linux-kernel - Re: [PATCH] tracing: Have all levels of checks prevent recursion

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Message-ID: <20230721182235.6617a466@kernel.org>
Date:   Fri, 21 Jul 2023 18:22:35 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Alexander Lobakin <aleksander.lobakin@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.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>, Miroslav Benes <mbenes@...e.cz>,
        Petr Mladek <pmladek@...e.com>,
        Joe Lawrence <joe.lawrence@...hat.com>,
        Colin Ian King <colin.king@...onical.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        "Nicholas Piggin" <npiggin@...il.com>,
        Jisheng Zhang <jszhang@...nel.org>,
        <linux-csky@...r.kernel.org>, <linux-parisc@...r.kernel.org>,
        <linuxppc-dev@...ts.ozlabs.org>, <linux-riscv@...ts.infradead.org>,
        <live-patching@...r.kernel.org>,
        王贇 <yun.wang@...ux.alibaba.com>,
        Guo Ren <guoren@...nel.org>
Subject: Re: [PATCH] tracing: Have all levels of checks prevent recursion

On Fri, 21 Jul 2023 12:26:32 -0400 Steven Rostedt wrote:
> > if (!(in_hardirq() || irqs_disabled()))
> >   
> 
> Yeah, probably.
> 
> > , nothing more elegant / already existing / ...?  
> 
> It's not a common check. What would you call that?

Looks like Olek started the weekend already so let me answer.
He's trying to check if we can use a fast path cache which takes
a _bh spin lock.