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authorAndrew Morton <akpm@linux-foundation.org>2008-04-28 02:16:30 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-28 08:58:47 -0700
commit73f20e58b1d586e9f6d3ddc3aad872829aca7743 (patch)
treecd426ad1186438a0b16ade918e73c0b84c4bbe92
parentc7a6c4edc74ee5c3d990325fe93b6916f43499f4 (diff)
FAT_VALID_MEDIA(): remove pointless test
The on-disk media specification field in FAT is only 8-bits, so testing for <=0xff is pointless, and can generate a "comparison is always true due to limited range of data type" warning. While we're there, convert FAT_VALID_MEDIA() into a C function - the present implementation is buggy: it generates either one or two references to its argument. Cc: Frank Seidel <fseidel@suse.de> Acked-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--fs/fat/inode.c2
-rw-r--r--include/linux/msdos_fs.h6
2 files changed, 6 insertions, 2 deletions
diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index 1604a8a5c01..bf918929e79 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -1215,7 +1215,7 @@ int fat_fill_super(struct super_block *sb, void *data, int silent,
*/
media = b->media;
- if (!FAT_VALID_MEDIA(media)) {
+ if (!fat_valid_media(media)) {
if (!silent)
printk(KERN_ERR "FAT: invalid media value (0x%02x)\n",
media);
diff --git a/include/linux/msdos_fs.h b/include/linux/msdos_fs.h
index 0bca157ddca..b03b2745741 100644
--- a/include/linux/msdos_fs.h
+++ b/include/linux/msdos_fs.h
@@ -58,7 +58,11 @@
#define MSDOS_DOTDOT ".. " /* "..", padded to MSDOS_NAME chars */
/* media of boot sector */
-#define FAT_VALID_MEDIA(x) ((0xF8 <= (x) && (x) <= 0xFF) || (x) == 0xF0)
+static inline int fat_valid_media(u8 media)
+{
+ return 0xf8 <= media || media == 0xf0;
+}
+
#define FAT_FIRST_ENT(s, x) ((MSDOS_SB(s)->fat_bits == 32 ? 0x0FFFFF00 : \
MSDOS_SB(s)->fat_bits == 16 ? 0xFF00 : 0xF00) | (x))