[Linux-stm32] [Intel-wired-lan] [PATCH net-next 1/2] stmmac: xsk: fix underflow of budget in zerocopy mode

[Willem de Bruijn]

Jason Xing wrote:
> Hi Paul,
> 
> On Mon, Jul 21, 2025 at 4:56 PM Paul Menzel <pmenzel at molgen.mpg.de> wrote:
> >
> > Dear Jason,
> >
> >
> > Thank you for your patch.
> 
> Thanks for your quick response and review :)
> 
> >
> > Am 21.07.25 um 10:33 schrieb Jason Xing:
> > > From: Jason Xing <kernelxing at tencent.com>
> > >
> > > The issue can happen when the budget number of descs are consumed. As
> >
> > Instead of “The issue”, I’d use “An underflow …”.
> 
> Will change it.
> 
> >
> > > long as the budget is decreased to zero, it will again go into
> > > while (budget-- > 0) statement and get decreased by one, so the
> > > underflow issue can happen. It will lead to returning true whereas the
> > > expected value should be false.
> >
> > What is “it”?
> 
> It means 'underflow of budget' behavior.

A technicality, but this is (negative) overflow.

Underflow is a computation that results in a value that is too small
to be represented by the given type.