Document last supported kernel version for stable-2.11 branch

[lttng-modules.git] / lttng-kernel-version.h

diff --git a/lttng-kernel-version.h b/lttng-kernel-version.h
index ec2f084d6b34d610db44c5ba4f870b1477daeb98..d23578357839777e402777bd3f186fc631e14862 100644 (file)
--- a/lttng-kernel-version.h
+++ b/lttng-kernel-version.h
@@ -39,19 +39,22 @@
  * 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))
+       ((((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)
-#define LTTNG_LINUX_VERSION_CODE LINUX_VERSION_CODE
+#define LTTNG_KERNEL_VERSION(a, b, c) (KERNEL_VERSION(a, b, c) * 1ULL)
+#define LTTNG_LINUX_VERSION_CODE (LINUX_VERSION_CODE * 1ULL)
 
 #endif
 
@@ -108,13 +111,13 @@
                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
@@ -129,11 +132,11 @@
 /* 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
@@ -167,11 +170,11 @@
 /* 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