powerpc: Implement task_pt_regs() accessor

The task_pt_regs() macro allows access to the pt_regs of a given task.

This macro is not currently defined for the powerpc architecture, but
we need it for some upcoming utrace additions.

Signed-off-by: Srinivasa DS <srinivasa@in.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/include/asm-powerpc/processor.h b/include/asm-powerpc/processor.h
index 061cd17ba83b550ed93a9cb8d12ac9c0bebf8977..101ed87f7d844d832a7d37a41d91739ed8f0aeb1 100644 (file)
--- a/include/asm-powerpc/processor.h
+++ b/include/asm-powerpc/processor.h
@@ -234,6 +234,8 @@ struct thread_struct {
 #define thread_saved_pc(tsk)    \
         ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
 
+#define task_pt_regs(tsk)      ((struct pt_regs *)(tsk)->thread.regs)
+
 unsigned long get_wchan(struct task_struct *p);
 
 #define KSTK_EIP(tsk)  ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)