datapath: compat: Fix compilation issue with grsecurity patch

Grsecurity patch enables GCC's constify plugin so that it will automatically constify a class of type that contains only function pointers. However, if the type is also specified by __read_mostly, it will put the constify object into the read_mostly section that results in compilation error. This patch works around the compilation issue by disabling __ready_mostly when grsecurity patch is applied. Tested with 4.14.33 kernel with grsecurity patch. Signed-off-by: Yi-Hung Wei <[email protected]> Signed-off-by: Ben Pfaff <[email protected]> Tested-by: Greg Rose <[email protected]> Reviewed-by: Greg Rose <[email protected]>
hzhou8 · Oct 15, 2018 · 1556fcc · 1556fcc
1 parent e670355
commit 1556fcc
Showing 1 changed file with 7 additions and 0 deletions.
diff --git a/datapath/compat.h b/datapath/compat.h
@@ -28,6 +28,13 @@
 #include <net/netfilter/ipv6/nf_defrag_ipv6.h>
 #include <net/netfilter/nf_conntrack_count.h>
 
+/* Fix grsecurity patch compilation issue. */
+#ifdef CONSTIFY_PLUGIN
+#include <linux/cache.h>
+#undef __read_mostly
+#define __read_mostly
+#endif
+
 /* Even though vanilla 3.10 kernel has grp->id, RHEL 7 kernel is missing
  * this field. */
 #ifdef HAVE_GENL_MULTICAST_GROUP_WITH_ID