On Mon, 10 Sep 2012 10:57:04 -0700 Anton Vorontsov <anton.vorontsov@xxxxxxxxxx> wrote: > On Mon, Sep 10, 2012 at 12:16:24PM +0100, Alan Cox wrote: > > > serial port, the CPU receives NMI exception, and we fall into KDB > > > shell. So, it is our "debug console", and it is able to interrupt > > > (and thus debug) even IRQ handlers themselves. > > > > You seem to have an assumption of single core here. What happens if > > the NMI hits CPU #0 and the serial IRQ hits CPU #1 simultaneously ? > > If you can't redirect all serial IRQs to NMI context, e.g. sometimes you get > NMIs, sometimes IRQs, then your NMI handling is not deterministic, and surely > this is not supported. This seems like arch specific magic leaking into the tty code. Surely this should be buried in the depths of the platform IRQ code ? Alan -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
