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 (file)
--- 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