Remove duplicated commits

[thirdparty/kernel/stable-queue.git] / releases / 4.4.133 / s390-lib-use-expoline-for-indirect-branches.patch

From foo@baz Wed May 23 19:42:20 CEST 2018
From: Martin Schwidefsky <schwidefsky@de.ibm.com>
Date: Wed, 23 May 2018 18:21:30 +0200
Subject: s390/lib: use expoline for indirect branches
To: stable@vger.kernel.org
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Message-ID: <1527092496-24207-4-git-send-email-schwidefsky@de.ibm.com>

From: Martin Schwidefsky <schwidefsky@de.ibm.com>

[ Upstream commit 97489e0663fa700d6e7febddc43b58df98d7bcda ]

The return from the memmove, memset, memcpy, __memset16, __memset32 and
__memset64 functions are done with "br %r14". These are indirect branches
as well and need to use execute trampolines for CONFIG_EXPOLINE=y.

Cc: stable@vger.kernel.org # 4.16
Fixes: f19fbd5ed6 ("s390: introduce execute-trampolines for branches")
Reviewed-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 arch/s390/lib/mem.S |    9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

--- a/arch/s390/lib/mem.S
+++ b/arch/s390/lib/mem.S
@@ -5,6 +5,9 @@
  */
 
 #include <linux/linkage.h>
+#include <asm/nospec-insn.h>
+
+	GEN_BR_THUNK %r14
 
 /*
  * memset implementation
@@ -38,7 +41,7 @@ ENTRY(memset)
 .Lmemset_clear_rest:
 	larl	%r3,.Lmemset_xc
 	ex	%r4,0(%r3)
-	br	%r14
+	BR_EX	%r14
 .Lmemset_fill:
 	stc	%r3,0(%r2)
 	cghi	%r4,1
@@ -55,7 +58,7 @@ ENTRY(memset)
 .Lmemset_fill_rest:
 	larl	%r3,.Lmemset_mvc
 	ex	%r4,0(%r3)
-	br	%r14
+	BR_EX	%r14
 .Lmemset_xc:
 	xc	0(1,%r1),0(%r1)
 .Lmemset_mvc:
@@ -77,7 +80,7 @@ ENTRY(memcpy)
 .Lmemcpy_rest:
 	larl	%r5,.Lmemcpy_mvc
 	ex	%r4,0(%r5)
-	br	%r14
+	BR_EX	%r14
 .Lmemcpy_loop:
 	mvc	0(256,%r1),0(%r3)
 	la	%r1,256(%r1)