.h	2009-06-16 16:56:09 -07:00
p5.c	x86, mce: make mce_disabled boolean	2009-06-16 16:56:07 -07:00
p6.c	x86, mce: unify mce.h	2009-06-16 16:56:07 -07:00
therm_throt.c	x86, mce: therm_throt: Don't log redundant normality	2009-08-16 17:25:41 +02:00
threshold.c	x86, mce: enable MCE_INTEL for 32bit new MCE	2009-05-28 09:24:13 -07:00
winchip.c	x86, mce: unify mce.h	2009-06-16 16:56:07 -07:00