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utils: add a bitfield size macro

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Signed-off-by: Felix Fietkau <nbd@openwrt.org>
This commit is contained in:
Felix Fietkau 2014-04-30 13:27:03 +02:00
parent 31b3893a72
commit 9203927e58
1 changed files with 2 additions and 0 deletions
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utils.h
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@ -167,6 +167,8 @@ static inline uint16_t __u_bswap16(uint16_t val)
#define BITS_PER_LONG (8 * sizeof(unsigned long))
#endif
#define BITFIELD_SIZE(_n) (((_n) + (BITS_PER_LONG - 1)) / BITS_PER_LONG)
static inline void bitfield_set(unsigned long *bits, int bit)
{
bits[bit / BITS_PER_LONG] |= (1UL << (bit % BITS_PER_LONG));