linux-kernel - Re: [PATCH v6 5/8] kernel: tracepoints: add support for relative references

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Message-ID: <20171228104207.117ee0ff@gandalf.local.home>
Date:   Thu, 28 Dec 2017 10:42:07 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc:     linux-kernel@...r.kernel.org, "H. Peter Anvin" <hpa@...or.com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        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>,
        Russell King <linux@...linux.org.uk>,
        Paul Mackerras <paulus@...ba.org>,
        Catalin Marinas <catalin.marinas@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Petr Mladek <pmladek@...e.com>, Ingo Molnar <mingo@...hat.com>,
        James Morris <james.l.morris@...cle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Nicolas Pitre <nico@...aro.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Jessica Yu <jeyu@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-mips@...ux-mips.org,
        linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
        sparclinux@...r.kernel.org, x86@...nel.org
Subject: Re: [PATCH v6 5/8] kernel: tracepoints: add support for relative
 references

On Wed, 27 Dec 2017 08:50:30 +0000
Ard Biesheuvel <ard.biesheuvel@...aro.org> wrote:

> To avoid the need for relocating absolute references to tracepoint
> structures at boot time when running relocatable kernels (which may
> take a disproportionate amount of space), add the option to emit
> these tables as relative references instead.
> 

I gave this patch a quick skim over. It appears to not modify anything
when CONFIG_HAVE_PREL32_RELOCATIONS is not defined. I haven't
thoroughly reviewed it or tested it. But if it doesn't break anything,
I'm fine giving you an ack.

Acked-by: Steven Rostedt (VMware) <rostedt@...dmis.org>

--  Steve