x86/irq: Hide 'HYP:' line in /proc/interrupts when not on Xen/Hyper-V
Hypervisor callback interrupts are only accounted on Xen/Hyper-V. There is no point in having always-zero HYP: line on other hypervisors or bare metal. Print the line only if HYPERVISOR_CALLBACK_VECTOR was allocated. Reported-by: Radim Krčmář <rkrcmar@redhat.com> Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Cc: Andrew Jones <drjones@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1436286373-11908-1-git-send-email-vkuznets@redhat.comSigned-off-by: Ingo Molnar <mingo@kernel.org>
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