[PATCH] compat: support building for RHEL-8.2

[Ilie Halip]

RedHat backported some more changes, now released as kernel 4.18.0-168.el8.
To maintain compatibility with kernel -147, a new macro is introduced: ISRHEL82.

Compile-tested with the -168 and -147 kernels.

Signed-off-by: Ilie Halip <ilie.halip at gmail.com>
---
 src/compat/compat.h | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/src/compat/compat.h b/src/compat/compat.h
index 96f3556..a77f973 100644
--- a/src/compat/compat.h
+++ b/src/compat/compat.h
@@ -16,6 +16,11 @@
 #define ISRHEL7
 #elif RHEL_MAJOR == 8
 #define ISRHEL8
+#ifdef RHEL_MINOR
+#if RHEL_MINOR == 2
+#define ISRHEL82
+#endif
+#endif
 #endif
 #endif
 #ifdef UTS_UBUNTU_RELEASE_ABI
@@ -783,7 +788,7 @@ struct __kernel_timespec {
 #endif
 #endif
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 1, 0)
+#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 1, 0) && !defined(ISRHEL82)
 #include <linux/skbuff.h>
 #define skb_probe_transport_header(a) skb_probe_transport_header(a, 0)
 #endif
@@ -792,7 +797,7 @@ struct __kernel_timespec {
 #define ignore_df local_df
 #endif
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 1, 0)
+#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 1, 0) && !defined(ISRHEL82)
 /* Note that all intentional uses of the non-_bh variety need to explicitly
  * undef these, conditionalized on COMPAT_CANNOT_DEPRECIATE_BH_RCU.
  */
@@ -834,7 +839,7 @@ static inline void skb_mark_not_on_list(struct sk_buff *skb)
 #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 20, 0) && !defined(ISRHEL8)
 #define NLA_EXACT_LEN NLA_UNSPEC
 #endif
-#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 2, 0)
+#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 2, 0) && !defined(ISRHEL82)
 #define NLA_MIN_LEN NLA_UNSPEC
 #define COMPAT_CANNOT_INDIVIDUAL_NETLINK_OPS_POLICY
 #endif
-- 
2.17.1