linux-kernel - Re: [PATCH] tracepoint: Do not fail unregistering a probe due to memory allocation

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Message-ID: <20201117201101.366bee30@oasis.local.home>
Date:   Tue, 17 Nov 2020 20:11:01 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc:     linux-kernel <linux-kernel@...r.kernel.org>,
        Matt Mullins <mmullins@...x.us>,
        Ingo Molnar <mingo@...hat.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        netdev <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        Kees Cook <keescook@...omium.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH] tracepoint: Do not fail unregistering a probe due to
 memory allocation

On Tue, 17 Nov 2020 18:08:19 -0500 (EST)
Mathieu Desnoyers <mathieu.desnoyers@...icios.com> wrote:

> Because of this end-of-loop condition ^
> which is also testing for a NULL func. So if we reach a stub, we end up stopping
> iteration and not firing the following tracepoint probes.

Ah right. OK, since it's looking like we're going to have to modify the
tracepoint macro anyway, I'll just go with the 1UL approach.

-- Steve