!! is generally used to make the return bool value. You can use kernelnewbies and linux kernel mailing list.
On Mon, Apr 1, 2013 at 12:43 PM, Ben Wu <[email protected]> wrote: > > > Dear All： > 1> I found some placeuse two "!!", what's means > if(button->gpio != INVALID_GPIO) > state = !!((gpio_get_value(button->gpio) ? 1 : 0) ^ > button->active_low); > else > state = !!button->adc_state; > > 2> is there some MSN group to study linux kernel or discuss it ? > > Thanks and Best Regards > Ben Wu > MSN:[email protected] > > > _______________________________________________ > Kernelnewbies mailing list > [email protected] > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > >
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