From 146448524bddbf6dfc62de31957e428de001cbda Mon Sep 17 00:00:00 2001
From: Ilya Leoshkevich <iii@linux.ibm.com>
Date: Wed, 6 Feb 2019 12:35:58 +0100
Subject: [PATCH] s390/jump_label: Use "jdd" constraint on gcc9

References: bsc#1138589
Patch-mainline: v5.1-rc1
Git-commit: 146448524bddbf6dfc62de31957e428de001cbda

[heiko.carstens@de.ibm.com]:
-----
Laura Abbott reported that the kernel doesn't build anymore with gcc 9,
due to the "X" constraint. Ilya provided the gcc 9 patch "S/390:
Introduce jdd constraint" which introduces the new "jdd" constraint
which fixes this.
-----

The support for section anchors on S/390 introduced in gcc9 has changed
the behavior of "X" constraint, which can now produce register
references. Since existing constraints, in particular, "i", do not fit
the intended use case on S/390, the new machine-specific "jdd"
constraint was introduced. This patch makes jump labels use "jdd"
constraint when building with gcc9.

Reported-by: Laura Abbott <labbott@redhat.com>
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Acked-by: Michal Suchanek <msuchanek@suse.de>
---
 arch/s390/include/asm/jump_label.h | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

--- a/arch/s390/include/asm/jump_label.h
+++ b/arch/s390/include/asm/jump_label.h
@@ -9,6 +9,12 @@
 #define JUMP_LABEL_NOP_SIZE 6
 #define JUMP_LABEL_NOP_OFFSET 2
 
+#if __GNUC__ < 9
+#define JUMP_LABEL_STATIC_KEY_CONSTRAINT "X"
+#else
+#define JUMP_LABEL_STATIC_KEY_CONSTRAINT "jdd"
+#endif
+
 /*
  * We use a brcl 0,2 instruction for jump labels at compile time so it
  * can be easily distinguished from a hotpatch generated instruction.
@@ -18,9 +24,9 @@ static __always_inline bool arch_static_
 	asm_volatile_goto("0:	brcl 0,"__stringify(JUMP_LABEL_NOP_OFFSET)"\n"
 		".pushsection __jump_table, \"aw\"\n"
 		".balign 8\n"
-		".quad 0b, %l[label], %0\n"
+		".quad 0b, %l[label], %0+%1\n"
 		".popsection\n"
-		: : "X" (&((char *)key)[branch]) : : label);
+		: : JUMP_LABEL_STATIC_KEY_CONSTRAINT (key),  "i" (branch) : : label);
 
 	return false;
 label:
@@ -32,9 +38,9 @@ static __always_inline bool arch_static_
 	asm_volatile_goto("0:	brcl 15, %l[label]\n"
 		".pushsection __jump_table, \"aw\"\n"
 		".balign 8\n"
-		".quad 0b, %l[label], %0\n"
+		".quad 0b, %l[label], %0+%1\n"
 		".popsection\n"
-		: : "X" (&((char *)key)[branch]) : : label);
+		: : JUMP_LABEL_STATIC_KEY_CONSTRAINT (key), "i" (branch) : : label);
 
 	return false;
 label: