[PATCH] powerpc: reduce oprofile/common.c differences

Rename and slightly modify {request,free}_perfmon_irq in the ppc code.
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/oprofile/common.c

@@ -46,19 +46,12 @@ static void op_handle_interrupt(struct pt_regs *regs)
 
 static int op_powerpc_setup(void)
 {
-#ifdef __powerpc64__
 	int err;
 
 	/* Grab the hardware */
 	err = reserve_pmc_hardware(op_handle_interrupt);
 	if (err)
 		return err;
-#else /* __powerpc64__ */
-	/* Install our interrupt handler into the existing hook.  */
-	if (request_perfmon_irq(&op_handle_interrupt))
-		return -EBUSY;
-	mb();
-#endif /* __powerpc64__ */
 
 	/* Pre-compute the values to stuff in the hardware registers.  */
 	model->reg_setup(ctr, &sys, model->num_counters);
@@ -78,13 +71,7 @@ static int op_powerpc_setup(void)
 
 static void op_powerpc_shutdown(void)
 {
-#ifdef __powerpc64__
 	release_pmc_hardware();
-#else /* __powerpc64__ */
-	mb();
-	/* Remove our interrupt handler. We may be removing this module. */
-	free_perfmon_irq();
-#endif /* __powerpc64__ */
 }
 
 static void op_powerpc_cpu_start(void *dummy)

arch/ppc/kernel/perfmon.c

@@ -61,7 +61,7 @@ void (*perf_irq)(struct pt_regs *) = dummy_perf;
 
 /* Grab the interrupt, if it's free.
  * Returns 0 on success, -1 if the interrupt is taken already */
-int request_perfmon_irq(void (*handler)(struct pt_regs *))
+int reserve_pmc_hardware(void (*handler)(struct pt_regs *))
 {
 	int err = 0;
 
@@ -71,7 +71,7 @@ int request_perfmon_irq(void (*handler)(struct pt_regs *))
 		perf_irq = handler;
 	else {
 		pr_info("perfmon irq already handled by %p\n", perf_irq);
-		err = -1;
+		err = -EBUSY;
 	}
 
 	spin_unlock(&perfmon_lock);
@@ -79,7 +79,7 @@ int request_perfmon_irq(void (*handler)(struct pt_regs *))
 	return err;
 }
 
-void free_perfmon_irq(void)
+void release_pmc_hardware(void)
 {
 	spin_lock(&perfmon_lock);
 
@@ -89,5 +89,5 @@ void free_perfmon_irq(void)
 }
 
 EXPORT_SYMBOL(perf_irq);
-EXPORT_SYMBOL(request_perfmon_irq);
-EXPORT_SYMBOL(free_perfmon_irq);
+EXPORT_SYMBOL(reserve_pmc_hardware);
+EXPORT_SYMBOL(release_pmc_hardware);

include/asm-ppc/perfmon.h

@@ -3,8 +3,8 @@
 
 extern void (*perf_irq)(struct pt_regs *);
 
-int request_perfmon_irq(void (*handler)(struct pt_regs *));
-void free_perfmon_irq(void);
+int reserve_pmc_hardware(void (*handler)(struct pt_regs *));
+void release_pmc_hardware(void);
 
 #ifdef CONFIG_FSL_BOOKE
 void init_pmc_stop(int ctr);