On Thu, Jul 23, 2015 at 9:01 AM, Steven Rostedt <[email protected]> wrote: > On Thu, 23 Jul 2015 08:31:40 -0700 > Andy Lutomirski <[email protected]> wrote: > >> Oddly, 64-bit kernels already allocate a percpu sysenter stack, but >> they don't enable it. Enable the stack and tweak the rest of the >> sysenter setup code to be similar to the 32-bit version. > > I'm curious. Did you do any investigation into the 64bit code to why it > wasn't set? Do you know if that was just overlooked with some of the > merging between i386 and x86_64 systems? > > I'm not asking you to do it if you have not, but if you have, I think > it would be more comforting to know that it was just overlooked than > there being some other subtle reason.
I think it's just that it was never necessary. #DB has always used IST on x86_64 (IIRC it was like that in the very first commit), so the sysenter stack was never actually referenced. --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/
