Hi, ----- Original Message ----- > From: "Jason Wessel" <[email protected]> > To: "Andrei Warkentin" <[email protected]> > Cc: [email protected], [email protected], "Andrei Warkentin" > <[email protected]>, > [email protected], "Matt Mackall" <[email protected]>, > "Andrei Warkentin" > <[email protected]> > Sent: Tuesday, February 28, 2012 11:06:44 AM > Subject: Re: [PATCHv3 1/3] NETPOLL: Extend rx_hook support. >
> > All that netpoll_poll() did was to call netpoll_poll_dev(). I have > not yet looked at the differences between kgdboe and the netkdb code > you proposed but I would have suspected it also falls victim to the > ethernet preemption problem which prevented kgdboe from ever being > considered for a mainline merge. Certainly there are ways to fix > this > problem but most involved changes to scheduling, core net code, or > substantial driver specific changes. > I see, I read up on the issues w.r.t. preemption. Could this be worked around by modifiying affected drivers to bypass locking if they are used in KDB context? Make some accessor netdev-specific lock/unlocks that won't do anything if running in KDB context. > > > > > This is slight OT, but...are WiFi drivers sufficiently similar that > > netpoll "just works?" > > Yes and no. Yes, you could use the NET_POLL api to transmit packets > if the driver implemented polling hooks, but no in the sense that > most > of the time you need a user space driver to manage the keys which are > time sensitive for things like WPA (usually the job of wpa > supplicant). This is going to prevent you from having WiFi work at > all while the kernel is in the critical exception state. > Ah right. I was thinking just open networking. I should give that a try... A ------------------------------------------------------------------------------ Keep Your Developer Skills Current with LearnDevNow! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-d2d _______________________________________________ Kgdb-bugreport mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/kgdb-bugreport
