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/* 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 */