x86: irq: Get correct available vectors for cpu disable
check_irq_vectors_for_cpu_disable() can overestimate the number of available interrupt vectors, so the check for cpu down succeeds, but the actual cpu removal fails. It iterates from FIRST_EXTERNAL_VECTOR to NR_VECTORS, which is wrong because the systems vectors are not taken into account. Limit the search to first_system_vector instead of NR_VECTORS. The second indicator for vector availability the used_vectors bitmap is not taken into account at all. So system vectors, e.g. IA32_SYSCALL_VECTOR (0x80) and IRQ_MOVE_CLEANUP_VECTOR (0x20), are accounted as available. Add a check for the used_vectors bitmap and do not account vectors which are marked there. [ tglx: Simplified code. Rewrote changelog and code comments. ] Signed-off-by: NYinghai Lu <yinghai@kernel.org> Acked-by: NPrarit Bhargava <prarit@redhat.com> Cc: Seiji Aguchi <seiji.aguchi@hds.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: K. Y. Srinivasan <kys@microsoft.com> Cc: Steven Rostedt (Red Hat) <rostedt@goodmis.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: "Elliott, Robert (Server Storage)" <Elliott@hp.com> Cc: x86@kernel.org Link: http://lkml.kernel.org/r/1400160305-17774-2-git-send-email-prarit@redhat.comSigned-off-by: NThomas Gleixner <tglx@linutronix.de>
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