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-rw-r--r--ipc/sem.c11
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;