From 236233f79b01cd3d9f7717650a46bda8c0d7ab85 Mon Sep 17 00:00:00 2001
From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Wed, 25 Nov 2020 15:50:16 -0500
Subject: [PATCH] Introduce limits wrapper

Older kernels (v3.13.11 and older on the CI) miss the U32_MAX
macro. Implement them in a wrapper.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
---
 include/counter/counter-api.h                 |  1 +
 include/wrapper/limits.h                      | 60 +++++++++++++++++++
 src/lttng-ring-buffer-event-notifier-client.h |  1 +
 3 files changed, 62 insertions(+)
 create mode 100644 include/wrapper/limits.h

diff --git a/include/counter/counter-api.h b/include/counter/counter-api.h
index f2829fc5..827fb6f8 100644
--- a/include/counter/counter-api.h
+++ b/include/counter/counter-api.h
@@ -15,6 +15,7 @@
 #include <linux/bitops.h>
 #include <counter/counter.h>
 #include <counter/counter-internal.h>
+#include <wrapper/limits.h>
 
 /*
  * Using unsigned arithmetic because overflow is defined.
diff --git a/include/wrapper/limits.h b/include/wrapper/limits.h
new file mode 100644
index 00000000..832c2f7f
--- /dev/null
+++ b/include/wrapper/limits.h
@@ -0,0 +1,60 @@
+/* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
+ *
+ * wrapper/limits.h
+ *
+ * Copyright (C) 2020 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ */
+
+#ifndef _LTTNG_WRAPPER_LIMITS_H
+#define _LTTNG_WRAPPER_LIMITS_H
+
+#include <linux/limits.h>
+
+#ifndef SIZE_MAX
+#define SIZE_MAX	(~(size_t)0)
+#endif
+#ifndef PHYS_ADDR_MAX
+#define PHYS_ADDR_MAX	(~(phys_addr_t)0)
+#endif
+
+#ifndef U8_MAX
+#define U8_MAX		((u8)~0U)
+#endif
+#ifndef S8_MAX
+#define S8_MAX		((s8)(U8_MAX >> 1))
+#endif
+#ifndef S8_MIN
+#define S8_MIN		((s8)(-S8_MAX - 1))
+#endif
+#ifndef U16_MAX
+#define U16_MAX		((u16)~0U)
+#endif
+#ifndef S16_MAX
+#define S16_MAX		((s16)(U16_MAX >> 1))
+#endif
+#ifndef S16_MIN
+#define S16_MIN		((s16)(-S16_MAX - 1))
+#endif
+#ifndef U32_MAX
+#define U32_MAX		((u32)~0U)
+#endif
+#ifndef U32_MIN
+#define U32_MIN		((u32)0)
+#endif
+#ifndef S32_MAX
+#define S32_MAX		((s32)(U32_MAX >> 1))
+#endif
+#ifndef S32_MIN
+#define S32_MIN		((s32)(-S32_MAX - 1))
+#endif
+#ifndef U64_MAX
+#define U64_MAX		((u64)~0ULL)
+#endif
+#ifndef S64_MAX
+#define S64_MAX		((s64)(U64_MAX >> 1))
+#endif
+#ifndef S64_MIN
+#define S64_MIN		((s64)(-S64_MAX - 1))
+#endif
+
+#endif /* _LTTNG_WRAPPER_COMPILER_H */
diff --git a/src/lttng-ring-buffer-event-notifier-client.h b/src/lttng-ring-buffer-event-notifier-client.h
index a857c8f7..b5e91c55 100644
--- a/src/lttng-ring-buffer-event-notifier-client.h
+++ b/src/lttng-ring-buffer-event-notifier-client.h
@@ -14,6 +14,7 @@
 #include <lttng/abi.h>
 #include <lttng/events.h>
 #include <lttng/tracer.h>
+#include <wrapper/limits.h>
 
 static struct lttng_transport lttng_relay_transport;
 
-- 
2.34.1