patch-2.4.6 linux/include/asm-mips/spinlock.h

• Lines: 93
• Date: Mon Jul 2 13:56:40 2001
• Orig file: v2.4.5/linux/include/asm-mips/spinlock.h
• Orig date: Sat May 13 08:31:25 2000

diff -u --recursive --new-file v2.4.5/linux/include/asm-mips/spinlock.h linux/include/asm-mips/spinlock.h
@@ -1,5 +1,4 @@
-/* $Id: spinlock.h,v 1.8 2000/01/23 21:15:52 ralf Exp $
- *
+/*
  * This file is subject to the terms and conditions of the GNU General Public
  * License.  See the file "COPYING" in the main directory of this archive
  * for more details.
@@ -22,6 +21,9 @@
 
 #define spin_lock_init(x)	do { (x)->lock = 0; } while(0);
 
+#define spin_is_locked(x)	((x)->lock != 0)
+#define spin_unlock_wait(x)	({ do { barrier(); } while ((x)->lock); })
+
 /*
  * Simple spin lock operations.  There are two variants, one clears IRQ's
  * on the local processor, one does not.
@@ -29,9 +31,6 @@
  * We make no fairness assumptions.  They have a cost.
  */
 
-typedef struct { unsigned long a[100]; } __dummy_lock_t;
-#define __dummy_lock(lock) (*(__dummy_lock_t *)(lock))
-
 static inline void spin_lock(spinlock_t *lock)
 {
 	unsigned int tmp;
@@ -45,8 +44,8 @@
 	"beqz\t%1, 1b\n\t"
 	" sync\n\t"
 	".set\treorder"
-	: "=o" (__dummy_lock(lock)), "=&r" (tmp)
-	: "o" (__dummy_lock(lock))
+	: "=o" (lock->lock), "=&r" (tmp)
+	: "o" (lock->lock)
 	: "memory");
 }
 
@@ -57,8 +56,8 @@
 	"sync\n\t"
 	"sw\t$0, %0\n\t"
 	".set\treorder"	
-	: "=o" (__dummy_lock(lock))
-	: "o" (__dummy_lock(lock))
+	: "=o" (lock->lock)
+	: "o" (lock->lock)
 	: "memory");
 }
 
@@ -92,8 +91,8 @@
 	"beqz\t%1, 1b\n\t"
 	" sync\n\t"
 	".set\treorder"	
-	: "=o" (__dummy_lock(rw)), "=&r" (tmp)
-	: "o" (__dummy_lock(rw))
+	: "=o" (rw->lock), "=&r" (tmp)
+	: "o" (rw->lock)
 	: "memory");
 }
 
@@ -111,8 +110,8 @@
 	"sc\t%1, %0\n\t"
 	"beqz\t%1, 1b\n\t"
 	".set\treorder"	
-	: "=o" (__dummy_lock(rw)), "=&r" (tmp)
-	: "o" (__dummy_lock(rw))
+	: "=o" (rw->lock), "=&r" (tmp)
+	: "o" (rw->lock)
 	: "memory");
 }
 
@@ -129,8 +128,8 @@
 	"beqz\t%1, 1b\n\t"
 	" sync\n\t"
 	".set\treorder"	
-	: "=o" (__dummy_lock(rw)), "=&r" (tmp)
-	: "o" (__dummy_lock(rw))
+	: "=o" (rw->lock), "=&r" (tmp)
+	: "o" (rw->lock)
 	: "memory");
 }
 
@@ -141,8 +140,8 @@
 	"sync\n\t"
 	"sw\t$0, %0\n\t"
 	".set\treorder"	
-	: "=o" (__dummy_lock(rw))
-	: "o" (__dummy_lock(rw))
+	: "=o" (rw->lock)
+	: "o" (rw->lock)
 	: "memory");
 }