chushi: kabi: add reserved fields for core structure of message queue

add reserved fields to msg_msg for kernel binary interface compatibility
or emergency bug fix. and initialize them to zero when allocated.

Signed-off-by: Jiaolong He <hejiaolong@kernelsoft.com>

include/linux/msg.h

@@ -12,6 +12,10 @@ struct msg_msg {
 	size_t m_ts;		/* message text size */
 	struct msg_msgseg *next;
 	void *security;
+
+	unsigned long chushi_reserve1;
+	unsigned long chushi_reserve2;
+
 	/* the actual message follows immediately */
 };
 

ipc/msgutil.c

@@ -56,6 +56,8 @@ static struct msg_msg *alloc_msg(size_t len)
 
 	msg->next = NULL;
 	msg->security = NULL;
+	msg->chushi_reserve1 = 0;
+	msg->chushi_reserve2 = 0;
 
 	len -= alen;
 	pseg = &msg->next;