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

From: Sudeep Holla
Date: Mon Mar 04 2019 - 05:08:04 EST

On Sat, Mar 02, 2019 at 05:11:40PM -0800, Andy Lutomirski wrote:
> On Thu, Feb 28, 2019 at 10:32 AM Sudeep Holla <sudeep.holla@xxxxxxx> 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?

I will ensure you are cc-ed on the whole threads, sorry for missing.
I remember seeing some selftests, but I haven't run them yet.