i386: Fix the K7 NMI watchdog checkbit

The performance counters on K7 are only 48 bits wide, so using bit 63 to
check if the counter overflowed is wrong. Let's use bit 47 instead.

Signed-off-by: Björn Steinbrink <B.Steinbrink@gmx.de>
Cc: Don Zickus <dzickus@redhat.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/i386/kernel/cpu/perfctr-watchdog.c b/arch/i386/kernel/cpu/perfctr-watchdog.c
index 572900398def0a7bcda281aa572ebe2cb6f05cc2..4be488e73bee11760f9de2b9c8b8acd65e556a38 100644 (file)
--- a/arch/i386/kernel/cpu/perfctr-watchdog.c
+++ b/arch/i386/kernel/cpu/perfctr-watchdog.c
@@ -325,7 +325,7 @@ static struct wd_ops k7_wd_ops = {
        .stop = single_msr_stop_watchdog,
        .perfctr = MSR_K7_PERFCTR0,
        .evntsel = MSR_K7_EVNTSEL0,
-       .checkbit = 1ULL<<63,
+       .checkbit = 1ULL<<47,
 };
 
 /* Intel Model 6 (PPro+,P2,P3,P-M,Core1) */