From b80dfd0f1d69905ddc5521ed31fdb1c558689fa7 Mon Sep 17 00:00:00 2001
From: "David S. Miller" <davem@davemloft.net>
Date: Sun, 24 Jul 2005 19:35:42 -0700
Subject: [PATCH] --- yaml --- r: 4960 b: refs/heads/master c:
 620de54675e76f1369326bbe1fc75aff88917063 h: refs/heads/master v: v3

---
 [refs]                            |  2 +-
 trunk/include/asm-sparc64/rwsem.h | 48 +++----------------------------
 2 files changed, 5 insertions(+), 45 deletions(-)

diff --git a/[refs] b/[refs]
index 4256c257d07f..ec821ed1539e 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 6593eaed814d50214d6056c683d52ac63153730e
+refs/heads/master: 620de54675e76f1369326bbe1fc75aff88917063
diff --git a/trunk/include/asm-sparc64/rwsem.h b/trunk/include/asm-sparc64/rwsem.h
index a1cc94f95984..4568ee4022df 100644
--- a/trunk/include/asm-sparc64/rwsem.h
+++ b/trunk/include/asm-sparc64/rwsem.h
@@ -46,54 +46,14 @@ extern void __up_read(struct rw_semaphore *sem);
 extern void __up_write(struct rw_semaphore *sem);
 extern void __downgrade_write(struct rw_semaphore *sem);
 
-static __inline__ int rwsem_atomic_update(int delta, struct rw_semaphore *sem)
+static inline int rwsem_atomic_update(int delta, struct rw_semaphore *sem)
 {
-	int tmp = delta;
-
-	__asm__ __volatile__(
-		"1:\tlduw	[%2], %%g1\n\t"
-		"add		%%g1, %1, %%g7\n\t"
-		"cas		[%2], %%g1, %%g7\n\t"
-		"cmp		%%g1, %%g7\n\t"
-		"membar		#StoreLoad | #StoreStore\n\t"
-		"bne,pn		%%icc, 1b\n\t"
-		" nop\n\t"
-		"mov		%%g7, %0\n\t"
-		: "=&r" (tmp)
-		: "0" (tmp), "r" (sem)
-		: "g1", "g7", "memory", "cc");
-
-	return tmp + delta;
-}
-
-#define rwsem_atomic_add rwsem_atomic_update
-
-static __inline__ __u16 rwsem_cmpxchgw(struct rw_semaphore *sem, __u16 __old, __u16 __new)
-{
-	u32 old = (sem->count & 0xffff0000) | (u32) __old;
-	u32 new = (old & 0xffff0000) | (u32) __new;
-	u32 prev;
-
-again:
-	__asm__ __volatile__("cas	[%2], %3, %0\n\t"
-			     "membar	#StoreLoad | #StoreStore"
-			     : "=&r" (prev)
-			     : "0" (new), "r" (sem), "r" (old)
-			     : "memory");
-
-	/* To give the same semantics as x86 cmpxchgw, keep trying
-	 * if only the upper 16-bits changed.
-	 */
-	if (prev != old &&
-	    ((prev & 0xffff) == (old & 0xffff)))
-		goto again;
-
-	return prev & 0xffff;
+	return atomic_add_return(delta, (atomic_t *)(&sem->count));
 }
 
-static __inline__ signed long rwsem_cmpxchg(struct rw_semaphore *sem, signed long old, signed long new)
+static inline void rwsem_atomic_add(int delta, struct rw_semaphore *sem)
 {
-	return cmpxchg(&sem->count,old,new);
+	atomic_add(delta, (atomic_t *)(&sem->count));
 }
 
 #endif /* __KERNEL__ */