befs: annotate fs32 on tests for superblock endianness

Does compile-time byteswapping rather than runtime.

Noticed by sparse:
fs/befs/super.c:29:6: warning: cast to restricted __le32
fs/befs/super.c:29:6: warning: cast from restricted fs32
fs/befs/super.c:31:11: warning: cast to restricted __be32
fs/befs/super.c:31:11: warning: cast from restricted fs32
fs/befs/super.c:31:11: warning: cast to restricted __be32
fs/befs/super.c:31:11: warning: cast from restricted fs32
fs/befs/super.c:31:11: warning: cast to restricted __be32
fs/befs/super.c:31:11: warning: cast from restricted fs32
fs/befs/super.c:31:11: warning: cast to restricted __be32
fs/befs/super.c:31:11: warning: cast from restricted fs32
fs/befs/super.c:31:11: warning: cast to restricted __be32
fs/befs/super.c:31:11: warning: cast from restricted fs32
fs/befs/super.c:31:11: warning: cast to restricted __be32
fs/befs/super.c:31:11: warning: cast from restricted fs32
fs/befs/linuxvfs.c:811:7: warning: cast to restricted __le32
fs/befs/linuxvfs.c:811:7: warning: cast from restricted fs32
fs/befs/linuxvfs.c:812:7: warning: cast to restricted __be32
fs/befs/linuxvfs.c:812:7: warning: cast from restricted fs32
fs/befs/linuxvfs.c:812:7: warning: cast to restricted __be32
fs/befs/linuxvfs.c:812:7: warning: cast from restricted fs32
fs/befs/linuxvfs.c:812:7: warning: cast to restricted __be32
fs/befs/linuxvfs.c:812:7: warning: cast from restricted fs32
fs/befs/linuxvfs.c:812:7: warning: cast to restricted __be32
fs/befs/linuxvfs.c:812:7: warning: cast from restricted fs32
fs/befs/linuxvfs.c:812:7: warning: cast to restricted __be32
fs/befs/linuxvfs.c:812:7: warning: cast from restricted fs32
fs/befs/linuxvfs.c:812:7: warning: cast to restricted __be32
fs/befs/linuxvfs.c:812:7: warning: cast from restricted fs32

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Cc: "Sergey S. Kostyliov" <rathamahata@php4.ru>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/befs/befs_fs_types.h b/fs/befs/befs_fs_types.h
index e2595c2..7893eaa 100644 (file)
--- a/fs/befs/befs_fs_types.h
+++ b/fs/befs/befs_fs_types.h
@@ -55,8 +55,12 @@ enum super_flags {
 };
 
 #define BEFS_BYTEORDER_NATIVE 0x42494745
+#define BEFS_BYTEORDER_NATIVE_LE (__force fs32)cpu_to_le32(BEFS_BYTEORDER_NATIVE)
+#define BEFS_BYTEORDER_NATIVE_BE (__force fs32)cpu_to_be32(BEFS_BYTEORDER_NATIVE)
 
 #define BEFS_SUPER_MAGIC BEFS_SUPER_MAGIC1
+#define BEFS_SUPER_MAGIC1_LE (__force fs32)cpu_to_le32(BEFS_SUPER_MAGIC1)
+#define BEFS_SUPER_MAGIC1_BE (__force fs32)cpu_to_be32(BEFS_SUPER_MAGIC1)
 
 /*
  * Flags of inode

diff --git a/fs/befs/linuxvfs.c b/fs/befs/linuxvfs.c
index 9286b2a..b6dfee3 100644 (file)
--- a/fs/befs/linuxvfs.c
+++ b/fs/befs/linuxvfs.c
@@ -809,8 +809,8 @@ befs_fill_super(struct super_block *sb, void *data, int silent)
 
        /* account for offset of super block on x86 */
        disk_sb = (befs_super_block *) bh->b_data;
-       if ((le32_to_cpu(disk_sb->magic1) == BEFS_SUPER_MAGIC1) ||
-           (be32_to_cpu(disk_sb->magic1) == BEFS_SUPER_MAGIC1)) {
+       if ((disk_sb->magic1 == BEFS_SUPER_MAGIC1_LE) ||
+           (disk_sb->magic1 == BEFS_SUPER_MAGIC1_BE)) {
                befs_debug(sb, "Using PPC superblock location");
        } else {
                befs_debug(sb, "Using x86 superblock location");

diff --git a/fs/befs/super.c b/fs/befs/super.c
index 8c3401f..41f2b4d 100644 (file)
--- a/fs/befs/super.c
+++ b/fs/befs/super.c
@@ -26,10 +26,10 @@ befs_load_sb(struct super_block *sb, befs_super_block * disk_sb)
        befs_sb_info *befs_sb = BEFS_SB(sb);
 
        /* Check the byte order of the filesystem */
-       if (le32_to_cpu(disk_sb->fs_byte_order) == BEFS_BYTEORDER_NATIVE)
+       if (disk_sb->fs_byte_order == BEFS_BYTEORDER_NATIVE_LE)
            befs_sb->byte_order = BEFS_BYTESEX_LE;
-       else if (be32_to_cpu(disk_sb->fs_byte_order) == BEFS_BYTEORDER_NATIVE)
-           befs_sb->byte_order = BEFS_BYTESEX_BE;      
+       else if (disk_sb->fs_byte_order == BEFS_BYTEORDER_NATIVE_BE)
+           befs_sb->byte_order = BEFS_BYTESEX_BE;
 
        befs_sb->magic1 = fs32_to_cpu(sb, disk_sb->magic1);
        befs_sb->magic2 = fs32_to_cpu(sb, disk_sb->magic2);