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/* SPDX-License-Identifier: GPL-2.0 */ /* * Kernel interface for the s390 arch_random_* functions * * Copyright IBM Corp. 2017, 2022 * * Author: Harald Freudenberger * */ #ifndef _ASM_S390_ARCHRANDOM_H #define _ASM_S390_ARCHRANDOM_H #ifdef CONFIG_ARCH_RANDOM #include #include #include #include DECLARE_STATIC_KEY_FALSE(s390_arch_random_available); extern atomic64_t s390_arch_random_counter; static inline bool __must_check arch_get_random_long(unsigned long *v) { return false; } static inline bool __must_check arch_get_random_int(unsigned int *v) { return false; } static inline bool __must_check arch_get_random_seed_long(unsigned long *v) { if (static_branch_likely(&s390_arch_random_available) && in_task()) { cpacf_trng(NULL, 0, (u8 *)v, sizeof(*v)); atomic64_add(sizeof(*v), &s390_arch_random_counter); return true; } return false; } static inline