Cleanup: Move wrapper/ headers to include/wrapper/

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

diff --git a/include/wrapper/compiler.h b/include/wrapper/compiler.h
new file mode 100644 (file)
index 0000000..38974c0
--- /dev/null
+++ b/include/wrapper/compiler.h
@@ -0,0 +1,44 @@
+/* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
+ *
+ * wrapper/compiler.h
+ *
+ * Copyright (C) 2013 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ */
+
+#ifndef _LTTNG_WRAPPER_COMPILER_H
+#define _LTTNG_WRAPPER_COMPILER_H
+
+#include <linux/compiler.h>
+
+/*
+ * Don't allow compiling with buggy compiler.
+ */
+
+#ifdef GCC_VERSION
+
+/*
+ * http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58854
+ */
+# ifdef __ARMEL__
+#  if GCC_VERSION >= 40800 && GCC_VERSION <= 40802
+#   error Your gcc version produces clobbered frame accesses
+#  endif
+# endif
+#endif
+
+/*
+ * READ/WRITE_ONCE were introduced in kernel 3.19 and ACCESS_ONCE
+ * was removed in 4.15. Prefer READ/WRITE but fallback to ACCESS
+ * when they are not available.
+ */
+#ifndef READ_ONCE
+# define READ_ONCE(x)          ACCESS_ONCE(x)
+#endif
+
+#ifndef WRITE_ONCE
+# define WRITE_ONCE(x, val)    ({ ACCESS_ONCE(x) = val; })
+#endif
+
+#define __LTTNG_COMPOUND_LITERAL(type, ...)    (type[]) { __VA_ARGS__ }
+
+#endif /* _LTTNG_WRAPPER_COMPILER_H */