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Date:   Fri, 11 Jan 2019 15:32:02 -0600
From:   Josh Poimboeuf <jpoimboe@redhat.com>
To:     Linus Torvalds <torvalds@linux-foundation.org>
Cc:     Andy Lutomirski <luto@kernel.org>, Nadav Amit <namit@vmware.com>,
        Peter Zijlstra <peterz@infradead.org>,
        the arch/x86 maintainers <x86@kernel.org>,
        Linux List Kernel Mailing <linux-kernel@vger.kernel.org>,
        Ard Biesheuvel <ard.biesheuvel@linaro.org>,
        Steven Rostedt <rostedt@goodmis.org>,
        Ingo Molnar <mingo@kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        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>,
        Julia Cartwright <julia@ni.com>, Jessica Yu <jeyu@kernel.org>,
        "H. Peter Anvin" <hpa@zytor.com>,
        Rasmus Villemoes <linux@rasmusvillemoes.dk>,
        Edward Cree <ecree@solarflare.com>,
        Daniel Bristot de Oliveira <bristot@redhat.com>
Subject: Re: [PATCH v3 0/6] Static calls
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On Fri, Jan 11, 2019 at 01:10:47PM -0800, Linus Torvalds wrote:
> On Fri, Jan 11, 2019 at 1:05 PM Andy Lutomirski <luto@kernel.org> wrote:
> >
> > > Yeah, my suggestion doesn't allow for batching, since it would
> > > basically generate one trampoline for every rewritten instruction.
> >
> > Sure it does.  Just make 1000 trampolines and patch 1000 sites in a
> > batch :)  As long as the number of trampolines is smallish (e.g. fits
> > in a page), then we should be in good shape.
> 
> Yeah, I guess that's true.
> 
> But let's not worry about it. I don't think we do batching for any
> alternative instruction rewriting right now, do we?

Not at the moment, but Daniel has been working on some patches to do so:

  https://lkml.kernel.org/r/cover.1545228276.git.bristot@redhat.com

-- 
Josh