Commit ee38e514 authored by Rusty Russell's avatar Rusty Russell
Browse files

frv: define __fls 



Like fls, but can't be handed 0 and returns the bit number.

Signed-off-by: default avatarRusty Russell <rusty@rustcorp.com.au>
parent 0999769e

include/asm-frv/bitops.h

+13 −0
Original line number Diff line number Diff line
@@ -339,6 +339,19 @@ int __ffs(unsigned long x) 
	return 31 - bit;

}



/**

 * __fls - find last (most-significant) set bit in a long word

 * @word: the word to search

 *

 * Undefined if no set bit exists, so code should check against 0 first.

 */

static inline unsigned long __fls(unsigned long word)

{

	unsigned long bit;

	asm("scan %1,gr0,%0" : "=r"(bit) : "r"(word));

	return bit;

}



/*

 * special slimline version of fls() for calculating ilog2_u32()

 * - note: no protection against n == 0