sparc64: Manage NMI watchdog enabling like x86.

Use a per-cpu 'wd_enabled' boolean and a global atomic_t count
of watchdog NMI enabled cpus which is set to '-1' if something
is wrong with the watchdog and it can't be used.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 1 deletions

diff --git a/arch/sparc/oprofile/init.c b/arch/sparc/oprofile/init.c
index d172f86439b1..9ce34fd294c9 100644
--- a/arch/sparc/oprofile/init.c
+++ b/arch/sparc/oprofile/init.c
@@ -57,7 +57,7 @@ static void timer_stop(void)
 
 static int op_nmi_timer_init(struct oprofile_operations *ops)
 {
-        if (!nmi_usable)
+        if (atomic_read(&nmi_active) <= 0)
                 return -ENODEV;
 
         ops->start = timer_start;