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FAT_VALID_MEDIA(): remove pointless test

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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>
This commit is contained in:
Andrew Morton 2008-04-28 02:16:30 -07:00 • committed by Linus Torvalds
commit 73f20e58b1
2 changed files with 6 additions and 2 deletions
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6
include/linux/msdos_fs.h
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@ -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))