Thadeu Lima de Souza Cascardo <casca...@canonical.com> writes: > For the current task, the kernel stack would only tell the last time the > process was rescheduled, if ever. Use the current stack pointer for the > current task.
You say "fix" in the subject, but is it a bug, or just an enhancement? > This is also consistent with some other architectures. Such as .. arm64 and x86 (though it's buried in the unwind code). > diff --git a/arch/powerpc/kernel/stacktrace.c > b/arch/powerpc/kernel/stacktrace.c > index 6671195..2446066 100644 > --- a/arch/powerpc/kernel/stacktrace.c > +++ b/arch/powerpc/kernel/stacktrace.c > @@ -59,7 +59,12 @@ EXPORT_SYMBOL_GPL(save_stack_trace); > > void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace) > { > - save_context_stack(trace, tsk->thread.ksp, tsk, 0); > + unsigned long sp = tsk->thread.ksp; > + > + if (tsk == current) > + sp = current_stack_pointer(); else sp = tsk->thread.ksp; Would be clearer IMHO. > + > + save_context_stack(trace, sp, tsk, 0); > } > EXPORT_SYMBOL_GPL(save_stack_trace_tsk); > > -- > 2.9.3 cheers