From c58d92b233a41b81fbbea6add4ba1b512784f837 Mon Sep 17 00:00:00 2001 From: Heiko Carstens Date: Thu, 25 Dec 2008 13:39:21 +0100 Subject: [PATCH] [S390] Remove initial kernel stack backchain initialization. Early init code clears the backchain of the initial kernel stack frame. This is not necessary since it is pre initialized with zeros. Plus it was broken on 64 bit since it cleared only four of eight bytes. Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky --- arch/s390/kernel/head31.S | 1 - arch/s390/kernel/head64.S | 1 - 2 files changed, 2 deletions(-) diff --git a/arch/s390/kernel/head31.S b/arch/s390/kernel/head31.S index 7add8454773..db476d114ca 100644 --- a/arch/s390/kernel/head31.S +++ b/arch/s390/kernel/head31.S @@ -29,7 +29,6 @@ startup_continue: ahi %r15,1<<(PAGE_SHIFT+THREAD_ORDER) # init_task_union+THREAD_SIZE st %r15,__LC_KERNEL_STACK # set end of kernel stack ahi %r15,-96 - xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # clear backchain # # Save ipl parameters, clear bss memory, initialize storage key for kernel pages, # and create a kernel NSS if the SAVESYS= parm is defined diff --git a/arch/s390/kernel/head64.S b/arch/s390/kernel/head64.S index b1a8ceb522b..3ccd36b24b8 100644 --- a/arch/s390/kernel/head64.S +++ b/arch/s390/kernel/head64.S @@ -96,7 +96,6 @@ startup_continue: aghi %r15,1<<(PAGE_SHIFT+THREAD_ORDER) # init_task_union + THREAD_SIZE stg %r15,__LC_KERNEL_STACK # set end of kernel stack aghi %r15,-160 - xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # clear backchain # # Save ipl parameters, clear bss memory, initialize storage key for kernel pages, # and create a kernel NSS if the SAVESYS= parm is defined -- 2.41.1