Add kernel version checking macro

It contains a macro to help checking for kernel version ranges.

Signed-off-by: Simon Marchi <simon.marchi@polymtl.ca>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

diff --git a/lttng-kernel-version.h b/lttng-kernel-version.h
new file mode 100644 (file)
index 0000000..280a398
--- /dev/null
+++ b/lttng-kernel-version.h
@@ -0,0 +1,36 @@
+#ifndef _LTTNG_KERNEL_VERSION_H
+#define _LTTNG_KERNEL_VERSION_H
+
+/*
+ * lttng-kernel-version.h
+ *
+ * Contains helpers to check more complex kernel version conditions.
+ *
+ * Copyright (C) 2012 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
+ */
+
+#include <linux/version.h>
+
+/*
+ * This macro checks if the kernel version is between the two specified
+ * versions (inclusive).
+ */
+#define LTTNG_KERNEL_RANGE(a_low, b_low, c_low, a_high, b_high, c_high) \
+       (LINUX_VERSION_CODE >= KERNEL_VERSION(a_low, b_low, c_low) && \
+        LINUX_VERSION_CODE <= KERNEL_VERSION(a_high, b_high, c_high))
+
+#endif /* _LTTNG_KERNEL_VERSION_H */