linux-kernel - Re: [PATCH 4/9] ptrace/xtensa: Replace PT_SINGLESTEP with TIF

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Date:   Tue, 26 Apr 2022 16:33:24 -0700
From:   Max Filippov <jcmvbkbc@...il.com>
To:     "Eric W. Biederman" <ebiederm@...ssion.com>
Cc:     LKML <linux-kernel@...r.kernel.org>, rjw@...ysocki.net,
        Oleg Nesterov <oleg@...hat.com>,
        Ingo Molnar <mingo@...nel.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        dietmar.eggemann@....com, Steven Rostedt <rostedt@...dmis.org>,
        mgorman@...e.de, Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Will Deacon <will@...nel.org>, Tejun Heo <tj@...nel.org>,
        linux-pm@...r.kernel.org, Peter Zijlstra <peterz@...radead.org>,
        Richard Weinberger <richard@....at>,
        Anton Ivanov <anton.ivanov@...bridgegreys.com>,
        Johannes Berg <johannes@...solutions.net>,
        linux-um@...ts.infradead.org, Chris Zankel <chris@...kel.net>,
        inux-xtensa@...ux-xtensa.org, Kees Cook <keescook@...omium.org>,
        Jann Horn <jannh@...gle.com>
Subject: Re: [PATCH 4/9] ptrace/xtensa: Replace PT_SINGLESTEP with TIF_SINGLESTEP

On Tue, Apr 26, 2022 at 3:52 PM Eric W. Biederman <ebiederm@...ssion.com> wrote:
>
> xtensa is the last user of the PT_SINGLESTEP flag.  Changing tsk->ptrace in
> user_enable_single_step and user_disable_single_step without locking could
> potentiallly cause problems.
>
> So use a thread info flag instead of a flag in tsk->ptrace.  Use TIF_SINGLESTEP
> that xtensa already had defined but unused.
>
> Remove the definitions of PT_SINGLESTEP and PT_BLOCKSTEP as they have no more users.
>
> Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
> ---
>  arch/xtensa/kernel/ptrace.c | 4 ++--
>  arch/xtensa/kernel/signal.c | 4 ++--
>  include/linux/ptrace.h      | 6 ------
>  3 files changed, 4 insertions(+), 10 deletions(-)

Acked-by: Max Filippov <jcmvbkbc@...il.com>

-- 
Thanks.
-- Max