unr: remove UNR64_LOCKED

All platforms support 64-bit atomics now.

sys/kern/subr_unit.c

@@ -98,19 +98,6 @@ static struct mtx unitmtx;
 
 MTX_SYSINIT(unit, &unitmtx, "unit# allocation", MTX_DEF);
 
-#ifdef UNR64_LOCKED
-uint64_t
-alloc_unr64(struct unrhdr64 *unr64)
-{
-	uint64_t item;
-
-	mtx_lock(&unitmtx);
-	item = unr64->counter++;
-	mtx_unlock(&unitmtx);
-	return (item);
-}
-#endif
-
 #else /* ...USERLAND */
 
 #include <bitstring.h>

sys/sys/systm.h

@@ -510,10 +510,6 @@ int alloc_unr_specific(struct unrhdr *uh, u_int item);
 int alloc_unrl(struct unrhdr *uh);
 void free_unr(struct unrhdr *uh, u_int item);
 
-#ifndef __LP64__
-#define UNR64_LOCKED
-#endif
-
 struct unrhdr64 {
         uint64_t	counter;
 };
@@ -525,16 +521,12 @@ new_unrhdr64(struct unrhdr64 *unr64, uint64_t low)
 	unr64->counter = low;
 }
 
-#ifdef UNR64_LOCKED
-uint64_t alloc_unr64(struct unrhdr64 *);
-#else
 static __inline uint64_t
 alloc_unr64(struct unrhdr64 *unr64)
 {
 
 	return (atomic_fetchadd_64(&unr64->counter, 1));
 }
-#endif
 
 void	intr_prof_stack_use(struct thread *td, struct trapframe *frame);