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/* SPDX-License-Identifier: GPL-2.0 */ #ifndef __LINUX_PRIME_NUMBERS_H #define __LINUX_PRIME_NUMBERS_H #include <linux/types.h> bool is_prime_number(unsigned long x); unsigned long next_prime_number(unsigned long x); /** * for_each_prime_number - iterate over each prime upto a value * @prime: the current prime number in this iteration * @max: the upper limit * * Starting from the first prime number 2 iterate over each prime number up to * the @max value. On each iteration, @prime is set to the current prime number. * @max should be less than ULONG_MAX to ensure termination. To begin with * @prime set to 1 on the first iteration use for_each_prime_number_from() * instead. */ #define for_each_prime_number(prime, max) \ for_each_prime_number_from((prime), 2, (max)) /** * for_each_prime_number_from - iterate over each prime upto a value * @prime: the current prime number in this iteration * @from: the initial value * @max: the upper limit * * Starting from @from iterate over each successive prime number up to the * @max value. On each iteration, @prime is set to the current prime number. * @max should be less than ULONG_MAX, and @from less than @max, to ensure * termination. */ #define for_each_prime_number_from(prime, from, max) \ for (prime = (from); prime <= (max); prime = next_prime_number(prime)) #endif /* !__LINUX_PRIME_NUMBERS_H */