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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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9
arch/s390/kernel/stacktrace.c
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@@ -77,10 +77,9 @@ static void __save_stack_trace(struct stack_trace *trace, unsigned long sp)
void save_stack_trace(struct stack_trace *trace)
{
register unsigned long r15 asm ("15");
unsigned long sp;
sp = r15;
sp = current_stack_pointer();
__save_stack_trace(trace, sp);
if (trace->nr_entries < trace->max_entries)
trace->entries[trace->nr_entries++] = ULONG_MAX;
@@ -92,10 +91,8 @@ void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
unsigned long sp, low, high;
sp = tsk->thread.ksp;
if (tsk == current) {
/* Get current stack pointer. */
asm volatile("la %0,0(15)" : "=a" (sp));
}
if (tsk == current)
sp = current_stack_pointer();
low = (unsigned long) task_stack_page(tsk);
high = (unsigned long) task_pt_regs(tsk);
save_context_stack(trace, sp, low, high, 1);