netdev - RE: [tcpdump-workers] Modular arithmetic

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Date:	Mon, 10 Sep 2012 09:41:02 +0100
From:	"David Laight" <David.Laight@...LAB.COM>
To:	"Andi Kleen" <ak@...ux.intel.com>,
	"George Bakos" <gbakos@...inista.org>,
	<tcpdump-workers@...ts.tcpdump.org>
Cc:	"Jay Schulist" <jschlst@...ba.org>, <netdev@...r.kernel.org>
Subject: RE: [tcpdump-workers] Modular arithmetic

> On Fri, Sep 07, 2012 at 07:49:10AM +0000, George Bakos wrote:
> > Gents,
> > Any fundamental reason why the following (, etc.) shouldn't be
> > included in net/core/filter.c?
> >
> >                 case BPF_S_ALU_MOD_X:
> >                         if (X == 0)
> >                                 return 0;
> >                         A %= X;
> >                         continue;
> 
> Copying netdev.
> 
> In principle no reason against it, but you may need to update
> the various BPF JITs too that Linux now has too.

What about the other OS - eg all the BSDs?
I had a vague idea that BPF was supposed to be reasonable portable.

	David    (dsl@...bsd.org)




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