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

From: Geert Uytterhoeven
Date: Fri May 05 2017 - 05:49:28 EST

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"

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?

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))

* Remove signals in mask from the pending set and queue.