[PATCH/RFC] signal: Export signal_wake_up_state() to modules

[Geert Uytterhoeven <geert+renesas@xxxxxxxxx>]

When using signal_wake_up() from a loadable kernel module:

    ERROR: "signal_wake_up_state" [drivers/spi/spi-sh-msiof.ko] undefined!

Export signal_wake_up_state() to modules to fix this.

Reported-by: kbuild test robot <fengguang.wu@xxxxxxxxx>
Signed-off-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
---
I'm using signal_wake_up() to abort a task blocked on
wait_for_completion_interruptible(), cfr. sh_msiof_slave_abort() in
"spi: sh-msiof: Add slave mode support"
(http://www.spinics.net/lists/devicetree/msg175575.html).

Is exporting signal_wake_up_state() an acceptable solution?
Alternatively, I can extract the code to abort an completion into a
generic abort_completion() function, and export that.

Or is there a better way to abort a completion?

Thanks!
---
 kernel/signal.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/signal.c b/kernel/signal.c
index 7e59ebc2c25e669e..f130598acd34f08b 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -660,6 +660,7 @@ void signal_wake_up_state(struct task_struct *t, unsigned int state)
 	if (!wake_up_state(t, state | TASK_INTERRUPTIBLE))
 		kick_process(t);
 }
+EXPORT_SYMBOL_GPL(signal_wake_up_state);
 
 /*
  * Remove signals in mask from the pending set and queue.
-- 
2.7.4

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