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Whenever we see that a CPU is capable of C3 (during ACPI cstate init), we disable local APIC timer and switch to using a broadcast from external timer interrupt (IRQ 0). Patch below adds the code for x86_64. Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>