/* SPDX-License-Identifier: GPL-2.0 */ #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