[PATCH] i386: Clean up spin/rwlocks

- Inline spinlock strings into their inline functions
- Convert macros to typesafe inlines
- Replace some leftover __asm__ __volatile__s with asm volatile

Signed-off-by: Andi Kleen <ak@suse.de>

1 files changed, 67 insertions, 64 deletions

diff --git a/include/asm-i386/spinlock.h b/include/asm-i386/spinlock.h
index d1020363c41..324329313af 100644
--- a/include/asm-i386/spinlock.h
+++ b/include/asm-i386/spinlock.h
@@ -4,6 +4,7 @@
 #include <asm/atomic.h>
 #include <asm/rwlock.h>
 #include <asm/page.h>
+#include <asm/processor.h>
 #include <linux/compiler.h>
 
 /*
@@ -17,67 +18,64 @@
  * (the type definitions are in asm/spinlock_types.h)
  */
 
-#define __raw_spin_is_locked(x) \
-		(*(volatile signed char *)(&(x)->slock) <= 0)
-
-#define __raw_spin_lock_string \
-	"\n1:\t" \
-	LOCK_PREFIX " ; decb %0\n\t" \
-	"jns 3f\n" \
-	"2:\t" \
-	"rep;nop\n\t" \
-	"cmpb $0,%0\n\t" \
-	"jle 2b\n\t" \
-	"jmp 1b\n" \
-	"3:\n\t"
-
-/*
- * NOTE: there's an irqs-on section here, which normally would have to be
- * irq-traced, but on CONFIG_TRACE_IRQFLAGS we never use
- * __raw_spin_lock_string_flags().
- */
-#define __raw_spin_lock_string_flags \
-	"\n1:\t" \
-	LOCK_PREFIX " ; decb %0\n\t" \
-	"jns 5f\n" \
-	"2:\t" \
-	"testl $0x200, %1\n\t" \
-	"jz 4f\n\t" \
-	"sti\n" \
-	"3:\t" \
-	"rep;nop\n\t" \
-	"cmpb $0, %0\n\t" \
-	"jle 3b\n\t" \
-	"cli\n\t" \
-	"jmp 1b\n" \
-	"4:\t" \
-	"rep;nop\n\t" \
-	"cmpb $0, %0\n\t" \
-	"jg 1b\n\t" \
-	"jmp 4b\n" \
-	"5:\n\t"
+static inline int __raw_spin_is_locked(raw_spinlock_t *x)
+{
+	return *(volatile signed char *)(&(x)->slock) <= 0;
+}
 
 static inline void __raw_spin_lock(raw_spinlock_t *lock)
 {
-	asm(__raw_spin_lock_string : "+m" (lock->slock) : : "memory");
+	asm volatile("\n1:\t"
+		     LOCK_PREFIX " ; decb %0\n\t"
+		     "jns 3f\n"
+		     "2:\t"
+		     "rep;nop\n\t"
+		     "cmpb $0,%0\n\t"
+		     "jle 2b\n\t"
+		     "jmp 1b\n"
+		     "3:\n\t"
+		     : "+m" (lock->slock) : : "memory");
 }
 
 /*
  * It is easier for the lock validator if interrupts are not re-enabled
  * in the middle of a lock-acquire. This is a performance feature anyway
  * so we turn it off:
+ *
+ * NOTE: there's an irqs-on section here, which normally would have to be
+ * irq-traced, but on CONFIG_TRACE_IRQFLAGS we never use this variant.
  */
 #ifndef CONFIG_PROVE_LOCKING
 static inline void __raw_spin_lock_flags(raw_spinlock_t *lock, unsigned long flags)
 {
-	asm(__raw_spin_lock_string_flags : "+m" (lock->slock) : "r" (flags) : "memory");
+	asm volatile(
+		"\n1:\t"
+		LOCK_PREFIX " ; decb %0\n\t"
+		"jns 5f\n"
+		"2:\t"
+		"testl $0x200, %1\n\t"
+		"jz 4f\n\t"
+		"sti\n"
+		"3:\t"
+		"rep;nop\n\t"
+		"cmpb $0, %0\n\t"
+		"jle 3b\n\t"
+		"cli\n\t"
+		"jmp 1b\n"
+		"4:\t"
+		"rep;nop\n\t"
+		"cmpb $0, %0\n\t"
+		"jg 1b\n\t"
+		"jmp 4b\n"
+		"5:\n\t"
+		: "+m" (lock->slock) : "r" (flags) : "memory");
 }
 #endif
 
