On Mon, Feb 15, 2021 at 1:25 AM Leon Romanovsky <leon@xxxxxxxxxx> wrote: > > > + /* When transmitting data: > > + * first we'll remove a pseudo header of 1 byte, > > + * then the LAPB module will prepend an LAPB header of at most 3 bytes. > > + */ > > + dev->needed_headroom = 3 - 1; > > 3 - 1 = 2 > > Thanks Actually this is intentional. It makes the numbers more meaningful. The compiler should automatically generate the "2" so there would be no runtime penalty.
