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