[SPARC64]: Make debugging spinlocks usable again.

When the spinlock routines were moved out of line into
kernel/spinlock.c this made it so that the debugging
spinlocks record lock acquisition program counts in the
kernel/spinlock.c functions not in their callers.
This makes the debugging info kind of useless.

So record the correct caller's program counter and
now this feature is useful once more.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 24 insertions, 16 deletions

diff --git a/include/asm-sparc64/spinlock.h b/include/asm-sparc64/spinlock.h
index 9cb93a5c2b4f..d265bf6570fe 100644
--- a/include/asm-sparc64/spinlock.h
+++ b/include/asm-sparc64/spinlock.h
@@ -132,12 +132,15 @@ do { \
         membar("#LoadLoad"); \
 } while((__lock)->lock)
 
-extern void _do_spin_lock (spinlock_t *lock, char *str);
-extern void _do_spin_unlock (spinlock_t *lock);
-extern int _do_spin_trylock (spinlock_t *lock);
-
-#define _raw_spin_trylock(lp)   _do_spin_trylock(lp)
-#define _raw_spin_lock(lock)    _do_spin_lock(lock, "spin_lock")
+extern void _do_spin_lock(spinlock_t *lock, char *str, unsigned long caller);
+extern void _do_spin_unlock(spinlock_t *lock);
+extern int _do_spin_trylock(spinlock_t *lock, unsigned long caller);
+
+#define _raw_spin_trylock(lp)   \
+        _do_spin_trylock(lp, (unsigned long) __builtin_return_address(0))
+#define _raw_spin_lock(lock)    \
+        _do_spin_lock(lock, "spin_lock", \
+                      (unsigned long) __builtin_return_address(0))
 #define _raw_spin_unlock(lock)  _do_spin_unlock(lock)
 #define _raw_spin_lock_flags(lock, flags) _raw_spin_lock(lock)
 
@@ -279,37 +282,41 @@ typedef struct {
 #define RW_LOCK_UNLOCKED        (rwlock_t) { 0, 0, 0xff, { } }
 #define rwlock_init(lp) do { *(lp) = RW_LOCK_UNLOCKED; } while(0)
 
-extern void _do_read_lock(rwlock_t *rw, char *str);
-extern void _do_read_unlock(rwlock_t *rw, char *str);
-extern void _do_write_lock(rwlock_t *rw, char *str);
-extern void _do_write_unlock(rwlock_t *rw);
-extern int _do_write_trylock(rwlock_t *rw, char *str);
+extern void _do_read_lock(rwlock_t *rw, char *str, unsigned long caller);
+extern void _do_read_unlock(rwlock_t *rw, char *str, unsigned long caller);
+extern void _do_write_lock(rwlock_t *rw, char *str, unsigned long caller);
+extern void _do_write_unlock(rwlock_t *rw, unsigned long caller);
+extern int _do_write_trylock(rwlock_t *rw, char *str, unsigned long caller);
 
 #define _raw_read_lock(lock) \
 do {    unsigned long flags; \
         local_irq_save(flags); \
-        _do_read_lock(lock, "read_lock"); \
+        _do_read_lock(lock, "read_lock", \
+                      (unsigned long) __builtin_return_address(0)); \
         local_irq_restore(flags); \
 } while(0)
 
 #define _raw_read_unlock(lock) \
 do {    unsigned long flags; \
         local_irq_save(flags); \
-        _do_read_unlock(lock, "read_unlock"); \
+        _do_read_unlock(lock, "read_unlock", \
+                      (unsigned long) __builtin_return_address(0)); \
         local_irq_restore(flags); \
 } while(0)
 
 #define _raw_write_lock(lock) \
 do {    unsigned long flags; \
         local_irq_save(flags); \
-        _do_write_lock(lock, "write_lock"); \
+        _do_write_lock(lock, "write_lock", \
+                      (unsigned long) __builtin_return_address(0)); \
         local_irq_restore(flags); \
 } while(0)
 
 #define _raw_write_unlock(lock) \
 do {    unsigned long flags; \
         local_irq_save(flags); \
-        _do_write_unlock(lock); \
+        _do_write_unlock(lock, \
+                      (unsigned long) __builtin_return_address(0)); \
         local_irq_restore(flags); \
 } while(0)
 
@@ -317,7 +324,8 @@ do {	unsigned long flags; \
 ({      unsigned long flags; \
         int val; \
         local_irq_save(flags); \
-        val = _do_write_trylock(lock, "write_trylock"); \
+        val = _do_write_trylock(lock, "write_trylock", \
+                                (unsigned long) __builtin_return_address(0)); \
         local_irq_restore(flags); \
         val; \
 })