On Fri, Apr 10, 2015 at 4:05 PM, Andi Kleen <[email protected]> wrote: >> One might argue that this code serves no purpose, but it's there, so >> we had better keep our per-invocation usage of DEBUG_STACK within 4k. > > Only if you run NKLD. I doubt KDB or GDB support nesting. > We can ask Jan if he still uses it.
You can trigger these things in various ways with kprobes, single-stepping, and user-space watchpoints. These things can definitely nest in interesting ways. Whether or not the IST shift mechanism is involved if they nest is a complicated question, because there's also the "debug" IDT in play. OMG this code is overcomplicated. --Andy -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
