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Date:   Sun, 11 Nov 2018 00:20:59 +0100
From:   Peter Zijlstra <peterz@infradead.org>
To:     Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc:     Ingo Molnar <mingo@kernel.org>,
        Josh Poimboeuf <jpoimboe@redhat.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        the arch/x86 maintainers <x86@kernel.org>,
        Andy Lutomirski <luto@kernel.org>,
        Steven Rostedt <rostedt@goodmis.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Masami Hiramatsu <mhiramat@kernel.org>,
        Jason Baron <jbaron@akamai.com>, Jiri Kosina <jkosina@suse.cz>,
        David Laight <David.Laight@aculab.com>,
        Borislav Petkov <bp@alien8.de>
Subject: Re: [PATCH RFC 0/3] Static calls
Message-ID: <20181110232059.GA12766@worktop.psav.com>
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On Fri, Nov 09, 2018 at 02:50:27PM +0100, Ard Biesheuvel wrote:
> On 9 November 2018 at 08:28, Ingo Molnar <mingo@kernel.org> wrote:
> >> - I'm not sure about the objtool approach.  Objtool is (currently)
> >>   x86-64 only, which means we have to use the "unoptimized" version
> >>   everywhere else.  I may experiment with a GCC plugin instead.
> >
> > I'd prefer the objtool approach. It's a pretty reliable first-principles
> > approach while GCC plugin would have to be replicated for Clang and any
> > other compilers, etc.
> >
> 
> I implemented the GCC plugin approach here for arm64

I'm confused; I though we only needed objtool for variable instruction
length architectures, because we can't reliably decode our instruction
stream. Otherwise we can fairly trivially use the DWARF relocation data,
no?