linux-kernel - Re: [PATCH v3 1/4] ptrace: move clearing of TIF_SYSCALL

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Date:   Wed, 1 May 2019 18:13:30 +0200
From:   Oleg Nesterov <oleg@...hat.com>
To:     Sudeep Holla <sudeep.holla@....com>
Cc:     x86@...nel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Richard Weinberger <richard@....at>, jdike@...toit.com,
        Steve Capper <Steve.Capper@....com>,
        Haibo Xu <haibo.xu@....com>, Bin Lu <bin.lu@....com>,
        Andy Lutomirski <luto@...nel.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH v3 1/4] ptrace: move clearing of TIF_SYSCALL_EMU flag to
 core

On 04/30, Sudeep Holla wrote:
>
> While the TIF_SYSCALL_EMU is set in ptrace_resume independent of any
> architecture, currently only powerpc and x86 unset the TIF_SYSCALL_EMU
> flag in ptrace_disable which gets called from ptrace_detach.
>
> Let's move the clearing of TIF_SYSCALL_EMU flag to __ptrace_unlink
> which gets executed from ptrace_detach and also keep it along with
> or close to clearing of TIF_SYSCALL_TRACE.
>
> Cc: Oleg Nesterov <oleg@...hat.com>
> Cc: Paul Mackerras <paulus@...ba.org>
> Cc: Michael Ellerman <mpe@...erman.id.au>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Ingo Molnar <mingo@...hat.com>
> Signed-off-by: Sudeep Holla <sudeep.holla@....com>

Acked-by: Oleg Nesterov <oleg@...hat.com>