uatomic: Fix header guard comment
[urcu.git] / include / urcu / uatomic / riscv.h
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1// SPDX-FileCopyrightText: 2018 Michael Jeanson <mjeanson@efficios.com>
2//
3// SPDX-License-Identifier: MIT
4
5/*
6 * Atomic exchange operations for the RISC-V architecture.
7 *
8 * Let the compiler do it.
9 */
10
11#ifndef _URCU_ARCH_UATOMIC_RISCV_H
12#define _URCU_ARCH_UATOMIC_RISCV_H
13
14#include <urcu/compiler.h>
15#include <urcu/system.h>
16
17/*
18 * See <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104831> for details.
19 *
20 * The following GCC patches are required to have a working Userspace RCU on
21 * the RISC-V architecture. The were introduced in GCC 14 and backported to
22 * 13.3.0.
23 *
24 * - <https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=dcd7b2f5f7233a04c8b14b362d0befa76e9654c0>
25 * - <https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=4990cf84c460f064d6281d0813f20b0ef20c7448>
26 * - <https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=d199d2e56da2379004e7e0457150409c0c99d3e6>
27 */
28#ifdef URCU_GCC_VERSION
29# if (URCU_GCC_VERSION < 130300)
30# error "Implementations of some atomic operations of GCC < 13.3.0 for RISC-V are insufficient for sequential consistency. For this reason Userspace RCU is currently marked as 'broken' for RISC-V on these GCC versions."
31# endif
32#endif
33
34#ifdef __cplusplus
35extern "C" {
36#endif
37
38#define UATOMIC_HAS_ATOMIC_BYTE
39#define UATOMIC_HAS_ATOMIC_SHORT
40
41#ifdef __cplusplus
42}
43#endif
44
45#include <urcu/uatomic/generic.h>
46
47#endif /* _URCU_ARCH_UATOMIC_RISCV_H */
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