Re: [PATCH 4/6] powerpc: use common ptrace_syscall_enter hook to handle _TIF_SYSCALL_EMU

Sudeep Holla
2019-03-04T10:42:17Z

On Mon, Mar 04, 2019 at 09:36:27AM +0000, Haibo Xu (Arm Technology China) wrote:
> On 2019/3/1 2:32, Sudeep Holla 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 do_syscall_trace_enter.
> >
> > Cc: Oleg Nesterov <oleg@redhat.com>
> > Cc: Paul Mackerras <paulus@samba.org>
> > Cc: Michael Ellerman <mpe@ellerman.id.au>
> > Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
> > ---
> > arch/powerpc/kernel/ptrace.c | 50 ++++++++++++++++--------------------
> > 1 file changed, 22 insertions(+), 28 deletions(-)
> >
> > diff --git a/arch/powerpc/kernel/ptrace.c b/arch/powerpc/kernel/ptrace.c
> > index cb7e1439cafb..978cd2aac29e 100644
> > --- a/arch/powerpc/kernel/ptrace.c
> > +++ b/arch/powerpc/kernel/ptrace.c
> > @@ -3264,37 +3264,31 @@ long do_syscall_trace_enter(struct pt_regs *regs)
> > {
> > u32 flags;
> >
> > - user_exit();
>
> We'd better keep the user_exit() at here in case both context tracking and
> SYSCALL_EMU are enabled.
>

Ah right, spurious change will fix it.

--
Regards,
Sudeep