From: Vasily Gorbik <gor@linux.ibm.com>
Date: Fri, 22 Nov 2019 16:15:35 +0000 (+0100)
Subject: s390/head64: correct init_task stack setup
X-Git-Tag: v5.15~4977^2~21
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=cb7948e8c3f18f7ff0ab7d0fa1e6b108d938cdd6;p=platform%2Fkernel%2Flinux-starfive.git

s390/head64: correct init_task stack setup

Add missing allocation of pt_regs at the bottom of the stack. This
makes it consistent with other stack setup cases and also what stack
unwinder expects.

Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
---

diff --git a/arch/s390/kernel/head64.S b/arch/s390/kernel/head64.S
index b9e585f..8b88dbb 100644
--- a/arch/s390/kernel/head64.S
+++ b/arch/s390/kernel/head64.S
@@ -31,7 +31,7 @@ ENTRY(startup_continue)
 #
 	larl	%r14,init_task
 	stg	%r14,__LC_CURRENT
-	larl	%r15,init_thread_union+THREAD_SIZE-STACK_FRAME_OVERHEAD
+	larl	%r15,init_thread_union+THREAD_SIZE-STACK_FRAME_OVERHEAD-__PT_SIZE
 #ifdef CONFIG_KASAN
 	brasl	%r14,kasan_early_init
 #endif