From: Andrew Morton Date: Mon, 28 Apr 2008 09:16:30 +0000 (-0700) Subject: FAT_VALID_MEDIA(): remove pointless test X-Git-Tag: v2.6.26-rc1~722 X-Git-Url: http://ftp.safe.ca/?p=safe%2Fjmp%2Flinux-2.6;a=commitdiff_plain;h=73f20e58b1d586e9f6d3ddc3aad872829aca7743 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 Acked-by: OGAWA Hirofumi Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/fs/fat/inode.c b/fs/fat/inode.c index 1604a8a..bf91892 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 0bca157..b03b274 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))