| /* 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 */ |
