The comment just above cpu_stop_signal_done() says it is uncertain that
the input @done is valid, and the works enqueued through the function
stop_one_cpu_nowait() do carry no done, thus we have to check if it is
valid when updating work result.
Signed-off-by: Hillf Danton <dhi...@gmail.com>
---
--- a/kernel/stop_machine.c Thu Feb 7 20:03:10 2013
+++ b/kernel/stop_machine.c Fri Feb 8 11:07:40 2013
@@ -279,7 +279,7 @@ repeat:
preempt_disable();
ret = fn(arg);
- if (ret)
+ if (ret && done != NULL)
done->ret = ret;
/* restore preemption and check it's still balanced */
--
--
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