From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Mon, 4 Dec 2017 13:11:10 +0100
Subject: sched/swait: include wait.h
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git
Git-commit: 47ea6be5bd64c42e74081189fb6d41498f17870a
Patch-mainline: Queued in subsystem maintainer repository
References: SLE Realtime Extension

kbuild bot reported against an intermediate RT patch that the build
fails with:

>    In file included from include/linux/completion.h:12:0,
>                     from include/linux/rcupdate_wait.h:10,
>                     from kernel/rcu/srcutiny.c:27:
>    kernel/rcu/srcutiny.c: In function 'srcu_drive_gp':
> >> include/linux/swait.h:172:7: error: implicit declaration of function '___wait_is_interruptible'; did you mean '__swait_event_interruptible'?
>       if (___wait_is_interruptible(state) && __int) {  \

That error vanishes a few patches later (in the RT queue) because wait.h
is then pulled in by other means. It does not seem to surface on !RT.
I think that swait should include a header file for a function/macro
(___wait_is_interruptible()) it is using.

Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Mike Galbraith <mgalbraith@suse.de>
---
 include/linux/swait.h |    1 +
 1 file changed, 1 insertion(+)

--- a/include/linux/swait.h
+++ b/include/linux/swait.h
@@ -4,6 +4,7 @@
 #include <linux/list.h>
 #include <linux/stddef.h>
 #include <linux/spinlock.h>
+#include <linux/wait.h>
 #include <asm/current.h>
 
 /*