 static inline int __raw_spin_trylock(raw_spinlock_t *lock)
 {
 	char oldval;
-	__asm__ __volatile__(
+	asm volatile(
 		"xchgb %b0,%1"
 		:"=q" (oldval), "+m" (lock->slock)
 		:"0" (0) : "memory");
@@ -93,38 +91,29 @@ static inline int __raw_spin_trylock(raw_spinlock_t *lock)
 
 #if !defined(CONFIG_X86_OOSTORE) && !defined(CONFIG_X86_PPRO_FENCE)
 
-#define __raw_spin_unlock_string \
-	"movb $1,%0" \
-		:"+m" (lock->slock) : : "memory"
-
-
 static inline void __raw_spin_unlock(raw_spinlock_t *lock)
 {
-	__asm__ __volatile__(
-		__raw_spin_unlock_string
-	);
+	asm volatile("movb $1,%0" : "+m" (lock->slock) :: "memory");
 }
 
 #else
 
-#define __raw_spin_unlock_string \
-	"xchgb %b0, %1" \
-		:"=q" (oldval), "+m" (lock->slock) \
-		:"0" (oldval) : "memory"
-
 static inline void __raw_spin_unlock(raw_spinlock_t *lock)
 {
 	char oldval = 1;
 
-	__asm__ __volatile__(
-		__raw_spin_unlock_string
-	);
+	asm volatile("xchgb %b0, %1"
+		     : "=q" (oldval), "+m" (lock->slock)
+		     : "0" (oldval) : "memory");
 }
 
 #endif
 
-#define __raw_spin_unlock_wait(lock) \
-	do { while (__raw_spin_is_locked(lock)) cpu_relax(); } while (0)
+static inline void __raw_spin_unlock_wait(raw_spinlock_t *lock)
+{
+	while (__raw_spin_is_locked(lock))
+		cpu_relax();
+}
 
 /*
  * Read-write spinlocks, allowing multiple readers
@@ -151,22 +140,36 @@ static inline void __raw_spin_unlock(raw_spinlock_t *lock)
  * read_can_lock - would read_trylock() succeed?
  * @lock: the rwlock in question.
  */
-#define __raw_read_can_lock(x)		((int)(x)->lock > 0)
+static inline int __raw_read_can_lock(raw_rwlock_t *x)
+{
+	return (int)(x)->lock > 0;
+}
 
 /**
  * write_can_lock - would write_trylock() succeed?
  * @lock: the rwlock in question.
  */
-#define __raw_write_can_lock(x)		((x)->lock == RW_LOCK_BIAS)
+static inline int __raw_write_can_lock(raw_rwlock_t *x)
+{
+	return (x)->lock == RW_LOCK_BIAS;
+}
 
 static inline void __raw_read_lock(raw_rwlock_t *rw)
 {
-	__build_read_lock(rw, "__read_lock_failed");
+	asm volatile(LOCK_PREFIX " subl $1,(%0)\n\t"
+		     "jns 1f\n"
+		     "call __read_lock_failed\n\t"
+		     "1:\n"
+		     ::"a" (rw) : "memory");
 }
 
 static inline void __raw_write_lock(raw_rwlock_t *rw)
 {
-	__build_write_lock(rw, "__write_lock_failed");
+	asm volatile(LOCK_PREFIX " subl $" RW_LOCK_BIAS_STR ",(%0)\n\t"
+		     "jz 1f\n"
+		     "call __write_lock_failed\n\t"
+		     "1:\n"
+		     ::"a" (rw) : "memory");
 }
 
 static inline int __raw_read_trylock(raw_rwlock_t *lock)