Merge tag 'for-linus-3.16-merge-window' of git://git.kernel.org/pub/scm/linux/kernel...

[karo-tx-linux.git] / ipc / sem.c

diff --git a/ipc/sem.c b/ipc/sem.c
index 910c7a3865c8b22f43b969d968b21816181413af..454f6c6020a8d98dccb167e46d3a5225d5f4ce2d 100644 (file)
--- a/ipc/sem.c
+++ b/ipc/sem.c
@@ -1000,6 +1000,17 @@ static int check_qop(struct sem_array *sma, int semnum, struct sem_queue *q,
 {
        struct sembuf *sop = q->blocking;
 
+       /*
+        * Linux always (since 0.99.10) reported a task as sleeping on all
+        * semaphores. This violates SUS, therefore it was changed to the
+        * standard compliant behavior.
+        * Give the administrators a chance to notice that an application
+        * might misbehave because it relies on the Linux behavior.
+        */
+       pr_info_once("semctl(GETNCNT/GETZCNT) is since 3.16 Single Unix Specification compliant.\n"
+                       "The task %s (%d) triggered the difference, watch for misbehavior.\n",
+                       current->comm, task_pid_nr(current));
+
        if (sop->sem_num != semnum)
                return 0;