linux-kernel - Re: [PATCH 1/2] tracepoints: Add helper to test if tracepoint is enabled in a header

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Date:   Thu, 24 Sep 2020 16:25:38 -0400 (EDT)
From:   Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To:     rostedt <rostedt@...dmis.org>
Cc:     linux-kernel <linux-kernel@...r.kernel.org>,
        Yafang Shao <laoar.shao@...il.com>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Michel Lespinasse <walken@...gle.com>,
        Daniel Jordan <daniel.m.jordan@...cle.com>,
        Davidlohr Bueso <dbueso@...e.de>,
        linux-mm <linux-mm@...ck.org>, Ingo Molnar <mingo@...nel.org>,
        Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: [PATCH 1/2] tracepoints: Add helper to test if tracepoint is
 enabled in a header

----- On Sep 24, 2020, at 3:40 PM, rostedt rostedt@...dmis.org wrote:

> On Thu, 24 Sep 2020 15:35:17 -0400
> Steven Rostedt <rostedt@...dmis.org> wrote:
> 
>> > I'm ok with tracepoint_enabled(). However, I would have placed it in
>> > tracepoint.h rather than tracepoint-defs.h, and we should figure out
>> > why people complain that tracepoint.h is including headers too
>> > eagerly.
>> 
>> I could see if it would work in tracepoints.h.
>> 
>> It might. I was just being extra cautious.
> 
> Well that blew up quick!
> 
> Try using tracepoint.h in include/linux/page_ref.h and
> arch/x86/include/asm/msr.h and see what happens.

Indeed, msr.h is an issue. So having tracepoint_enabled() in
include/linux/tracepoints-defs.h and going through a function
would make sense for this kind of core use-case I guess.

I tried including tracepoint.h from include/linux/page_ref.h
and did not notice any compile issue. Am I missing something
to trigger an issue related to that scenario ?

Thanks,

Mathieu

-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com