I believe we do have the infrastructure in llvm to implement a working patch.
The "asm goto" was introduced as a solution to a problem (optimizing 
tracepoints/ nop patching).
When we started the discussion in llvm about adding this feature, questions 
arose if we can design a better solution for this problem than "asm goto".

You can find a more about the discussion in the llvm community here:

* This is the middle of the thread, and there are more messages later on.


-----Original Message-----
From: Greg Kroah-Hartman [mailto:gre...@linux-foundation.org] 
Sent: Wednesday, February 14, 2018 11:53
To: Chandler Carruth <chandl...@google.com>
Cc: Yatsina, Marina <marina.yats...@intel.com>; Kees Cook 
<keesc...@google.com>; David Woodhouse <dw...@infradead.org>; Kreitzer, David L 
<david.l.kreit...@intel.com>; Grischenko, Andrei L 
<andrei.l.grische...@intel.com>; r...@google.com; LLVM Developers 
<llvm-...@lists.llvm.org>; eh...@mozilla.com; Tayree, Coby 
<coby.tay...@intel.com>; Matthias Braun <ma...@braunis.de>; Dean Michael Berris 
<dean.ber...@gmail.com>; James Y Knight <jykni...@google.com>; Guenter Roeck 
<li...@roeck-us.net>; X86 ML <x...@kernel.org>; LKML 
<linux-kernel@vger.kernel.org>; Alan Cox <gno...@lxorguk.ukuu.org.uk>; Rik van 
Riel <r...@redhat.com>; Andi Kleen <a...@linux.intel.com>; Josh Poimboeuf 
<jpoim...@redhat.com>; Tom Lendacky <thomas.lenda...@amd.com>; Peter Zijlstra 
<pet...@infradead.org>; Linus Torvalds <torva...@linux-foundation.org>; Jiri 
Kosina <ji...@kernel.org>; Andy Lutomirski <l...@amacapital.net>; Hansen, Dave 
<dave.han...@intel.com>; Tim Chen <tim.c.c...@linux.intel.com>; Paul Turner 
<p...@google.com>; Stephen Hines <srhi...@google.com>; Nick Desaulniers 
Subject: Re: clang asm-goto support (Was Re: [PATCH v2] x86/retpoline: Add 
clang support)

On Wed, Feb 14, 2018 at 08:41:43AM +0000, Chandler Carruth wrote:
> Marina, Kees:
> I think the combination of LKML and the LLVM developer's list is 
> probably too large a set of folks to have a (somewhat) lengthy 
> exploration of options and how to go about this and find a good path forward.

Why is there any need to discuss "options" here?  What is preventing the 
implementation of "asm goto" in llvm?  Is it the lack of a working patch, or 
something else?


greg k-h
Intel Israel (74) Limited

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