Re: [PATCH v2 1/2] arm64: Implement arch_stack_walk_reliable

[Song Liu]

On Wed, Mar 19, 2025 at 3:35 PM Josh Poimboeuf <jpoimboe@xxxxxxxxxx> wrote:
>
> On Wed, Mar 19, 2025 at 02:37:06PM -0700, Song Liu wrote:
> > +noinline noinstr int arch_stack_walk_reliable(stack_trace_consume_fn consume_entry,
> > +                     void *cookie, struct task_struct *task)
> > +{
> > +     struct kunwind_consume_entry_data data = {
> > +             .consume_entry = consume_entry,
> > +             .cookie = cookie,
> > +     };
> > +     int ret;
> > +
> > +     ret = kunwind_stack_walk(arch_kunwind_consume_entry, &data, task, NULL, true);
> > +     if (ret == -ENOENT)
> > +             ret = 0;
>
> Is this check redundant with the -ENOENT check in do_kunwind() which
> already converts ret to zero?

Indeed. This check is redundant.

Thanks,
Song