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s390/unwind: fix get_stack_pointer(NULL, NULL)

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unwind_for_each_frame(NULL, NULL, 0) does not return any valid frames.

The reason is that get_stack_pointer, unlike get_stack_info and
show_stack, does not handle NULL argument.

Fix by making get_stack_pointer treat NULL as current, like
get_stack_info and show_stack do.

Reviewed-by: Vasily Gorbik <gor@linux.ibm.com>
Tested-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Ilya Leoshkevich 2019-10-02 12:56:27 +02:00 committed by Vasily Gorbik
parent d3baaeb5ae
commit ea3f6dcfa7
1 changed files with 1 additions and 1 deletions
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2
arch/s390/include/asm/stacktrace.h
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@ -38,7 +38,7 @@ static inline unsigned long get_stack_pointer(struct task_struct *task,
{
if (regs)
return (unsigned long) kernel_stack_pointer(regs);
if (task == current)
if (!task || task == current)
return current_stack_pointer();
return (unsigned long) task->thread.ksp;
}