1 files changed, 3 insertions, 0 deletions

diff --git a/arch/blackfin/include/asm/ptrace.h b/arch/blackfin/include/asm/ptrace.h
index aaa1c6c2bc19..832d7c009a2c 100644
--- a/arch/blackfin/include/asm/ptrace.h
+++ b/arch/blackfin/include/asm/ptrace.h
@@ -113,6 +113,9 @@ extern void user_disable_single_step(struct task_struct *child);
 /* common code demands this function */
 #define ptrace_disable(child) user_disable_single_step(child)
 
+extern int is_user_addr_valid(struct task_struct *child,
+                              unsigned long start, unsigned long len);
+
 /*
  * Get the address of the live pt_regs for the specified task.
  * These are saved onto the top kernel stack when the process