From 1b34e43109b8b48516fc07c63b201bbb3e53a295 Mon Sep 17 00:00:00 2001
From: John Sully <john@csquare.ca>
Date: Tue, 19 Mar 2019 18:55:42 -0400
Subject: [PATCH] Feature gate SO_INCOMING_CPU so we compile on older kernels

Former-commit-id: 267e84f97d61f8aa416f88870c21bdf2a0cc635a
---
 src/fmacros.h      | 5 +++++
 src/networking.cpp | 2 ++
 2 files changed, 7 insertions(+)

diff --git a/src/fmacros.h b/src/fmacros.h
index a56bb9331..ea663e1a3 100644
--- a/src/fmacros.h
+++ b/src/fmacros.h
@@ -35,7 +35,12 @@
 #if defined(__linux__)
 #define _GNU_SOURCE 1
 #define _DEFAULT_SOURCE 1
+
+#include <linux/version.h>
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,19,0)
+#define HAVE_SO_INCOMING_CPU 1
 #endif
+#endif  // __linux__
 
 #if defined(_AIX)
 #define _ALL_SOURCE
diff --git a/src/networking.cpp b/src/networking.cpp
index b608370fb..4a6794d98 100644
--- a/src/networking.cpp
+++ b/src/networking.cpp
@@ -1035,6 +1035,7 @@ static void acceptCommonHandler(int fd, int flags, char *ip, int iel) {
         return;
     }
 
+#ifdef HAVE_SO_INCOMING_CPU
     // Set thread affinity
     if (server.fThreadAffinity)
     {
@@ -1044,6 +1045,7 @@ static void acceptCommonHandler(int fd, int flags, char *ip, int iel) {
             serverLog(LL_WARNING, "Failed to set socket affinity");
         }
     }
+#endif
 
     /* If maxclient directive is set and this is one client more... close the
      * connection. Note that we create the client instead to check before