From: Sven Schnelle <svens@linux.ibm.com>
Date: Wed, 3 Feb 2021 16:46:12 +0000 (+0100)
Subject: s390: use r13 in cleanup_sie as temp register
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=33ea04872da15ea8236f92da6009af5a1b0af641;p=linux.git

s390: use r13 in cleanup_sie as temp register

Instead of thrashing r11 which is normally our pointer to struct
pt_regs on the stack, use r13 as temporary register in the BR_EX
macro. r13 is already used in cleanup_sie, so no need to thrash
another register.

Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
---

diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S
index 3772949699544..d1236a9f73b24 100644
--- a/arch/s390/kernel/entry.S
+++ b/arch/s390/kernel/entry.S
@@ -130,7 +130,7 @@ _LPP_OFFSET	= __LC_LPP
 	.endm
 
 	GEN_BR_THUNK %r14
-	GEN_BR_THUNK %r14,%r11
+	GEN_BR_THUNK %r14,%r13
 
 	.section .kprobes.text, "ax"
 .Ldummy:
@@ -665,7 +665,7 @@ ENDPROC(stack_overflow)
 	ni	__SIE_PROG0C+3(%r9),0xfe	# no longer in SIE
 	lctlg	%c1,%c1,__LC_KERNEL_ASCE
 	larl	%r9,sie_exit			# skip forward to sie_exit
-	BR_EX	%r14,%r11
+	BR_EX	%r14,%r13
 
 #endif
 	.section .rodata, "a"