Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/shaggy...

[pandora-kernel.git] / arch / x86_64 / kernel / nmi.c

diff --git a/arch/x86_64/kernel/nmi.c b/arch/x86_64/kernel/nmi.c
index 27e95e7..186aebb 100644 (file)
--- a/arch/x86_64/kernel/nmi.c
+++ b/arch/x86_64/kernel/nmi.c
@@ -193,6 +193,8 @@ void nmi_watchdog_default(void)
                nmi_watchdog = NMI_IO_APIC;
 }
 
+static int endflag __initdata = 0;
+
 #ifdef CONFIG_SMP
 /* The performance counters used by NMI_LOCAL_APIC don't trigger when
  * the CPU is idle. To make sure the NMI watchdog really ticks on all
@@ -200,7 +202,6 @@ void nmi_watchdog_default(void)
  */
 static __init void nmi_cpu_busy(void *data)
 {
-       volatile int *endflag = data;
        local_irq_enable_in_hardirq();
        /* Intentionally don't use cpu_relax here. This is
           to make sure that the performance counter really ticks,
@@ -208,14 +209,13 @@ static __init void nmi_cpu_busy(void *data)
           pause instruction. On a real HT machine this is fine because
           all other CPUs are busy with "useless" delay loops and don't
           care if they get somewhat less cycles. */
-       while (*endflag == 0)
-               barrier();
+       while (endflag == 0)
+               mb();
 }
 #endif
 
 int __init check_nmi_watchdog (void)
 {
-       volatile int endflag = 0;
        int *counts;
        int cpu;
 
@@ -256,6 +256,7 @@ int __init check_nmi_watchdog (void)
        if (!atomic_read(&nmi_active)) {
                kfree(counts);
                atomic_set(&nmi_active, -1);
+               endflag = 1;
                return -1;
        }
        endflag = 1;