-#ifndef _LTTNG_KERNEL_VERSION_H
-#define _LTTNG_KERNEL_VERSION_H
-
-/*
+/* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
+ *
* lttng-kernel-version.h
*
- * Contains helpers to check more complex kernel version conditions.
+ * Contains helpers to check kernel version conditions.
*
* Copyright (C) 2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ */
+
+#ifndef _LTTNG_KERNEL_VERSION_H
+#define _LTTNG_KERNEL_VERSION_H
+
+#include <linux/version.h>
+
+/*
+ * The following defines are extracted from the toplevel Linux Makefile and
+ * passed on the command line -with '-D'.
+ */
+
+#ifndef LTTNG_LINUX_MAJOR
+#define LTTNG_LINUX_MAJOR 0
+#endif
+
+#ifndef LTTNG_LINUX_MINOR
+#define LTTNG_LINUX_MINOR 0
+#endif
+
+#ifndef LTTNG_LINUX_PATCH
+#define LTTNG_LINUX_PATCH 0
+#endif
+
+/*
+ * Some stable releases have overflowed the 8bits allocated to the sublevel in
+ * the version code. To determine if the current kernel is affected, use the
+ * sublevel version from the Makefile. This is currently true for the 4.4.256
+ * and 4.9.256 stable releases.
*
- * 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.
+ * When the sublevel has overflowed, use the values from the Makefile instead
+ * of LINUX_VERSION_CODE from the kernel headers and allocate 16bits.
+ * Otherwise, keep using the version code from the headers to minimise the
+ * behavior change and avoid regressions.
*
- * 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
+ * Cast the result to uint64_t to prevent overflowing when we append distro
+ * specific version information.
*/
+#if (LTTNG_LINUX_PATCH >= 256)
-#include <linux/version.h>
+#define LTTNG_KERNEL_VERSION(a, b, c) \
+ ((((a) << 24) + ((b) << 16) + (c)) * 1ULL)
+
+#define LTTNG_LINUX_VERSION_CODE \
+ LTTNG_KERNEL_VERSION(LTTNG_LINUX_MAJOR, LTTNG_LINUX_MINOR, LTTNG_LINUX_PATCH)
+
+#else
+
+#define LTTNG_KERNEL_VERSION(a, b, c) (KERNEL_VERSION(a, b, c) * 1ULL)
+#define LTTNG_LINUX_VERSION_CODE (LINUX_VERSION_CODE * 1ULL)
+
+#endif
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,33))
+#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(2,6,33))
#include <generated/utsrelease.h>
-#else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,33)) */
+#else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(2,6,33)) */
#include <linux/utsrelease.h>
-#endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,33)) */
+#endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(2,6,33)) */
/*
* This macro checks if the kernel version is between the two specified
* versions (lower limit inclusive, upper limit exclusive).
*/
#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))
+ (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(a_low, b_low, c_low) && \
+ LTTNG_LINUX_VERSION_CODE < LTTNG_KERNEL_VERSION(a_high, b_high, c_high))
/* Ubuntu */
#define LTTNG_UBUNTU_KERNEL_VERSION(a, b, c, d) \
- (((a) << 24) + ((b) << 16) + ((c) << 8) + (d))
+ (((LTTNG_KERNEL_VERSION(a, b, c)) << 16) + (d))
#ifdef UTS_UBUNTU_RELEASE_ABI
#define LTTNG_UBUNTU_VERSION_CODE \
- ((LINUX_VERSION_CODE << 8) + UTS_UBUNTU_RELEASE_ABI)
+ ((LTTNG_LINUX_VERSION_CODE << 16) + UTS_UBUNTU_RELEASE_ABI)
#else
#define LTTNG_UBUNTU_VERSION_CODE 0
#endif
/* Debian */
#define LTTNG_DEBIAN_KERNEL_VERSION(a, b, c, d, e, f) \
- (((((a) << 16) + ((b) << 8) + (c)) * 1000000ULL) + ((d) * 10000) + ((e) * 100) + (f))
+ (((LTTNG_KERNEL_VERSION(a, b, c)) * 1000000ULL) + ((d) * 10000) + ((e) * 100) + (f))
#ifdef DEBIAN_API_VERSION
#define LTTNG_DEBIAN_VERSION_CODE \
- ((LINUX_VERSION_CODE * 1000000ULL) + DEBIAN_API_VERSION)
+ ((LTTNG_LINUX_VERSION_CODE * 1000000ULL) + DEBIAN_API_VERSION)
#else
#define LTTNG_DEBIAN_VERSION_CODE 0
#endif
LTTNG_DEBIAN_KERNEL_VERSION(a_high, b_high, c_high, d_high, e_high, f_high))
#define LTTNG_RHEL_KERNEL_VERSION(a, b, c, d, e, f) \
- (((((a) << 16) + ((b) << 8) + (c)) * 10000000ULL) + ((d) * 10000) + ((e) * 100) + (f))
+ (((LTTNG_KERNEL_VERSION(a, b, c)) * 100000000ULL) + ((d) * 10000) + ((e) * 100) + (f))
/* RHEL */
#ifdef RHEL_API_VERSION
#define LTTNG_RHEL_VERSION_CODE \
- ((LINUX_VERSION_CODE * 10000000ULL) + RHEL_API_VERSION)
+ ((LTTNG_LINUX_VERSION_CODE * 100000000ULL) + RHEL_API_VERSION)
#else
#define LTTNG_RHEL_VERSION_CODE 0
#endif
/* SUSE Linux enterprise */
#define LTTNG_SLE_KERNEL_VERSION(a, b, c, d, e, f) \
- (((((a) << 16) + ((b) << 8) + (c)) * 10000000ULL) + ((d) * 10000) + ((e) * 100) + (f))
+ (((LTTNG_KERNEL_VERSION(a, b, c)) * 100000000ULL) + ((d) * 100000) + ((e) * 100) + (f))
#ifdef SLE_API_VERSION
#define LTTNG_SLE_VERSION_CODE \
- ((LINUX_VERSION_CODE * 10000000ULL) + SLE_API_VERSION)
+ ((LTTNG_LINUX_VERSION_CODE * 100000000ULL) + SLE_API_VERSION)
#else
#define LTTNG_SLE_VERSION_CODE 0
#endif
/* Fedora */
#define LTTNG_FEDORA_KERNEL_VERSION(a, b, c, d) \
- (((((a) << 16) + ((b) << 8) + (c)) * 10000ULL) + (d))
+ (((LTTNG_KERNEL_VERSION(a, b, c)) * 10000ULL) + (d))
#ifdef FEDORA_REVISION_VERSION
#define LTTNG_FEDORA_VERSION_CODE \
- ((LINUX_VERSION_CODE * 10000ULL) + FEDORA_REVISION_VERSION)
+ ((LTTNG_LINUX_VERSION_CODE * 10000ULL) + FEDORA_REVISION_VERSION)
#else
#define LTTNG_FEDORA_VERSION_CODE 0
#endif
/* RT patch */
#define LTTNG_RT_KERNEL_VERSION(a, b, c, d) \
- (((a) << 24) + ((b) << 16) + ((c) << 8) + (d))
+ (((LTTNG_KERNEL_VERSION(a, b, c)) << 16) + (d))
#ifdef RT_PATCH_VERSION
#define LTTNG_RT_VERSION_CODE \
- ((LINUX_VERSION_CODE << 8) + RT_PATCH_VERSION)
+ ((LTTNG_LINUX_VERSION_CODE << 16) + RT_PATCH_VERSION)
#else
#define LTTNG_RT_VERSION_CODE 0
#endif
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