diff --git a/kernel/signal.c b/kernel/signal.c
index 985c61749bcf2cad41d0d9a7f10773e32f0d8ebb..f0446665523894b82fe6720fecb041d1bcc6e039 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -3573,9 +3573,8 @@ int __save_altstack(stack_t __user *uss, unsigned long sp)
 }
 
 #ifdef CONFIG_COMPAT
-COMPAT_SYSCALL_DEFINE2(sigaltstack,
-			const compat_stack_t __user *, uss_ptr,
-			compat_stack_t __user *, uoss_ptr)
+static int do_compat_sigaltstack(const compat_stack_t __user *uss_ptr,
+				 compat_stack_t __user *uoss_ptr)
 {
 	stack_t uss, uoss;
 	int ret;
@@ -3602,9 +3601,16 @@ COMPAT_SYSCALL_DEFINE2(sigaltstack,
 	return ret;
 }
 
+COMPAT_SYSCALL_DEFINE2(sigaltstack,
+			const compat_stack_t __user *, uss_ptr,
+			compat_stack_t __user *, uoss_ptr)
+{
+	return do_compat_sigaltstack(uss_ptr, uoss_ptr);
+}
+
 int compat_restore_altstack(const compat_stack_t __user *uss)
 {
-	int err = compat_sys_sigaltstack(uss, NULL);
+	int err = do_compat_sigaltstack(uss, NULL);
 	/* squash all but -EFAULT for now */
 	return err == -EFAULT ? err : 0;
 }