[tip:sched/core] sched/wait: Include <linux/wait.h> in <linux/swait.h>

[tip-bot for Sebastian Andrzej Siewior]

Commit-ID:  a59a68fee05d46cccc4279ab6609421f7270398e
Gitweb:     https://git.kernel.org/tip/a59a68fee05d46cccc4279ab6609421f7270398e
Author:     Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
AuthorDate: Fri, 4 May 2018 12:42:24 +0200
Committer:  Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Mon, 14 May 2018 09:12:25 +0200

sched/wait: Include <linux/wait.h> in <linux/swait.h>

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@xxxxxxxxx>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Mike Galbraith <efault@xxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: linux-kernel@xxxxxxxxxxxxxxx
Link: http://lkml.kernel.org/r/20180504104224.20218-1-bigeasy@xxxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
 include/linux/swait.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/swait.h b/include/linux/swait.h
index c98aaf677466..84f9745365ff 100644
--- a/include/linux/swait.h
+++ b/include/linux/swait.h
@@ -5,6 +5,7 @@
 #include <linux/list.h>
 #include <linux/stddef.h>
 #include <linux/spinlock.h>
+#include <linux/wait.h>
 #include <asm/current.h>
 
 /*