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authorAl Viro <viro@parcelfarce.linux.theplanet.co.uk>2005-04-20 17:12:41 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2005-04-20 17:12:41 -0700
commit489ec5f5d59b306e4ccc505eac417526adedb438 (patch)
tree506d4be0182ca0a434c70e1267087646644a0e69 /include/asm-sparc64/spinlock.h
parent4d78b6c78ae6d87e4c1c8072f42efa716f04afb9 (diff)
downloadlinux-489ec5f5d59b306e4ccc505eac417526adedb438.tar.gz
[SPARC64]: sparc64 preempt + smp
PREEMPT+SMP support - see if it looks sane... Signed-off-by: Al Viro <viro@parcelfarce.linux.theplanet.co.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/asm-sparc64/spinlock.h')
-rw-r--r--include/asm-sparc64/spinlock.h48
1 files changed, 31 insertions, 17 deletions
diff --git a/include/asm-sparc64/spinlock.h b/include/asm-sparc64/spinlock.h
index 11efa474865..d1f91a4f24a 100644
--- a/include/asm-sparc64/spinlock.h
+++ b/include/asm-sparc64/spinlock.h
@@ -31,15 +31,20 @@
#ifndef CONFIG_DEBUG_SPINLOCK
-typedef unsigned char spinlock_t;
-#define SPIN_LOCK_UNLOCKED 0
+typedef struct {
+ volatile unsigned char lock;
+#ifdef CONFIG_PREEMPT
+ unsigned int break_lock;
+#endif
+} spinlock_t;
+#define SPIN_LOCK_UNLOCKED (spinlock_t) {0,}
-#define spin_lock_init(lock) (*((unsigned char *)(lock)) = 0)
-#define spin_is_locked(lock) (*((volatile unsigned char *)(lock)) != 0)
+#define spin_lock_init(lp) do { *(lp)= SPIN_LOCK_UNLOCKED; } while(0)
+#define spin_is_locked(lp) ((lp)->lock != 0)
-#define spin_unlock_wait(lock) \
+#define spin_unlock_wait(lp) \
do { membar("#LoadLoad"); \
-} while(*((volatile unsigned char *)lock))
+} while(lp->lock)
static inline void _raw_spin_lock(spinlock_t *lock)
{
@@ -109,20 +114,19 @@ static inline void _raw_spin_lock_flags(spinlock_t *lock, unsigned long flags)
#else /* !(CONFIG_DEBUG_SPINLOCK) */
typedef struct {
- unsigned char lock;
+ volatile unsigned char lock;
unsigned int owner_pc, owner_cpu;
+#ifdef CONFIG_PREEMPT
+ unsigned int break_lock;
+#endif
} spinlock_t;
#define SPIN_LOCK_UNLOCKED (spinlock_t) { 0, 0, 0xff }
-#define spin_lock_init(__lock) \
-do { (__lock)->lock = 0; \
- (__lock)->owner_pc = 0; \
- (__lock)->owner_cpu = 0xff; \
-} while(0)
-#define spin_is_locked(__lock) (*((volatile unsigned char *)(&((__lock)->lock))) != 0)
+#define spin_lock_init(lp) do { *(lp)= SPIN_LOCK_UNLOCKED; } while(0)
+#define spin_is_locked(__lock) ((__lock)->lock != 0)
#define spin_unlock_wait(__lock) \
do { \
membar("#LoadLoad"); \
-} while(*((volatile unsigned char *)(&((__lock)->lock))))
+} while((__lock)->lock)
extern void _do_spin_lock (spinlock_t *lock, char *str);
extern void _do_spin_unlock (spinlock_t *lock);
@@ -139,8 +143,13 @@ extern int _do_spin_trylock (spinlock_t *lock);
#ifndef CONFIG_DEBUG_SPINLOCK
-typedef unsigned int rwlock_t;
-#define RW_LOCK_UNLOCKED 0
+typedef struct {
+ volatile unsigned int lock;
+#ifdef CONFIG_PREEMPT
+ unsigned int break_lock;
+#endif
+} rwlock_t;
+#define RW_LOCK_UNLOCKED {0,}
#define rwlock_init(lp) do { *(lp) = RW_LOCK_UNLOCKED; } while(0)
static void inline __read_lock(rwlock_t *lock)
@@ -251,9 +260,12 @@ static int inline __write_trylock(rwlock_t *lock)
#else /* !(CONFIG_DEBUG_SPINLOCK) */
typedef struct {
- unsigned long lock;
+ volatile unsigned long lock;
unsigned int writer_pc, writer_cpu;
unsigned int reader_pc[NR_CPUS];
+#ifdef CONFIG_PREEMPT
+ unsigned int break_lock;
+#endif
} rwlock_t;
#define RW_LOCK_UNLOCKED (rwlock_t) { 0, 0, 0xff, { } }
#define rwlock_init(lp) do { *(lp) = RW_LOCK_UNLOCKED; } while(0)
@@ -304,6 +316,8 @@ do { unsigned long flags; \
#endif /* CONFIG_DEBUG_SPINLOCK */
#define _raw_read_trylock(lock) generic_raw_read_trylock(lock)
+#define read_can_lock(rw) (!((rw)->lock & 0x80000000UL))
+#define write_can_lock(rw) (!(rw)->lock)
#endif /* !(__ASSEMBLY__) */