scm: remove use CMSG{_COMPAT}_ALIGN(sizeof(struct {compat_}cmsghdr))

sizeof(struct cmsghdr) and sizeof(struct compat_cmsghdr) already aligned.
remove use CMSG_ALIGN(sizeof(struct cmsghdr)) and
CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) keep code consistent.

Signed-off-by: yuan linyu <Linyu.Yuan@alcatel-sbell.com.cn>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/socket.h

@@ -92,9 +92,9 @@ struct cmsghdr {
 
 #define CMSG_ALIGN(len) ( ((len)+sizeof(long)-1) & ~(sizeof(long)-1) )
 
-#define CMSG_DATA(cmsg)	((void *)((char *)(cmsg) + CMSG_ALIGN(sizeof(struct cmsghdr))))
-#define CMSG_SPACE(len) (CMSG_ALIGN(sizeof(struct cmsghdr)) + CMSG_ALIGN(len))
-#define CMSG_LEN(len) (CMSG_ALIGN(sizeof(struct cmsghdr)) + (len))
+#define CMSG_DATA(cmsg)	((void *)((char *)(cmsg) + sizeof(struct cmsghdr)))
+#define CMSG_SPACE(len) (sizeof(struct cmsghdr) + CMSG_ALIGN(len))
+#define CMSG_LEN(len) (sizeof(struct cmsghdr) + (len))
 
 #define __CMSG_FIRSTHDR(ctl,len) ((len) >= sizeof(struct cmsghdr) ? \
 				  (struct cmsghdr *)(ctl) : \

net/compat.c

@@ -90,11 +90,11 @@ int get_compat_msghdr(struct msghdr *kmsg,
 #define CMSG_COMPAT_ALIGN(len)	ALIGN((len), sizeof(s32))
 
 #define CMSG_COMPAT_DATA(cmsg)				\
-	((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr))))
+	((void __user *)((char __user *)(cmsg) + sizeof(struct compat_cmsghdr)))
 #define CMSG_COMPAT_SPACE(len)				\
-	(CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len))
+	(sizeof(struct compat_cmsghdr) + CMSG_COMPAT_ALIGN(len))
 #define CMSG_COMPAT_LEN(len)				\
-	(CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len))
+	(sizeof(struct compat_cmsghdr) + (len))
 
 #define CMSG_COMPAT_FIRSTHDR(msg)			\
 	(((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ?	\
@@ -141,8 +141,7 @@ int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
 		if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
 			return -EINVAL;
 
-		tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
-		       CMSG_ALIGN(sizeof(struct cmsghdr)));
+		tmp = ((ucmlen - sizeof(*ucmsg)) + sizeof(struct cmsghdr));
 		tmp = CMSG_ALIGN(tmp);
 		kcmlen += tmp;
 		ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
@@ -168,8 +167,7 @@ int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
 			goto Efault;
 		if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
 			goto Einval;
-		tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
-		       CMSG_ALIGN(sizeof(struct cmsghdr)));
+		tmp = ((ucmlen - sizeof(*ucmsg)) + sizeof(struct cmsghdr));
 		if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))
 			goto Einval;
 		kcmsg->cmsg_len = tmp;
@@ -178,7 +176,7 @@ int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
 		    __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) ||
 		    copy_from_user(CMSG_DATA(kcmsg),
 				   CMSG_COMPAT_DATA(ucmsg),
-				   (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg)))))
+				   (ucmlen - sizeof(*ucmsg))))
 			goto Efault;
 
 		/* Advance. */

net/core/scm.c

@@ -71,7 +71,7 @@ static int scm_fp_copy(struct cmsghdr *cmsg, struct scm_fp_list **fplp)
 	struct file **fpp;
 	int i, num;
 
-	num = (cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr)))/sizeof(int);
+	num = (cmsg->cmsg_len - sizeof(struct cmsghdr))/sizeof(int);
 
 	if (num <= 0)
 		return 0;

net/ipv4/ip_sockglue.c

@@ -272,7 +272,7 @@ int ip_cmsg_send(struct sock *sk, struct msghdr *msg, struct ipcm_cookie *ipc,
 			continue;
 		switch (cmsg->cmsg_type) {
 		case IP_RETOPTS:
-			err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
+			err = cmsg->cmsg_len - sizeof(struct cmsghdr);
 
 			/* Our caller is responsible for freeing ipc->opt */
 			err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg),

net/rxrpc/sendmsg.c

@@ -376,7 +376,7 @@ static int rxrpc_sendmsg_cmsg(struct msghdr *msg,
 		if (!CMSG_OK(msg, cmsg))
 			return -EINVAL;
 
-		len = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
+		len = cmsg->cmsg_len - sizeof(struct cmsghdr);
 		_debug("CMSG %d, %d, %d",
 		       cmsg->cmsg_level, cmsg->cmsg_type, len);