1 /* SPDX-License-Identifier: GPL-2.0 */ 2 3 #ifndef __ASM_S390_RWONCE_H 4 #define __ASM_S390_RWONCE_H 5 6 #include <linux/compiler_types.h> 7 8 /* 9 * Use READ_ONCE_ALIGNED_128() for 128-bit block concurrent (atomic) read 10 * accesses. Note that x must be 128-bit aligned, otherwise a specification 11 * exception is generated. 12 */ 13 #define READ_ONCE_ALIGNED_128(x) \ 14 ({ \ 15 union { \ 16 typeof(x) __x; \ 17 __uint128_t val; \ 18 } __u; \ 19 \ 20 BUILD_BUG_ON(sizeof(x) != 16); \ 21 asm volatile( \ 22 " lpq %[val],%[_x]\n" \ 23 : [val] "=d" (__u.val) \ 24 : [_x] "QS" (x) \ 25 : "memory"); \ 26 __u.__x; \ 27 }) 28 29 #include <asm-generic/rwonce.h> 30 31 #endif /* __ASM_S390_RWONCE_H */ 32