Messages in this thread | | | From | Xie He <> | Date | Mon, 15 Feb 2021 09:23:32 -0800 | Subject | Re: [PATCH net-next RFC v3] net: hdlc_x25: Queue outgoing LAPB frames |
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On Mon, Feb 15, 2021 at 1:25 AM Leon Romanovsky <leon@kernel.org> 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.
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