From 10002f5aa671de2878252aaa48f585457d39638a Mon Sep 17 00:00:00 2001
From: Sumanth Korikkar <sumanthk@linux.ibm.com>
Date: Tue, 29 Mar 2022 10:20:19 +0200
Subject: [PATCH] kpatch/s390: Add gcc prerequisite flags for kpatch

1. -mno-pic-data-is-text-relative prevents relative addressing between
   code and data. This is needed to avoid relocation error when klp text
   and data are too far apart

2. Avoid generation of LANCHOR symbols through -fno-section-anchors.
   kpatch-build does not handle it well.

Signed-off-by: Sumanth Korikkar <sumanthk@linux.ibm.com>
---
 kpatch-build/kpatch-build | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/kpatch-build/kpatch-build b/kpatch-build/kpatch-build
index 9f0fc6d..7cdae87 100755
--- a/kpatch-build/kpatch-build
+++ b/kpatch-build/kpatch-build
@@ -937,6 +937,10 @@ if [[ "$ARCH" = "ppc64le" ]]; then
 	ARCH_KCFLAGS="-mcmodel=large -fplugin=$PLUGINDIR/ppc64le-plugin.so"
 fi
 
+if [[ "$ARCH" = "s390x" ]]; then
+	ARCH_KCFLAGS="-mno-pic-data-is-text-relative -fno-section-anchors"
+fi
+
 export KCFLAGS="-I$DATADIR/patch -ffunction-sections -fdata-sections \
 		$ARCH_KCFLAGS $DEBUG_KCFLAGS"