1 files changed, 11 insertions, 0 deletions

diff --git a/ipc/sem.c b/ipc/sem.c
index 910c7a3865c8..454f6c6020a8 100644
--- 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;