ext4: fix miscellaneous big endian warnings

None of these result in any bug, but they makes sparse complain.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

fs/ext4/namei.c

@@ -416,15 +416,16 @@ static __le32 ext4_dx_csum(struct inode *inode, struct ext4_dir_entry *dirent,
 {
 	struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
 	struct ext4_inode_info *ei = EXT4_I(inode);
-	__u32 csum, old_csum;
+	__u32 csum;
+	__le32 save_csum;
 	int size;
 
 	size = count_offset + (count * sizeof(struct dx_entry));
-	old_csum = t->dt_checksum;
+	save_csum = t->dt_checksum;
 	t->dt_checksum = 0;
 	csum = ext4_chksum(sbi, ei->i_csum_seed, (__u8 *)dirent, size);
 	csum = ext4_chksum(sbi, csum, (__u8 *)t, sizeof(struct dx_tail));
-	t->dt_checksum = old_csum;
+	t->dt_checksum = save_csum;
 
 	return cpu_to_le32(csum);
 }

fs/ext4/super.c

@@ -1952,16 +1952,16 @@ static __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
 	if ((sbi->s_es->s_feature_ro_compat &
 	     cpu_to_le32(EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))) {
 		/* Use new metadata_csum algorithm */
-		__u16 old_csum;
+		__le16 save_csum;
 		__u32 csum32;
 
-		old_csum = gdp->bg_checksum;
+		save_csum = gdp->bg_checksum;
 		gdp->bg_checksum = 0;
 		csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
 				     sizeof(le_group));
 		csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp,
 				     sbi->s_desc_size);
-		gdp->bg_checksum = old_csum;
+		gdp->bg_checksum = save_csum;
 
 		crc = csum32 & 0xFFFF;
 		goto out;

fs/ext4/xattr.c

@@ -122,17 +122,18 @@ static __le32 ext4_xattr_block_csum(struct inode *inode,
 				    struct ext4_xattr_header *hdr)
 {
 	struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
-	__u32 csum, old;
+	__u32 csum;
+	__le32 save_csum;
+	__le64 dsk_block_nr = cpu_to_le64(block_nr);
 
-	old = hdr->h_checksum;
+	save_csum = hdr->h_checksum;
 	hdr->h_checksum = 0;
-	block_nr = cpu_to_le64(block_nr);
-	csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&block_nr,
-			   sizeof(block_nr));
+	csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&dsk_block_nr,
+			   sizeof(dsk_block_nr));
 	csum = ext4_chksum(sbi, csum, (__u8 *)hdr,
 			   EXT4_BLOCK_SIZE(inode->i_sb));
 
-	hdr->h_checksum = old;
+	hdr->h_checksum = save_csum;
 	return cpu_to_le32(csum);
 }
 

include/trace/events/ext4.h

@@ -1948,7 +1948,7 @@ TRACE_EVENT(ext4_remove_blocks,
 		__entry->to		= to;
 		__entry->partial	= partial_cluster;
 		__entry->ee_pblk	= ext4_ext_pblock(ex);
-		__entry->ee_lblk	= cpu_to_le32(ex->ee_block);
+		__entry->ee_lblk	= le32_to_cpu(ex->ee_block);
 		__entry->ee_len		= ext4_ext_get_actual_len(ex);
 	),
 
@@ -2052,7 +2052,7 @@ TRACE_EVENT(ext4_ext_remove_space,
 
 TRACE_EVENT(ext4_ext_remove_space_done,
 	TP_PROTO(struct inode *inode, ext4_lblk_t start, int depth,
-		ext4_lblk_t partial, unsigned short eh_entries),
+		ext4_lblk_t partial, __le16 eh_entries),
 
 	TP_ARGS(inode, start, depth, partial, eh_entries),
 
@@ -2071,7 +2071,7 @@ TRACE_EVENT(ext4_ext_remove_space_done,
 		__entry->start		= start;
 		__entry->depth		= depth;
 		__entry->partial	= partial;
-		__entry->eh_entries	= eh_entries;
+		__entry->eh_entries	= le16_to_cpu(eh_entries);
 	),
 
 	TP_printk("dev %d,%d ino %lu since %u depth %d partial %u "