On 07 May 14 11:17, Will Deacon wrote: > On Wed, May 07, 2014 at 12:32:29AM +0100, Larry Bassel wrote: > > Make calls to ct_user_enter when the kernel is exited > > and ct_user_exit when the kernel is entered (in el0_da, > > el0_ia, el0_svc, el0_irq). > > Why only these entry points? I can reschedule after any exception from EL0, > so I'd expect all exceptions from userspace to need annotating, no? > > > These macros expand to function calls which will only work > > properly if el0_sync and related code has been rearranged > > (in a previous patch of this series). > > > > In order to avoid saving registers, the slow syscall path > > is forced (as x86 does). > > ... and if you decide to handle undef exceptions, I think you'll need > the register saving too, in case the kernel needs to perform emulation.
These are excellent points, I will rework the patch and submit v3. Thanks for the feedback. > > Will Larry -- 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/
