linux-kernel - Re: [PATCH v2 6/6] kernel: tracepoints: add support for relative references

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Message-ID: <20170818095206.565b6e4c@gandalf.local.home>
Date:   Fri, 18 Aug 2017 09:52:06 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        "H. Peter Anvin" <hpa@...or.com>, Arnd Bergmann <arnd@...db.de>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Kees Cook <keescook@...omium.org>,
        Will Deacon <will.deacon@....com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Thomas Garnier <thgarnie@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Petr Mladek <pmladek@...e.com>, Ingo Molnar <mingo@...hat.com>,
        James Morris <james.l.morris@...cle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Joe Perches <joe@...ches.com>, Nicolas Pitre <nico@...aro.org>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andy Whitcroft <apw@...onical.com>,
        Jessica Yu <jeyu@...nel.org>
Subject: Re: [PATCH v2 6/6] kernel: tracepoints: add support for relative
 references

On Fri, 18 Aug 2017 14:44:15 +0100
Ard Biesheuvel <ard.biesheuvel@...aro.org> wrote:

> >> It appears the stuff above needs to be move inside the double-include
> >> guard (which oddly enough does not cover the entire file)  
> >
> > Why was this moved to the header file? To fulfill some checkpatch
> > warning?
> >  
> 
> Yes.

My preference is to ignore that checkpatch warning. The section
variables are created by linker magic, and not normal "extern"
variables. They are only used in one location, and I like to keep them
where they are used, and not be something other places might think they
can be used. In other words, keep them by the C code, and out of
headers.

Tracepoints and linker/asm work always triggers a lot of bogus
checkpatch warnings. Which is unfortunate. :-/

Thanks!

-- Steve