[patch] x86_64: Fix boot hang due to nmi watchdog init code

[Ravikiran G Thirumalai <kiran@scalex86.org>]

2.6.19  stopped booting (or booted based on build/config) on our x86_64
systems due to a bug introduced in 2.6.19.  check_nmi_watchdog schedules an
IPI on all cpus to  busy wait on a flag, but fails to set the busywait
flag if NMI functionality is disabled.  This causes the secondary cpus
to spin in an endless loop, causing the kernel bootup to hang.
Depending upon the build, the  busywait flag got overwritten (stack variable)
and caused  the kernel to bootup on certain builds.  Following patch fixes
the bug by setting the busywait flag before returning from check_nmi_watchdog.
I guess using a stack variable is not good here as the calling function could
potentially return while the busy wait loop is still spinning on the flag.
I would think this is a good candidate for 2.6.19 stable as well.

Signed-off-by: Ravikiran Thirumalai <kiran@scalex86.org>
Signed-off-by: Shai Fultheim <shai@scalex86.org>

Index: linux-2.6.19/arch/x86_64/kernel/nmi.c
===================================================================
--- linux-2.6.19.orig/arch/x86_64/kernel/nmi.c	2006-11-29 13:57:37.000000000 -0800
+++ linux-2.6.19/arch/x86_64/kernel/nmi.c	2006-12-04 18:02:42.462737000 -0800
@@ -210,9 +210,10 @@ static __init void nmi_cpu_busy(void *da
 }
 #endif
 
+static int endflag = 0;
+
 int __init check_nmi_watchdog (void)
 {
-	volatile int endflag = 0;
 	int *counts;
 	int cpu;
 
@@ -253,6 +254,7 @@ int __init check_nmi_watchdog (void)
 	if (!atomic_read(&nmi_active)) {
 		kfree(counts);
 		atomic_set(&nmi_active, -1);
+		endflag = 1;
 		return -1;
 	}
 	endflag = 1;