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Commit 92fc7072 authored by David Howells's avatar David Howells Committed by Linus Torvalds
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[PATCH] FRV: Fix fls() to handle bit 31 being set correctly 



Fix FRV fls() to handle bit 31 being set correctly (it should return 32 not 0).

Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent af8c65b5

include/asm-frv/bitops.h

+17 −4
Original line number Diff line number Diff line
@@ -161,16 +161,29 @@ static inline int __test_bit(int nr, const volatile void * addr) 
#include <asm-generic/bitops/__ffs.h>

#include <asm-generic/bitops/find.h>



/*

 * fls: find last bit set.

/**

 * fls - find last bit set

 * @x: the word to search

 *

 * This is defined the same way as ffs:

 * - return 32..1 to indicate bit 31..0 most significant bit set

 * - return 0 to indicate no bits set

 */

#define fls(x)						\

({							\

	int bit;					\

							\

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

	asm("	subcc	%1,gr0,gr0,icc0		\n"	\

	    "	ckne	icc0,cc4		\n"	\

	    "	cscan.p	%1,gr0,%0	,cc4,#1	\n"	\

	    "	csub	%0,%0,%0	,cc4,#0	\n"	\

	    "   csub    %2,%0,%0	,cc4,#1	\n"	\

	    : "=&r"(bit)				\

	    : "r"(x), "r"(32)				\

	    : "icc0", "cc4"				\

	    );						\

							\

	bit ? 33 - bit : bit;				\

	bit;						\

})



#include <asm-generic/bitops/fls64.h>