Hi Shashank,
On 9 October 2015 at 20:28, Shashank Sharma shashank.sharma@intel.com wrote: [snip]
+/* Color management bit utilities */ +#define GET_BIT_MASK(n) ((1 << n) - 1)
+/* Read bits of a word from bit no. 'start'(lsb) till 'n' bits */ +#define GET_BITS(x, start, nbits) ((x >> start) & GET_BIT_MASK(nbits))
+/* Round off by adding 1 to the immediate lower bit */ +#define GET_BITS_ROUNDOFF(x, start, nbits) \
((GET_BITS(x, start, (nbits + 1)) + 1) >> 1)+/* Clear bits of a word from bit no. 'start' till nbits */ +#define CLEAR_BITS(x, start, nbits) ( \
x &= ~((GET_BIT_MASK(nbits) << start)))+/* Write bit_pattern of no_bits bits in a target word */ +#define SET_BITS(target, bit_pattern, start_bit, no_bits) \
do { \CLEAR_BITS(target, start_bit, no_bits); \target |= (bit_pattern << start_bit); \} while (0)
It feels suspicious that the kernel does not have macros for either one of these.
I would invite you to take a look at include/linux/bitops.h and other kernel headers.
Regards, Emil