x86, ticketlock: Make __ticket_spin_trylock common
Make trylock code common regardless of ticket size. (Also, rename arch_spinlock.slock to head_tail.) Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Link: http://lkml.kernel.org/r/4E5BCC40.3030501@goop.org Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
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