On Thu, May 29, 2014 at 10:45:04PM +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 and all of the "error" paths). > > 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). > > The calls to ct_user_exit are made after hw debugging has been > enabled (enable_dbg_and_irq). > > The call to ct_user_enter is made at the beginning of the > kernel_exit macro. > > This patch is based on earlier work by Kevin Hilman. > Save/restore optimizations were also done by Kevin.
Apparently I'm feeling pedantic today, one minor comment below... > diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S > index b0101b9..3c484e2 100644 > --- a/arch/arm64/kernel/entry.S > +++ b/arch/arm64/kernel/entry.S > @@ -30,6 +30,32 @@ > #include <asm/unistd32.h> > > /* > + * Context tracking subsystem. Used to instrument transitions > + * between user and kernel mode. > + */ > + .macro ct_user_exit, restore = 0 > +#ifdef CONFIG_CONTEXT_TRACKING > + bl context_tracking_user_exit > + .if \restore == 1 ... I know we already changed this argument from \save, but maybe just naming it \syscall makes most sense now? If you make that change: Acked-by: Will Deacon <will.dea...@arm.com> I'd like to give these some stress testing before it gets merged, so I'm not sure if it'll make it for 3.16 given where we are at the moment. Will -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
