[PATCH] powerpc: export validate_sp for oprofile calltrace

Export validate_sp so we can use it in the oprofile calltrace code.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

2 files changed, 7 insertions, 1 deletions

diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index c6e81bbd615c..706090c99f47 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -770,7 +770,7 @@ out:
         return error;
 }
 
-static int validate_sp(unsigned long sp, struct task_struct *p,
+int validate_sp(unsigned long sp, struct task_struct *p,
                        unsigned long nbytes)
 {
         unsigned long stack_page = (unsigned long)task_stack_page(p);
@@ -808,6 +808,8 @@ static int validate_sp(unsigned long sp, struct task_struct *p,
 #define FRAME_MARKER    2
 #endif
 
+EXPORT_SYMBOL(validate_sp);
+
 unsigned long get_wchan(struct task_struct *p)
 {
         unsigned long ip, sp;
diff --git a/include/asm-powerpc/processor.h b/include/asm-powerpc/processor.h
index a64198fcfd02..57643b5b782f 100644
--- a/include/asm-powerpc/processor.h
+++ b/include/asm-powerpc/processor.h
@@ -251,6 +251,10 @@ static inline unsigned long __pack_fe01(unsigned int fpmode)
 #define cpu_relax()     barrier()
 #endif
 
+/* Check that a certain kernel stack pointer is valid in task_struct p */
+int validate_sp(unsigned long sp, struct task_struct *p,
+                       unsigned long nbytes);
+
 /*
  * Prefetch macros.
  */