x86: print message if nmi_watchdog=2 cannot be enabled

right now if there's no CPU support for nmi_watchdog=2 we'll just
refuse it silently.

print a useful warning.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 3 insertions, 1 deletions

diff --git a/arch/x86/kernel/cpu/perfctr-watchdog.c b/arch/x86/kernel/cpu/perfctr-watchdog.c
index 19a359472ae1..b943e10ad814 100644
--- a/arch/x86/kernel/cpu/perfctr-watchdog.c
+++ b/arch/x86/kernel/cpu/perfctr-watchdog.c
@@ -667,8 +667,10 @@ int lapic_watchdog_init(unsigned nmi_hz)
 {
         if (!wd_ops) {
                 probe_nmi_watchdog();
-                if (!wd_ops)
+                if (!wd_ops) {
+                        printk(KERN_INFO "NMI watchdog: CPU not supported\n");
                         return -1;
+                }
 
                 if (!wd_ops->reserve()) {
                         printk(KERN_ERR