[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 <[e-mail]>
Signed-off-by: Paul Mackerras <[e-mail]>

arch/powerpc/kernel/process.c

···
 	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);
···
 #define REGS_MARKER	0x72656773ul
 #define FRAME_MARKER	2
 #endif
+
+EXPORT_SYMBOL(validate_sp);
 
 unsigned long get_wchan(struct task_struct *p)
 {

include/asm-powerpc/processor.h

···
 #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.
  */