[MIPS] Terminally fix local_{dec,sub}_if_positive

They contain 64-bit instructions so wouldn't work on 32-bit kernels or
32-bit hardware.  Since there are no users, blow them away.  They
probably were only ever created because there are atomic_sub_if_positive
and atomic_dec_if_positive which exist only for sake of semaphores.
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

include/asm-mips/local.h

@@ -115,68 +115,6 @@ static __inline__ long local_sub_return(long i, local_t * l)
 	return result;
 }
 
-/*
- * local_sub_if_positive - conditionally subtract integer from atomic variable
- * @i: integer value to subtract
- * @l: pointer of type local_t
- *
- * Atomically test @l and subtract @i if @l is greater or equal than @i.
- * The function returns the old value of @l minus @i.
- */
-static __inline__ long local_sub_if_positive(long i, local_t * l)
-{
-	unsigned long result;
-
-	if (cpu_has_llsc && R10000_LLSC_WAR) {
-		unsigned long temp;
-
-		__asm__ __volatile__(
-		"	.set	mips3					\n"
-		"1:"	__LL	"%1, %2		# local_sub_if_positive\n"
-		"	dsubu	%0, %1, %3				\n"
-		"	bltz	%0, 1f					\n"
-			__SC	"%0, %2					\n"
-		"	.set	noreorder				\n"
-		"	beqzl	%0, 1b					\n"
-		"	 dsubu	%0, %1, %3				\n"
-		"	.set	reorder					\n"
-		"1:							\n"
-		"	.set	mips0					\n"
-		: "=&r" (result), "=&r" (temp), "=m" (l->a.counter)
-		: "Ir" (i), "m" (l->a.counter)
-		: "memory");
-	} else if (cpu_has_llsc) {
-		unsigned long temp;
-
-		__asm__ __volatile__(
-		"	.set	mips3					\n"
-		"1:"	__LL	"%1, %2		# local_sub_if_positive\n"
-		"	dsubu	%0, %1, %3				\n"
-		"	bltz	%0, 1f					\n"
-			__SC	"%0, %2					\n"
-		"	.set	noreorder				\n"
-		"	beqz	%0, 1b					\n"
-		"	 dsubu	%0, %1, %3				\n"
-		"	.set	reorder					\n"
-		"1:							\n"
-		"	.set	mips0					\n"
-		: "=&r" (result), "=&r" (temp), "=m" (l->a.counter)
-		: "Ir" (i), "m" (l->a.counter)
-		: "memory");
-	} else {
-		unsigned long flags;
-
-		local_irq_save(flags);
-		result = l->a.counter;
-		result -= i;
-		if (result >= 0)
-			l->a.counter = result;
-		local_irq_restore(flags);
-	}
-
-	return result;
-}
-
 #define local_cmpxchg(l, o, n) \
 	((long)cmpxchg_local(&((l)->a.counter), (o), (n)))
 #define local_xchg(l, n) (xchg_local(&((l)->a.counter),(n)))
@@ -234,12 +172,6 @@ static __inline__ long local_sub_if_positive(long i, local_t * l)
  */
 #define local_dec_and_test(l) (local_sub_return(1, (l)) == 0)
 
-/*
- * local_dec_if_positive - decrement by 1 if old value positive
- * @l: pointer of type local_t
- */
-#define local_dec_if_positive(l)	local_sub_if_positive(1, l)
-
 /*
  * local_add_negative - add and test if negative
  * @l: pointer of type local_t