op 13-01-14 19:50, Colin Cross schreef:

On Mon, Jan 13, 2014 at 4:31 AM, Maarten Lankhorst
[off-list ref] wrote:

quoted

The kernel fence implementation doesn't use event queues, but needs
to perform the same wake up. The symbol is not exported, since the
fence implementation is not built as a module.

Signed-off-by: Maarten Lankhorst <redacted>
---
 include/linux/wait.h |    1 +
 kernel/sched/core.c  |    2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/linux/wait.h b/include/linux/wait.h
index eaa00b10abaa..c54e3ef50134 100644
--- a/include/linux/wait.h
+++ b/include/linux/wait.h

@@ -12,6 +12,7 @@
 typedef struct __wait_queue wait_queue_t;
 typedef int (*wait_queue_func_t)(wait_queue_t *wait, unsigned mode, int flags, void *key);
 int default_wake_function(wait_queue_t *wait, unsigned mode, int flags, void *key);
+int try_to_wake_up(struct task_struct *p, unsigned int state, int wake_flags);

 struct __wait_queue {
        unsigned int            flags;

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index a88f4a485c5e..f41d317042dd 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c

@@ -1578,7 +1578,7 @@ static void ttwu_queue(struct task_struct *p, int cpu)
  * Return: %true if @p was woken up, %false if it was already running.
  * or @state didn't match @p's state.
  */
-static int
+int
 try_to_wake_up(struct task_struct *p, unsigned int state, int wake_flags)
 {
        unsigned long flags;

wake_up_state is already available in linux/sched.h, can you use that?

Indeed! Thanks for the catch.

~Maarten