linux-kernel - Re: [PATCH v2 1/6] ptrace: move clearing of TIF_SYSCALL

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Date:   Mon, 18 Mar 2019 18:29:11 +0100
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, linuxppc-dev@...ts.ozlabs.org,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.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>
Subject: Re: [PATCH v2 1/6] ptrace: move clearing of TIF_SYSCALL_EMU flag to
 core

On 03/18, Sudeep Holla wrote:
>
 @@ -534,6 +534,10 @@ static int ptrace_detach(struct task_struct *child, unsigned int data)
>  	/* Architecture-specific hardware disable .. */
>  	ptrace_disable(child);
>  
> +#ifdef TIF_SYSCALL_EMU
> +	clear_tsk_thread_flag(child, TIF_SYSCALL_EMU);
> +#endif

perhaps it makes sense to factor out clear_tsk_thread_flag(TIF_SYSCALL_EMU), but
then we should probably clear it along with TIF_SYSCALL_TRACE in __ptrace_unlink?

Oleg.