Drop 'asm/barrier.h' wrapper

[lttng-modules.git] / include / wrapper / barrier.h

diff --git a/include/wrapper/barrier.h b/include/wrapper/barrier.h
deleted file mode 100644 (file)
index 9d47ad7..0000000
--- a/include/wrapper/barrier.h
+++ /dev/null
@@ -1,51 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-only
- *
- * wrapper/barrier.h
- *
- * wrapper around asm/barrier.h.
- *
- * Copyright (C) 2020 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- */
-
-#ifndef _LTTNG_WRAPPER_BARRIER_H
-#define _LTTNG_WRAPPER_BARRIER_H
-
-#include <lttng/kernel-version.h>
-#if LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)
-#include <asm/barrier.h>
-#else
-#include <asm/system.h>
-#endif
-
-#if LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,14,0)
-
-#define lttng_smp_store_release(x, v) smp_store_release(x, v)
-#define lttng_smp_load_acquire(x) smp_load_acquire(x)
-
-#else
-
-/*
- * Acquire-release semantics act as a one-way permeable barrier when
- * pairing a store with a release. Use a full memory barrier to emulate
- * the acquire-release semantic with a stronger barrier on older
- * kernels.
- */
-
-#define lttng_smp_store_release(x, v)          \
-       do {                                    \
-               smp_mb();                       \
-               ACCESS_ONCE(*(x)) = (v);        \
-       } while (0)
-
-#define lttng_smp_load_acquire(x)              \
-       ({                                      \
-               __typeof__(*(x)) ___ret;        \
-                                               \
-               ___ret = ACCESS_ONCE(*(x));     \
-               smp_mb();                       \
-               ___ret;                         \
-       })
-
-#endif
-
-#endif /* _LTTNG_WRAPPER_BARRIER_H */