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s390: clean up stacks setup

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Replace hard coded stack frame overhead values with STACK_FRAME_OVERHEAD
definition. Avoid unnecessary arithmetic instructions.

Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Vasily Gorbik
2018-09-14 17:35:46 +02:00
committed by Martin Schwidefsky
parent 26f4414a45
commit 4e62d45885
5 changed files with 9 additions and 12 deletions
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6
arch/s390/kernel/head64.S
View File

@@ -14,6 +14,7 @@
#include <asm/asm-offsets.h>
#include <asm/thread_info.h>
#include <asm/page.h>
#include <asm/ptrace.h>
__HEAD
ENTRY(startup_continue)
@@ -35,10 +36,9 @@ ENTRY(startup_continue)
#
larl %r14,init_task
stg %r14,__LC_CURRENT
larl %r15,init_thread_union
aghi %r15,1<<(PAGE_SHIFT+THREAD_SIZE_ORDER) # init_task_union + THREAD_SIZE
larl %r15,init_thread_union+THREAD_SIZE
stg %r15,__LC_KERNEL_STACK # set end of kernel stack
aghi %r15,-160
aghi %r15,-STACK_FRAME_OVERHEAD
#
# Early setup functions that may not rely on an initialized bss section,
# like moving the initrd. Returns with an initialized bss section.

4
arch/s390/kernel/swsusp.S
View File

@@ -197,9 +197,7 @@ pgm_check_entry:
brc 2,3b /* busy, try again */
/* Suspend CPU not available -> panic */
larl %r15,init_thread_union
aghi %r15,1<<(PAGE_SHIFT+THREAD_SIZE_ORDER)
aghi %r15,-STACK_FRAME_OVERHEAD
larl %r15,init_thread_union+THREAD_SIZE-STACK_FRAME_OVERHEAD
larl %r2,.Lpanic_string
brasl %r14,sclp_early_printk_force
larl %r3,.Ldisabled_wait_31