| /* 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 */ |