i386: Use global flag to disable broken local apic timer on AMD CPUs.
The Averatec 2370 and some other Turion laptop BIOS seems to program the
ENABLE_C1E MSR inconsistently between cores. This confuses the lapic
use heuristics because when C1E is enabled anywhere it seems to affect
the complete chip.
Use a global flag instead of a per cpu flag to handle this.
If any CPU has C1E enabled disabled lapic use.
Thanks to Cal Peake for debugging.
Cc: tglx@linutronix.de
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/include/asm-i386/apic.h b/include/asm-i386/apic.h
index 1e8f6f2..4091b33 100644
--- a/include/asm-i386/apic.h
+++ b/include/asm-i386/apic.h
@@ -116,6 +116,8 @@
extern int timer_over_8254;
extern int local_apic_timer_c2_ok;
+extern int local_apic_timer_disabled;
+
#else /* !CONFIG_X86_LOCAL_APIC */
static inline void lapic_shutdown(void) { }