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x86, mrst: Conditionally register cpu hotplug notifier for apbt 

APB timer is used on Moorestown platforms but not on a standard PC.
If APB timer code is compiled in but not initialized at run-time due
to lack of FW reported SFI table, kernel would panic when the non-boot
CPUs are offlined and notifier is called.

https://bugzilla.kernel.org/show_bug.cgi?id=15786

This patch ensures CPU hotplug notifier for APB timer is only registered
when the APBT timer block is initialized.

Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
LKML-Reference: <1271701423-1162-1-git-send-email-jacob.jun.pan@linux.intel.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
Jacob Pan 2010-04-19 11:23:43 -07:00 committed by H. Peter Anvin
parent 05ce7bfe54
commit ae7c9b70dc
1 changed files with 1 additions and 1 deletions
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2
arch/x86/kernel/apb_timer.c
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@ -429,7 +429,7 @@ static int apbt_cpuhp_notify(struct notifier_block *n,
static __init int apbt_late_init(void) static __init int apbt_late_init(void)
{ {
if (disable_apbt_percpu) if (disable_apbt_percpu || !apb_timer_block_enabled)
return 0; return 0;
/* This notifier should be called after workqueue is ready */ /* This notifier should be called after workqueue is ready */
hotcpu_notifier(apbt_cpuhp_notify, -20); hotcpu_notifier(apbt_cpuhp_notify, -20);