[tip:sched/core] rcuwait: Annotate task_struct with __rcu

[tip-bot for Joel Fernandes (Google)]

Commit-ID:  ea3ce866b568e087737df666c2c035496f54fdcb
Gitweb:     https://git.kernel.org/tip/ea3ce866b568e087737df666c2c035496f54fdcb
Author:     Joel Fernandes (Google) <joel@xxxxxxxxxxxxxxxxx>
AuthorDate: Wed, 20 Mar 2019 20:34:25 -0400
Committer:  Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Wed, 3 Apr 2019 09:51:04 +0200

rcuwait: Annotate task_struct with __rcu

This suppresses sparse error generated due to the recently added
rcu_assign_pointer sparse check.

  percpu-rwsem.c:162:9: sparse: error: incompatible types in comparison expression
  exit.c:316:16: sparse: error: incompatible types in comparison expression

Signed-off-by: Joel Fernandes (Google) <joel@xxxxxxxxxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
[ From an RCU perspective. ]
Reviewed-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxx>
Cc: Josh Triplett <josh@xxxxxxxxxxxxxxxx>
Cc: Lai Jiangshan <jiangshanlai@xxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Luc Van Oostenryck <luc.vanoostenryck@xxxxxxxxx>
Cc: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>
Cc: Mike Galbraith <efault@xxxxxx>
Cc: Morten Rasmussen <morten.rasmussen@xxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: keescook@xxxxxxxxxxxx
Cc: kernel-hardening@xxxxxxxxxxxxxxxxxx
Cc: kernel-team@xxxxxxxxxxx
Link: https://lkml.kernel.org/r/20190321003426.160260-4-joel@xxxxxxxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
 include/linux/rcuwait.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/rcuwait.h b/include/linux/rcuwait.h
index 90bfa3279a01..563290fc194f 100644
--- a/include/linux/rcuwait.h
+++ b/include/linux/rcuwait.h
@@ -18,7 +18,7 @@
  * awoken.
  */
 struct rcuwait {
-	struct task_struct *task;
+	struct task_struct __rcu *task;
 };
 
 #define __RCUWAIT_INITIALIZER(name)		\