linux-kernel - Re: [PATCH v3 0/6] Static calls

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Message-ID: <CAHk-=whR7LzKcuB9Z2km1T25DUkJcbE9rNhCzApAPADbDqMhmQ@mail.gmail.com>
Date:   Thu, 10 Jan 2019 15:02:22 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Andy Lutomirski <luto@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Jason Baron <jbaron@...mai.com>, Jiri Kosina <jkosina@...e.cz>,
        David Laight <David.Laight@...lab.com>,
        Borislav Petkov <bp@...en8.de>,
        Julia Cartwright <julia@...com>, Jessica Yu <jeyu@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>, Nadav Amit <namit@...are.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Edward Cree <ecree@...arflare.com>,
        Daniel Bristot de Oliveira <bristot@...hat.com>
Subject: Re: [PATCH v3 0/6] Static calls

On Thu, Jan 10, 2019 at 12:52 PM Josh Poimboeuf <jpoimboe@...hat.com> wrote:
>
> Right, emulating a call instruction from the #BP handler is ugly,
> because you have to somehow grow the stack to make room for the return
> address.  Personally I liked the idea of shifting the iret frame by 16
> bytes in the #DB entry code, but others hated it.

Yeah, I hated it.

But I'm starting to think it's the simplest solution.

So still not loving it, but all the other models have had huge issues too.

                Linus