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Commit 3afe3925 authored by Harvey Harrison's avatar Harvey Harrison Committed by Linus Torvalds
Browse files

kernel: add bit rotation helpers for 16 and 8 bit 



Will replace open-coded variants elsewhere.  Done in the same
style as the 32-bit versions.

Signed-off-by: default avatarHarvey Harrison <harvey.harrison@gmail.com>
Acked-by: default avatarRandy Dunlap <randy.dunlap@oracle.com>
Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: John W. Linville <linville@tuxdriver.com>
Cc: Joe Perches <joe@perches.com>
Cc: Jiri Benc <jbenc@suse.cz>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 589499c0

include/linux/bitops.h

+40 −0
Original line number Diff line number Diff line
@@ -65,6 +65,46 @@ static inline __u32 ror32(__u32 word, unsigned int shift) 
	return (word >> shift) | (word << (32 - shift));

}



/**

 * rol16 - rotate a 16-bit value left

 * @word: value to rotate

 * @shift: bits to roll

 */

static inline __u16 rol16(__u16 word, unsigned int shift)

{

	return (word << shift) | (word >> (16 - shift));

}



/**

 * ror16 - rotate a 16-bit value right

 * @word: value to rotate

 * @shift: bits to roll

 */

static inline __u16 ror16(__u16 word, unsigned int shift)

{

	return (word >> shift) | (word << (16 - shift));

}



/**

 * rol8 - rotate an 8-bit value left

 * @word: value to rotate

 * @shift: bits to roll

 */

static inline __u8 rol8(__u8 word, unsigned int shift)

{

	return (word << shift) | (word >> (8 - shift));

}



/**

 * ror8 - rotate an 8-bit value right

 * @word: value to rotate

 * @shift: bits to roll

 */

static inline __u8 ror8(__u8 word, unsigned int shift)

{

	return (word >> shift) | (word << (8 - shift));

}



static inline unsigned fls_long(unsigned long l)

{

	if (sizeof(l) == 4)