Hi Larry,
On Mon, May 26, 2014 at 07:56:13PM +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.
Apologies if we've discussed this before (it rings a bell), but why are we penalising the fast syscall path with this? Shouldn't TIF_NOHZ contribute to out _TIF_WORK_MASK, then we could do the tracking on the syscall slow path?
I think that would tidy up your mov into x19 too.
Also -- how do you track ret_from_fork in the child with these patches?
Will