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