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s390/stack: use STACK_INIT_OFFSET where possible

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Make STACK_INIT_OFFSET also available for assembler code, and
use it everywhere instead of open-coding it at several places.

Reviewed-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Heiko Carstens
2023-03-27 11:37:22 +02:00
committed by Vasily Gorbik
parent e6badee940
commit c2c3258fb5
5 changed files with 13 additions and 17 deletions
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8
arch/s390/include/asm/thread_info.h
View File

@@ -9,6 +9,9 @@
#define _ASM_THREAD_INFO_H
#include <linux/bits.h>
#ifndef ASM_OFFSETS_C
#include <asm/asm-offsets.h>
#endif
/*
* General size of kernel stacks
@@ -21,13 +24,12 @@
#define BOOT_STACK_SIZE (PAGE_SIZE << 2)
#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
#define STACK_INIT_OFFSET (THREAD_SIZE - STACK_FRAME_OVERHEAD - __PT_SIZE)
#ifndef __ASSEMBLY__
#include <asm/lowcore.h>
#include <asm/page.h>
#define STACK_INIT_OFFSET \
(THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs))
/*
* low level task data that entry.S needs immediate access to
* - this struct should fit entirely inside of one cache line

12
arch/s390/kernel/entry.S
View File

@@ -29,10 +29,6 @@
#include <asm/export.h>
#include <asm/nospec-insn.h>
STACK_SHIFT = PAGE_SHIFT + THREAD_SIZE_ORDER
STACK_SIZE = 1 << STACK_SHIFT
STACK_INIT = STACK_SIZE - STACK_FRAME_OVERHEAD - __PT_SIZE
_LPP_OFFSET = __LC_LPP
.macro STBEAR address
@@ -53,7 +49,7 @@ _LPP_OFFSET = __LC_LPP
.macro CHECK_STACK savearea
#ifdef CONFIG_CHECK_STACK
tml %r15,STACK_SIZE - CONFIG_STACK_GUARD
tml %r15,THREAD_SIZE - CONFIG_STACK_GUARD
lghi %r14,\savearea
jz stack_overflow
#endif
@@ -62,8 +58,8 @@ _LPP_OFFSET = __LC_LPP
.macro CHECK_VMAP_STACK savearea,oklabel
#ifdef CONFIG_VMAP_STACK
lgr %r14,%r15
nill %r14,0x10000 - STACK_SIZE
oill %r14,STACK_INIT
nill %r14,0x10000 - THREAD_SIZE
oill %r14,STACK_INIT_OFFSET
clg %r14,__LC_KERNEL_STACK
je \oklabel
clg %r14,__LC_ASYNC_STACK
@@ -179,7 +175,7 @@ ENTRY(__switch_to)
stmg %r6,%r15,__SF_GPRS(%r15) # store gprs of prev task
lghi %r4,__TASK_stack
lghi %r1,__TASK_thread
llill %r5,STACK_INIT
llill %r5,STACK_INIT_OFFSET
stg %r15,__THREAD_ksp(%r1,%r2) # store kernel stack of prev
lg %r15,0(%r4,%r3) # start of kernel stack of next
agr %r15,%r5 # end of kernel stack of next

2
arch/s390/kernel/head64.S
View File

@@ -24,7 +24,7 @@ ENTRY(startup_continue)
#
larl %r14,init_task
stg %r14,__LC_CURRENT
larl %r15,init_thread_union+THREAD_SIZE-STACK_FRAME_OVERHEAD-__PT_SIZE
larl %r15,init_thread_union+STACK_INIT_OFFSET
brasl %r14,sclp_early_adjust_va # allow sclp_early_printk
brasl %r14,startup_init # s390 specific early init
brasl %r14,start_kernel # common init code

3
arch/s390/kernel/setup.c
View File

@@ -436,8 +436,7 @@ static void __init setup_lowcore(void)
lc->io_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK;
lc->io_new_psw.addr = (unsigned long) io_int_handler;
lc->clock_comparator = clock_comparator_max;
lc->nodat_stack = ((unsigned long) &init_thread_union)
+ THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
lc->nodat_stack = ((unsigned long)&init_thread_union) + STACK_INIT_OFFSET;
lc->current_task = (unsigned long)&init_task;
lc->lpp = LPP_MAGIC;
lc->machine_flags = S390_lowcore.machine_flags;

5
arch/s390/kernel/smp.c
View File

@@ -280,9 +280,8 @@ static void pcpu_attach_task(struct pcpu *pcpu, struct task_struct *tsk)
cpu = pcpu - pcpu_devices;
lc = lowcore_ptr[cpu];
lc->kernel_stack = (unsigned long) task_stack_page(tsk)
+ THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
lc->current_task = (unsigned long) tsk;
lc->kernel_stack = (unsigned long)task_stack_page(tsk) + STACK_INIT_OFFSET;
lc->current_task = (unsigned long)tsk;
lc->lpp = LPP_MAGIC;
lc->current_pid = tsk->pid;
lc->user_timer = tsk->thread.user_timer;