1 files changed, 11 insertions, 1 deletions

diff --git a/include/linux/sched.h b/include/linux/sched.h
index c2182b53dace..0655570c67eb 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -2182,7 +2182,6 @@ extern struct sigqueue *sigqueue_alloc(void);
 extern void sigqueue_free(struct sigqueue *);
 extern int send_sigqueue(struct sigqueue *,  struct task_struct *, int group);
 extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
-extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
 
 static inline void restore_saved_sigmask(void)
 {
@@ -2228,6 +2227,17 @@ static inline int sas_ss_flags(unsigned long sp)
                 : on_sig_stack(sp) ? SS_ONSTACK : 0);
 }
 
+static inline unsigned long sigsp(unsigned long sp, struct ksignal *ksig)
+{
+        if (unlikely((ksig->ka.sa.sa_flags & SA_ONSTACK)) && ! sas_ss_flags(sp))
+#ifdef CONFIG_STACK_GROWSUP
+                return current->sas_ss_sp;
+#else
+                return current->sas_ss_sp + current->sas_ss_size;
+#endif
+        return sp;
+}
+
 /*
  * Routines for handling mm_structs
  */