On Thu, 27 Jun 2013 22:30:41 -0700 Randy Dunlap [off-list ref] wrote:

On 06/27/13 16:37, akpm@linux-foundation.org wrote:

quoted

The mm-of-the-moment snapshot 2013-06-27-16-36 has been uploaded to

   http://www.ozlabs.org/~akpm/mmotm/

mmotm-readme.txt says

README for mm-of-the-moment:

http://www.ozlabs.org/~akpm/mmotm/

My builds are littered with hundreds of warnings like this one:

drivers/tty/tty_ioctl.c:220:6: warning: the omitted middle operand in ?: will always be 'true', suggest explicit middle operand [-Wparentheses]

I guess due to this line from wait_event_common():

+		__ret = __wait_no_timeout(tout) ?: (tout) ?: 1;

Ah, sorry, I missed that.  Had I noticed it, I would have spat it back
on taste grounds alone, it being unfit for human consumption.

Something like this?

--- a/include/linux/wait.h~wait-introduce-wait_event_commonwq-condition-state-timeout-fix
+++ a/include/linux/wait.h

@@ -196,7 +196,11 @@ wait_queue_head_t *bit_waitqueue(void *,
 	for (;;) {							\
 		prepare_to_wait(&wq, &__wait, state);			\
 		if (condition) {					\
-			__ret = __wait_no_timeout(tout) ?: __tout ?: 1;	\
+			__ret = __wait_no_timeout(tout);		\
+			if (!__ret)					\
+				__ret = __tout;				\
+				if (!__ret)				\
+					__ret = 1;			\
 			break;						\
 		}							\
 									\