[PATCH 3/6] x86: clean up _TIF_SYSCALL_EMU handling using ptrace_syscall_enter hook

[Andy Lutomirski]

On Thu, Feb 28, 2019 at 10:32 AM Sudeep Holla <sudeep.holla at arm.com> wrote:
>
> Now that we have a new hook ptrace_syscall_enter that can be called from
> syscall entry code and it handles PTRACE_SYSEMU in generic code, we
> can do some cleanup using the same in syscall_trace_enter.
>
> Further the extra logic to find single stepping PTRACE_SYSEMU_SINGLESTEP
> in syscall_slow_exit_work seems unnecessary. Let's remove the same.

I wasn't cc'd on the whole series, so I can't easily review this.  Do
you have a test case to make sure that emulation still works?  Are
there adequate tests in tools/testing/selftests/x86?  Do they still
pass after this patch?

--Andy