aarch64: blacklist gcc prior to 5.1

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

diff --git a/wrapper/compiler.h b/wrapper/compiler.h
index e4533d4955c9cb03f4ed702c44bd66b8953d4f5c..7413891961f31c2fbc40104bb2b7284cc5b4808c 100644 (file)
--- a/wrapper/compiler.h
+++ b/wrapper/compiler.h
@@ -1,27 +1,15 @@
-#ifndef _LTTNG_WRAPPER_COMPILER_H
-#define _LTTNG_WRAPPER_COMPILER_H
-
-/*
+/* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
+ *
  * wrapper/compiler.h
  *
  * Copyright (C) 2013 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; only
- * version 2.1 of the License.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#ifndef _LTTNG_WRAPPER_COMPILER_H
+#define _LTTNG_WRAPPER_COMPILER_H
+
 #include <linux/compiler.h>
+#include <linux/version.h>
 
 /*
  * Don't allow compiling with buggy compiler.
@@ -37,6 +25,16 @@
 #   error Your gcc version produces clobbered frame accesses
 #  endif
 # endif
+
+/*
+ * https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63293
+ */
+# ifdef __aarch64__
+#  if GCC_VERSION < 50100
+#   error Your gcc version performs unsafe access to deallocated stack
+#  endif
+# endif
+
 #endif
 
 /*
@@ -52,4 +50,21 @@
 # define WRITE_ONCE(x, val)    ({ ACCESS_ONCE(x) = val; })
 #endif
 
+/*
+ * In v4.15 a smp read barrier was added to READ_ONCE to replace
+ * lockless_dereference(), replicate this behavior on prior kernels
+ * and remove calls to smp_read_barrier_depends which was dropped
+ * in v5.9.
+ */
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,15,0))
+#define LTTNG_READ_ONCE(x)     READ_ONCE(x)
+#else
+#define LTTNG_READ_ONCE(x)                     \
+({                                             \
+       typeof(x) __val = READ_ONCE(x);         \
+       smp_read_barrier_depends();             \
+       __val;                                  \
+})
+#endif
+
 #endif /* _LTTNG_WRAPPER_COMPILER_H */