linux-kernel - Re: [PATCH -next V8 04/14] riscv: ptrace: Remove duplicate operation

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Message-ID: <CAJF2gTRqnuYVHKoB_7GCK_JwvUK0gYUs9eOAzXL-CKWQ-AuO+Q@mail.gmail.com>
Date:   Tue, 6 Dec 2022 12:41:07 +0800
From:   Guo Ren <guoren@...nel.org>
To:     Björn Töpel <bjorn@...nel.org>
Cc:     arnd@...db.de, palmer@...osinc.com, tglx@...utronix.de,
        peterz@...radead.org, luto@...nel.org, conor.dooley@...rochip.com,
        heiko@...ech.de, jszhang@...nel.org, lazyparser@...il.com,
        falcon@...ylab.org, chenhuacai@...nel.org, apatel@...tanamicro.com,
        atishp@...shpatra.org, palmer@...belt.com,
        paul.walmsley@...ive.com, mark.rutland@....com,
        zouyipeng@...wei.com, bigeasy@...utronix.de,
        David.Laight@...lab.com, chenzhongjin@...wei.com,
        greentime.hu@...ive.com, andy.chiu@...ive.com,
        linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-riscv@...ts.infradead.org,
        Guo Ren <guoren@...ux.alibaba.com>,
        Oleg Nesterov <oleg@...hat.com>
Subject: Re: [PATCH -next V8 04/14] riscv: ptrace: Remove duplicate operation

On Mon, Dec 5, 2022 at 5:34 PM Björn Töpel <bjorn@...nel.org> wrote:
>
> guoren@...nel.org writes:
>
> > From: Guo Ren <guoren@...ux.alibaba.com>
> >
> > The TIF_SYSCALL_TRACE is controlled by a common code, see
> > kernel/ptrace.c and include/linux/thread.h.
>
>                                     ^^^ thread_info.h
> >
> > clear_task_syscall_work(child, SYSCALL_TRACE);
> >
> > Signed-off-by: Guo Ren <guoren@...ux.alibaba.com>
> > Signed-off-by: Guo Ren <guoren@...nel.org>
> > Reviewed-by: Oleg Nesterov <oleg@...hat.com>
> > ---
> >  arch/riscv/kernel/ptrace.c | 1 -
> >  1 file changed, 1 deletion(-)
> >
> > diff --git a/arch/riscv/kernel/ptrace.c b/arch/riscv/kernel/ptrace.c
> > index 2ae8280ae475..44f4b1ca315d 100644
> > --- a/arch/riscv/kernel/ptrace.c
> > +++ b/arch/riscv/kernel/ptrace.c
> > @@ -212,7 +212,6 @@ unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n)
> >
> >  void ptrace_disable(struct task_struct *child)
> >  {
> > -     clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
> >  }
> >
> >  long arch_ptrace(struct task_struct *child, long request,
>
> This patch is also not neccesary for the series, but should be a
> separate cleanup.
Maybe I would deprecate this patch because the generic entry would
delete the whole ptrace_disable().



-- 
Best Regards
 Guo Ren