[PARISC] Take into account nullified insn and lock functions for prof…

…iling

export profile_pc() symbol - oprofile needs it when built as a module.

Signed-off-by: Grant Grundler <grundler@parisc-linux.org>

Take into account nullified insn and lock functions for profiling

This is needed at the end of functions; it is typical that the return
branch nullifies the next insn, which is in the next function. This
causes profiling data to show up against the "wrong" function.

We also count lock times against the locker. This is consistent with
other architectures.

Signed-off-by: Randolph Chung <tausq@parisc-linux.org>

Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>

arch/parisc/kernel/time.c

@@ -104,6 +104,24 @@ irqreturn_t timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 	return IRQ_HANDLED;
 }
 
+
+unsigned long profile_pc(struct pt_regs *regs)
+{
+	unsigned long pc = instruction_pointer(regs);
+
+	if (regs->gr[0] & PSW_N)
+		pc -= 4;
+
+#ifdef CONFIG_SMP
+	if (in_lock_functions(pc))
+		pc = regs->gr[2];
+#endif
+
+	return pc;
+}
+EXPORT_SYMBOL(profile_pc);
+
+
 /*** converted from ia64 ***/
 /*
  * Return the number of micro-seconds that elapsed since the last

include/asm-parisc/ptrace.h

@@ -49,7 +49,7 @@ struct pt_regs {
 #define user_mode(regs)			(((regs)->iaoq[0] & 3) ? 1 : 0)
 #define user_space(regs)		(((regs)->iasq[1] != 0) ? 1 : 0)
 #define instruction_pointer(regs)	((regs)->iaoq[0] & ~3)
-#define profile_pc(regs) instruction_pointer(regs)
+unsigned long profile_pc(struct pt_regs *);
 extern void show_regs(struct pt_regs *);
 #endif