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

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Message-ID: <20190502161329.GE7323@redhat.com>
Date:   Thu, 2 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 05/01, Sudeep Holla wrote:
>
> On Wed, May 01, 2019 at 06:13:30PM +0200, Oleg Nesterov wrote:
> > 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>
> >
>
> Since 1/4 and 2/4 are completely independent of arm64 changes in 3&4/4,
> I prefer you take these via your tree.

Sorry Sudeep, I can't do this, I need to reanimate my account on kernel.org.

Oleg.