diff options
| -rw-r--r-- | ipc/msg.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/ipc/msg.c b/ipc/msg.c index 6d33e30c7c39..c5d8e3749985 100644 --- a/ipc/msg.c +++ b/ipc/msg.c @@ -42,9 +42,7 @@ #include <linux/uaccess.h> #include "util.h" -/* - * one msg_receiver structure for each sleeping receiver: - */ +/* one msg_receiver structure for each sleeping receiver */ struct msg_receiver { struct list_head r_list; struct task_struct *r_tsk; @@ -53,6 +51,12 @@ struct msg_receiver { long r_msgtype; long r_maxsize; + /* + * Mark r_msg volatile so that the compiler + * does not try to get smart and optimize + * it. We rely on this for the lockless + * receive algorithm. + */ struct msg_msg *volatile r_msg; }; |