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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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4
arch/s390/boot/compressed/head.S
View File

@ -12,6 +12,7 @@
#include <asm/asm-offsets.h>
#include <asm/thread_info.h>
#include <asm/page.h>
#include <asm/ptrace.h>
#include "sizes.h"
__HEAD
@ -20,7 +21,6 @@ ENTRY(startup_decompressor)
.LPG1:
# setup stack
lg %r15,.Lstack-.LPG1(%r13)
aghi %r15,-160
brasl %r14,decompress_kernel
# Set up registers for memory mover. We move the decompressed image to
# 0x100000, where startup_continue of the decompressed image is supposed
@ -45,7 +45,7 @@ mover_end:
.align 8
.Lstack:
.quad 0x8000 + (1<<(PAGE_SHIFT+THREAD_SIZE_ORDER))
.quad 0x8000 + THREAD_SIZE - STACK_FRAME_OVERHEAD
.Loffset:
.quad 0x100000
.Lmvsize:

3
arch/s390/boot/head.S
View File

@ -311,7 +311,6 @@ ENTRY(startup_kdump)
spt 6f-.LPG0(%r13)
mvc __LC_LAST_UPDATE_TIMER(8),6f-.LPG0(%r13)
l %r15,.Lstack-.LPG0(%r13)
ahi %r15,-STACK_FRAME_OVERHEAD
brasl %r14,verify_facilities
#ifdef CONFIG_KERNEL_UNCOMPRESSED
jg startup_continue
@ -320,7 +319,7 @@ ENTRY(startup_kdump)
#endif
.Lstack:
.long 0x8000 + (1<<(PAGE_SHIFT+THREAD_SIZE_ORDER))
.long 0x8000 + THREAD_SIZE - STACK_FRAME_OVERHEAD
.align 8
6: .long 0x7fffffff,0xffffffff

6
arch/s390/kernel/head64.S
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@ -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
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@ -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

4
arch/s390/purgatory/head.S
View File

@ -11,6 +11,7 @@
#include <asm/asm-offsets.h>
#include <asm/page.h>
#include <asm/sigp.h>
#include <asm/ptrace.h>
/* The purgatory is the code running between two kernels. It's main purpose
* is to verify that the next kernel was not corrupted after load and to
@ -88,8 +89,7 @@ ENTRY(purgatory_start)
.base_crash:
/* Setup stack */
larl %r15,purgatory_end
aghi %r15,-160
larl %r15,purgatory_end-STACK_FRAME_OVERHEAD
/* If the next kernel is KEXEC_TYPE_CRASH the purgatory is called
* directly with a flag passed in %r2 whether the purgatory shall do