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

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