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bitops: Add fls_long and __ffs64

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Add fls_long and __ffs64 support to align with the kernel bitops
implementation.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
This commit is contained in:
Fabio Estevam 2015-11-05 12:43:38 -02:00 • committed by Tom Rini
parent 61a177767c
commit de4d2e9e7c
1 changed files with 27 additions and 0 deletions
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27
include/linux/bitops.h
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@ -2,6 +2,7 @@
#define _LINUX_BITOPS_H #define _LINUX_BITOPS_H
#include <asm/types.h> #include <asm/types.h>
#include <linux/compiler.h>
#define BIT(nr) (1UL << (nr)) #define BIT(nr) (1UL << (nr))
#define BIT_MASK(nr) (1UL << ((nr) % BITS_PER_LONG)) #define BIT_MASK(nr) (1UL << ((nr) % BITS_PER_LONG))
@ -139,6 +140,32 @@ static inline unsigned int generic_hweight8(unsigned int w)
# define fls generic_fls # define fls generic_fls
#endif #endif
static inline unsigned fls_long(unsigned long l)
{
if (sizeof(l) == 4)
return fls(l);
return fls64(l);
}
/**
* __ffs64 - find first set bit in a 64 bit word
* @word: The 64 bit word
*
* On 64 bit arches this is a synomyn for __ffs
* The result is not defined if no bits are set, so check that @word
* is non-zero before calling this.
*/
static inline unsigned long __ffs64(u64 word)
{
#if BITS_PER_LONG == 32
if (((u32)word) == 0UL)
return __ffs((u32)(word >> 32)) + 32;
#elif BITS_PER_LONG != 64
#error BITS_PER_LONG not 32 or 64
#endif
return __ffs((unsigned long)word);
}
/** /**
* __set_bit - Set a bit in memory * __set_bit - Set a bit in memory
* @nr: the bit to set * @nr: the bit to set