sigpending(): move compat to native

... and kill set_fs() use
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

kernel/compat.c

@@ -350,29 +350,6 @@ COMPAT_SYSCALL_DEFINE3(setitimer, int, which,
 	return 0;
 }
 
-#ifdef __ARCH_WANT_SYS_SIGPENDING
-
-/*
- * Assumption: old_sigset_t and compat_old_sigset_t are both
- * types that can be passed to put_user()/get_user().
- */
-
-COMPAT_SYSCALL_DEFINE1(sigpending, compat_old_sigset_t __user *, set)
-{
-	old_sigset_t s;
-	long ret;
-	mm_segment_t old_fs = get_fs();
-
-	set_fs(KERNEL_DS);
-	ret = sys_sigpending((old_sigset_t __user *) &s);
-	set_fs(old_fs);
-	if (ret == 0)
-		ret = put_user(s, set);
-	return ret;
-}
-
-#endif
-
 #ifdef __ARCH_WANT_SYS_SIGPROCMASK
 
 /*

kernel/signal.c

@@ -3254,6 +3254,18 @@ SYSCALL_DEFINE1(sigpending, old_sigset_t __user *, set)
 	return sys_rt_sigpending((sigset_t __user *)set, sizeof(old_sigset_t)); 
 }
 
+#ifdef CONFIG_COMPAT
+COMPAT_SYSCALL_DEFINE1(sigpending, compat_old_sigset_t __user *, set32)
+{
+	sigset_t set;
+	int err = do_sigpending(&set, sizeof(old_sigset_t)); 
+	if (err == 0)
+		if (copy_to_user(set32, &set, sizeof(old_sigset_t)))
+			err = -EFAULT;
+	return err;
+}
+#endif
+
 #endif
 
 #ifdef __ARCH_WANT_SYS_SIGPROCMASK