> > >  
> > yes, this is an option. But for safety, I sugguest do not rely on 
> > list_del_init.
> > No rule rather than create one.
> > 
> > But anyway, both are ok for me. What's your options?
> 
> hum, also I dont think we need to touch that bit at all
> if we are going to remove it right away.. how about the
> change below?
> 
> jirka
> 
> 
> ---
> diff --git a/tools/perf/ui/hist.c b/tools/perf/ui/hist.c
> index 5d632dca672a..0ee7db43dd7d 100644
> --- a/tools/perf/ui/hist.c
> +++ b/tools/perf/ui/hist.c
> @@ -613,15 +613,15 @@ void perf_hpp__reset_output_field(struct perf_hpp_list 
> *list)
>  
>       /* reset output fields */
>       perf_hpp_list__for_each_format_safe(list, fmt, tmp) {
> -             list_del_init(&fmt->list);
> -             list_del_init(&fmt->sort_list);
> +             list_del(&fmt->list);
> +             /* Remove the fmt from next loop processing. */
> +             list_del(&fmt->sort_list);
>               fmt_free(fmt);
What if the fmt is not linked to sort_list? I see it is possible (please
checking perf_hpp__setup_output_field()). I am not sure if we really has
sunch case currently, just concern :)

>       }
>  
>       /* reset sort keys */
>       perf_hpp_list__for_each_sort_list_safe(list, fmt, tmp) {
> -             list_del_init(&fmt->list);
> -             list_del_init(&fmt->sort_list);
> +             list_del(&fmt->sort_list);
>               fmt_free(fmt);
>       }
>  }

-- 
Thanks,
Changbin Du

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