/* SPDX-License-Identifier: GPL-2.0 */ #ifndef __ASM_S390_RWONCE_H #define __ASM_S390_RWONCE_H #include <linux/compiler_types.h> /* * Use READ_ONCE_ALIGNED_128() for 128-bit block concurrent (atomic) read * accesses. Note that x must be 128-bit aligned, otherwise a specification * exception is generated. */ #define READ_ONCE_ALIGNED_128(x) \ ({ \ union { \ typeof(x) __x; \ __uint128_t val; \ } __u; \ \ BUILD_BUG_ON(sizeof(x) != 16); \ asm volatile( \ " lpq %[val],%[_x]\n" \ : [val] "=d" (__u.val) \ : [_x] "QS" (x) \ : "memory"); \ __u.__x; \ }) #include <asm-generic/rwonce.h> #endif /* __ASM_S390_RWONCE_H */