On Thu, Feb 28, 2019 at 10:32 AM Sudeep Holla [off-list ref] 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