On Mon, Oct 3, 2011 at 15:35, Wei Yang <weiyang.kernel@xxxxxxxxx> wrote:
> 2011/10/3 Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
>> On Mon, Oct 3, 2011 at 12:24, KAMEZAWA Hiroyuki
>> <kamezawa.hiroyu@xxxxxxxxxxxxxx> wrote:
>> > On Sun, 2 Oct 2011 21:57:07 +0800
>> > Wei Yang <weiyang.kernel@xxxxxxxxx> wrote:
>> >
>> >> Dear experts,
>> >>
>> >> I am viewing the source code of __release_region() in
>> >> kernel/resource.c.
>> >> And I have one comment for the performance issue.
>> >>
>> >> For example, we have a resource tree like this.
>> >> 10-89
>> >> 20-79
>> >> 30-49
>> >> 55-59
>> >> 60-64
>> >> 65-69
>> >> 80-89
>> >> 100-279
>> >>
>> >> If the caller wants to release a region of [50,59], the original code
>> >> will
>> ^^^^^^^
>> Do you really mean [50,59]?
>
> Yes.
>>
>> I don't think that's allowed, as the tree has [55,59], so you would
>> release a
>> larger region that allocated.
>
> So you mean the case I mentioned will not happen?
Indeed, it should not happen.
Actually I'm surprised it doesn't return an error code.
> Actually, I believe every developer should pass the resource region which
> has been allocated.
> While if some one made a mistake and pass a region which is not allocated
> before and overlap
> some "BUSY" region?
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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