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s390: add current_stack_pointer() helper function

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Implement current_stack_pointer() helper function and use it
everywhere, instead of having several different inline assembly
variants.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Tested-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens
2016-01-31 17:06:16 +01:00
committed by Martin Schwidefsky
parent 77ec8a5451
commit 76737ce17a
4 changed files with 20 additions and 16 deletions
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16
arch/s390/kernel/dumpstack.c
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@@ -67,12 +67,11 @@ static void show_trace(struct task_struct *task, unsigned long *stack)
{
const unsigned long frame_size =
STACK_FRAME_OVERHEAD + sizeof(struct pt_regs);
register unsigned long __r15 asm ("15");
unsigned long sp;
sp = (unsigned long) stack;
if (!sp)
sp = task ? task->thread.ksp : __r15;
sp = task ? task->thread.ksp : current_stack_pointer();
printk("Call Trace:\n");
#ifdef CONFIG_CHECK_STACK
sp = __show_trace(sp,
@@ -95,15 +94,16 @@ static void show_trace(struct task_struct *task, unsigned long *stack)
void show_stack(struct task_struct *task, unsigned long *sp)
{
register unsigned long *__r15 asm ("15");
unsigned long *stack;
int i;
if (!sp)
stack = task ? (unsigned long *) task->thread.ksp : __r15;
else
stack = sp;
stack = sp;
if (!stack) {
if (!task)
stack = (unsigned long *)current_stack_pointer();
else
stack = (unsigned long *)task->thread.ksp;
}
for (i = 0; i < 20; i++) {
if (((addr_t) stack & (THREAD_SIZE-1)) == 0)
break;