[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>

2 files changed, 14 insertions, 49 deletions

diff --git a/arch/sparc64/kernel/sparc64_ksyms.c b/arch/sparc64/kernel/sparc64_ksyms.c
index 9202d925a9c..0764b933078 100644
--- a/arch/sparc64/kernel/sparc64_ksyms.c
+++ b/arch/sparc64/kernel/sparc64_ksyms.c
@@ -99,17 +99,6 @@ extern int __ashrdi3(int, int);
 extern void dump_thread(struct pt_regs *, struct user *);
 extern int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs);
 
-#if defined(CONFIG_SMP) && defined(CONFIG_DEBUG_SPINLOCK)
-extern void _do_spin_lock (spinlock_t *lock, char *str);
-extern void _do_spin_unlock (spinlock_t *lock);
-extern int _spin_trylock (spinlock_t *lock);
-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);
-#endif
-
 extern unsigned long phys_base;
 extern unsigned long pfn_base;
 
@@ -152,18 +141,6 @@ EXPORT_SYMBOL(_mcount);
 EXPORT_SYMBOL(cpu_online_map);
 EXPORT_SYMBOL(phys_cpu_present_map);
 
-/* Spinlock debugging library, optional. */
-#ifdef CONFIG_DEBUG_SPINLOCK
-EXPORT_SYMBOL(_do_spin_lock);
-EXPORT_SYMBOL(_do_spin_unlock);
-EXPORT_SYMBOL(_spin_trylock);
-EXPORT_SYMBOL(_do_read_lock);
-EXPORT_SYMBOL(_do_read_unlock);
-EXPORT_SYMBOL(_do_write_lock);
-EXPORT_SYMBOL(_do_write_unlock);
-EXPORT_SYMBOL(_do_write_trylock);
-#endif
-
 EXPORT_SYMBOL(smp_call_function);
 #endif /* CONFIG_SMP */
 
diff --git a/arch/sparc64/lib/debuglocks.c b/arch/sparc64/lib/debuglocks.c
index f03344cf784..7f6ccc4114c 100644
--- a/arch/sparc64/lib/debuglocks.c
+++ b/arch/sparc64/lib/debuglocks.c
@@ -12,8 +12,6 @@
 
 #ifdef CONFIG_SMP
 
-#define GET_CALLER(PC) __asm__ __volatile__("mov %%i7, %0" : "=r" (PC))
-
 static inline void show (char *str, spinlock_t *lock, unsigned long caller)
 {
 	int cpu = smp_processor_id();
@@ -51,14 +49,13 @@ static inline void show_write (char *str, rwlock_t *lock, unsigned long caller)
 #undef INIT_STUCK
 #define INIT_STUCK 100000000
 
-void _do_spin_lock(spinlock_t *lock, char *str)
+void _do_spin_lock(spinlock_t *lock, char *str, unsigned long caller)
 {
-	unsigned long caller, val;
+	unsigned long val;
 	int stuck = INIT_STUCK;
 	int cpu = get_cpu();
 	int shown = 0;
 
-	GET_CALLER(caller);
 again:
 	__asm__ __volatile__("ldstub [%1], %0"
 			     : "=r" (val)
@@ -84,12 +81,11 @@ again:
 	put_cpu();
 }
 
-int _do_spin_trylock(spinlock_t *lock)
+int _do_spin_trylock(spinlock_t *lock, unsigned long caller)
 {
-	unsigned long val, caller;
+	unsigned long val;
 	int cpu = get_cpu();
 
-	GET_CALLER(caller);
 	__asm__ __volatile__("ldstub [%1], %0"
 			     : "=r" (val)
 			     : "r" (&(lock->lock))
@@ -118,14 +114,13 @@ void _do_spin_unlock(spinlock_t *lock)
 
 /* Keep INIT_STUCK the same... */
 
-void _do_read_lock (rwlock_t *rw, char *str)
+void _do_read_lock(rwlock_t *rw, char *str, unsigned long caller)
 {
-	unsigned long caller, val;
+	unsigned long val;
 	int stuck = INIT_STUCK;
 	int cpu = get_cpu();
 	int shown = 0;
 
-	GET_CALLER(caller);
 wlock_again:
 	/* Wait for any writer to go away.  */
 	while (((long)(rw->lock)) < 0) {
@@ -157,15 +152,13 @@ wlock_again:
 	put_cpu();
 }
 
-void _do_read_unlock (rwlock_t *rw, char *str)
+void _do_read_unlock(rwlock_t *rw, char *str, unsigned long caller)
 {
-	unsigned long caller, val;
+	unsigned long val;
 	int stuck = INIT_STUCK;
 	int cpu = get_cpu();
 	int shown = 0;
 
-	GET_CALLER(caller);
-
 	/* Drop our identity _first_. */
 	rw->reader_pc[cpu] = 0;
 	current->thread.smp_lock_count--;
@@ -193,14 +186,13 @@ runlock_again:
 	put_cpu();
 }
 
-void _do_write_lock (rwlock_t *rw, char *str)
+void _do_write_lock(rwlock_t *rw, char *str, unsigned long caller)
 {
-	unsigned long caller, val;
+	unsigned long val;
 	int stuck = INIT_STUCK;
 	int cpu = get_cpu();
 	int shown = 0;
 
-	GET_CALLER(caller);
 wlock_again:
 	/* Spin while there is another writer. */
 	while (((long)rw->lock) < 0) {
@@ -278,14 +270,12 @@ wlock_again:
 	put_cpu();
 }
 
-void _do_write_unlock(rwlock_t *rw)
+void _do_write_unlock(rwlock_t *rw, unsigned long caller)
 {
-	unsigned long caller, val;
+	unsigned long val;
 	int stuck = INIT_STUCK;
 	int shown = 0;
 
-	GET_CALLER(caller);
-
 	/* Drop our identity _first_ */
 	rw->writer_pc = 0;
 	rw->writer_cpu = NO_PROC_ID;
@@ -313,13 +303,11 @@ wlock_again:
 	}
 }
 
-int _do_write_trylock (rwlock_t *rw, char *str)
+int _do_write_trylock(rwlock_t *rw, char *str, unsigned long caller)
 {
-	unsigned long caller, val;
+	unsigned long val;
 	int cpu = get_cpu();
 
-	GET_CALLER(caller);
-
 	/* Try to acuire the write bit.  */
 	__asm__ __volatile__(
 "	mov	1, %%g3\n"