From 1b3c872c8342803d0fcd8042e4e007d173191db6 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Wed, 31 May 2017 04:46:17 -0400
Subject: [PATCH] rt_sigtimedwait(): move compat to native

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 include/linux/signal.h |  2 --
 kernel/compat.c        | 32 --------------------------------
 kernel/signal.c        | 36 +++++++++++++++++++++++++++++++++++-
 3 files changed, 35 insertions(+), 35 deletions(-)

diff --git a/include/linux/signal.h b/include/linux/signal.h
index 1f5a16620693..231603ac20a3 100644
--- a/include/linux/signal.h
+++ b/include/linux/signal.h
@@ -246,8 +246,6 @@ extern int do_send_sig_info(int sig, struct siginfo *info,
 				struct task_struct *p, bool group);
 extern int group_send_sig_info(int sig, struct siginfo *info, struct task_struct *p);
 extern int __group_send_sig_info(int, struct siginfo *, struct task_struct *);
-extern int do_sigtimedwait(const sigset_t *, siginfo_t *,
-				const struct timespec *);
 extern int sigprocmask(int, sigset_t *, sigset_t *);
 extern void set_current_blocked(sigset_t *);
 extern void __set_current_blocked(const sigset_t *);
diff --git a/kernel/compat.c b/kernel/compat.c
index 64e772aabdb5..36e6e7c405e3 100644
--- a/kernel/compat.c
+++ b/kernel/compat.c
@@ -866,38 +866,6 @@ sigset_to_compat(compat_sigset_t *compat, const sigset_t *set)
 	}
 }
 
-COMPAT_SYSCALL_DEFINE4(rt_sigtimedwait, compat_sigset_t __user *, uthese,
-		struct compat_siginfo __user *, uinfo,
-		struct compat_timespec __user *, uts, compat_size_t, sigsetsize)
-{
-	compat_sigset_t s32;
-	sigset_t s;
-	struct timespec t;
-	siginfo_t info;
-	long ret;
-
-	if (sigsetsize != sizeof(sigset_t))
-		return -EINVAL;
-
-	if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
-		return -EFAULT;
-	sigset_from_compat(&s, &s32);
-
-	if (uts) {
-		if (compat_get_timespec(&t, uts))
-			return -EFAULT;
-	}
-
-	ret = do_sigtimedwait(&s, &info, uts ? &t : NULL);
-
-	if (ret > 0 && uinfo) {
-		if (copy_siginfo_to_user32(uinfo, &info))
-			ret = -EFAULT;
-	}
-
-	return ret;
-}
-
 #ifdef __ARCH_WANT_COMPAT_SYS_TIME
 
 /* compat_time_t is a 32 bit "long" and needs to get converted. */
diff --git a/kernel/signal.c b/kernel/signal.c
index 6237f492adfc..fe5b3608c31c 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -2768,7 +2768,7 @@ int copy_siginfo_to_user(siginfo_t __user *to, const siginfo_t *from)
  *  @info: if non-null, the signal's siginfo is returned here
  *  @ts: upper bound on process time suspension
  */
-int do_sigtimedwait(const sigset_t *which, siginfo_t *info,
+static int do_sigtimedwait(const sigset_t *which, siginfo_t *info,
 		    const struct timespec *ts)
 {
 	ktime_t *to = NULL, timeout = KTIME_MAX;
@@ -2857,6 +2857,40 @@ SYSCALL_DEFINE4(rt_sigtimedwait, const sigset_t __user *, uthese,
 	return ret;
 }
 
+#ifdef CONFIG_COMPAT
+COMPAT_SYSCALL_DEFINE4(rt_sigtimedwait, compat_sigset_t __user *, uthese,
+		struct compat_siginfo __user *, uinfo,
+		struct compat_timespec __user *, uts, compat_size_t, sigsetsize)
+{
+	compat_sigset_t s32;
+	sigset_t s;
+	struct timespec t;
+	siginfo_t info;
+	long ret;
+
+	if (sigsetsize != sizeof(sigset_t))
+		return -EINVAL;
+
+	if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
+		return -EFAULT;
+	sigset_from_compat(&s, &s32);
+
+	if (uts) {
+		if (compat_get_timespec(&t, uts))
+			return -EFAULT;
+	}
+
+	ret = do_sigtimedwait(&s, &info, uts ? &t : NULL);
+
+	if (ret > 0 && uinfo) {
+		if (copy_siginfo_to_user32(uinfo, &info))
+			ret = -EFAULT;
+	}
+
+	return ret;
+}
+#endif
+
 /**
  *  sys_kill - send a signal to a process
  *  @pid: the PID of the process