linux-kernel - Re: [RESEND PATCH v2 1/2] ftrace: disable preemption between ftrace_test_recursion

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Date:   Wed, 13 Oct 2021 10:24:15 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     王贇 <yun.wang@...ux.alibaba.com>
Cc:     Miroslav Benes <mbenes@...e.cz>, Guo Ren <guoren@...nel.org>,
        Ingo Molnar <mingo@...hat.com>,
        "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
        Helge Deller <deller@....de>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Jiri Kosina <jikos@...nel.org>, Petr Mladek <pmladek@...e.com>,
        Joe Lawrence <joe.lawrence@...hat.com>,
        Colin Ian King <colin.king@...onical.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Nicholas Piggin <npiggin@...il.com>,
        Jisheng Zhang <jszhang@...nel.org>, linux-csky@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-parisc@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-riscv@...ts.infradead.org,
        live-patching@...r.kernel.org
Subject: Re: [RESEND PATCH v2 1/2] ftrace: disable preemption between
 ftrace_test_recursion_trylock/unlock()

On Wed, 13 Oct 2021 16:34:53 +0800
王贇 <yun.wang@...ux.alibaba.com> wrote:

> On 2021/10/13 下午4:25, Miroslav Benes wrote:
> >>> Side note... the comment will eventually conflict with peterz's 
> >>> https://lore.kernel.org/all/20210929152429.125997206@infradead.org/.  
> >>
> >> Steven, would you like to share your opinion on this patch?
> >>
> >> If klp_synchronize_transition() will be removed anyway, the comments
> >> will be meaningless and we can just drop it :-P  
> > 
> > The comment will still be needed in some form. We will handle it depending 
> > on what gets merged first. peterz's patches are not ready yet.  
> 
> Ok, then I'll move it before trylock() inside klp_ftrace_handler() anyway.

+1

-- Steve