*
* 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>
*/
#include <linux/version.h>
#include <generated/utsrelease.h>
-#define LTTNG_KERNEL_VERSION(a, b, c) KERNEL_VERSION(a, b, c)
-#define LTTNG_LINUX_VERSION_CODE LINUX_VERSION_CODE
+/*
+ * 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.
+ *
+ * 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.
+ *
+ * Cast the result to uint64_t to prevent overflowing when we append distro
+ * specific version information.
+ */
+#if (LTTNG_LINUX_PATCH >= 256)
+
+#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
/*
* This macro checks if the kernel version is between the two specified
/* Ubuntu */
#define LTTNG_UBUNTU_KERNEL_VERSION(a, b, c, d) \
- (((LTTNG_KERNEL_VERSION(a, b, c)) << 8) + (d))
+ (((LTTNG_KERNEL_VERSION(a, b, c)) << 16) + (d))
#ifdef UTS_UBUNTU_RELEASE_ABI
#define LTTNG_UBUNTU_VERSION_CODE \
- ((LTTNG_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
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) \
- (((LTTNG_KERNEL_VERSION(a, b, 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 \
- ((LTTNG_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) \
- (((LTTNG_KERNEL_VERSION(a, b, 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 \
- ((LTTNG_LINUX_VERSION_CODE * 10000000ULL) + SLE_API_VERSION)
+ ((LTTNG_LINUX_VERSION_CODE * 100000000ULL) + SLE_API_VERSION)
#else
#define LTTNG_SLE_VERSION_CODE 0
#endif
/* RT patch */
#define LTTNG_RT_KERNEL_VERSION(a, b, c, d) \
- (((LTTNG_KERNEL_VERSION(a, b, c)) << 8) + (d))
+ (((LTTNG_KERNEL_VERSION(a, b, c)) << 16) + (d))
#ifdef RT_PATCH_VERSION
#define LTTNG_RT_VERSION_CODE \
- ((LTTNG_LINUX_VERSION_CODE << 8) + RT_PATCH_VERSION)
+ ((LTTNG_LINUX_VERSION_CODE << 16) + RT_PATCH_VERSION)
#else
#define LTTNG_RT_VERSION_CODE 0
#endif