Release 4.12 include/linux/util_macros.h

#ifndef _LINUX_HELPER_MACROS_H_

#define _LINUX_HELPER_MACROS_H_


#define __find_closest(x, a, as, op)					\
({                                                                      \
        typeof(as) __fc_i, __fc_as = (as) - 1;                          \
        typeof(x) __fc_x = (x);                                         \
        typeof(*a) const *__fc_a = (a);                                 \
        for (__fc_i = 0; __fc_i < __fc_as; __fc_i++) {                  \
                if (__fc_x op DIV_ROUND_CLOSEST(__fc_a[__fc_i] +        \
                                                __fc_a[__fc_i + 1], 2)) \
                        break;                                          \
        }                                                               \
        (__fc_i);                                                       \
})

/**
 * find_closest - locate the closest element in a sorted array
 * @x: The reference value.
 * @a: The array in which to look for the closest element. Must be sorted
 *  in ascending order.
 * @as: Size of 'a'.
 *
 * Returns the index of the element closest to 'x'.
 */

#define find_closest(x, a, as) __find_closest(x, a, as, <=)

/**
 * find_closest_descending - locate the closest element in a sorted array
 * @x: The reference value.
 * @a: The array in which to look for the closest element. Must be sorted
 *  in descending order.
 * @as: Size of 'a'.
 *
 * Similar to find_closest() but 'a' is expected to be sorted in descending
 * order.
 */

#define find_closest_descending(x, a, as) __find_closest(x, a, as, >=)

#endif
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Directory: include/linux

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