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Re: [PATCH 1/5] x86: Add -mindirect-branch=

From: David Woodhouse <dwmw2 at infradead dot org>
To: Jan Hubicka <hubicka at ucw dot cz>, Markus Trippelsdorf <markus at trippelsdorf dot de>
Cc: "H.J. Lu" <hjl dot tools at gmail dot com>, gcc-patches at gcc dot gnu dot org
Date: Sun, 14 Jan 2018 20:46:06 +0100
Subject: Re: [PATCH 1/5] x86: Add -mindirect-branch=
Authentication-results: sourceware.org; auth=none
References: <20180114033707.6297-1-hjl.tools@gmail.com> <20180114033707.6297-2-hjl.tools@gmail.com> <20180114104631.GA14673@atrey.karlin.mff.cuni.cz> <20180114110416.GA5785@x4> <20180114110641.GA73117@kam.mff.cuni.cz>

On Sun, 2018-01-14 at 12:06 +0100, Jan Hubicka wrote:
> 
> Yes, according to my understanding we want both pause and lefence by default
> (it is expensive anyway) + command line option to control which one to use?
> 
> Probably thus the first patch should default to both.

In the kernel we're going to just do both. I'm not sure I see the merit
in a command line option.

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References:
- [PATCH 0/5] x86: CVE-2017-5715, aka Spectre
  - From: H.J. Lu
- [PATCH 1/5] x86: Add -mindirect-branch=
  - From: H.J. Lu
- Re: [PATCH 1/5] x86: Add -mindirect-branch=
  - From: Jan Hubicka
- Re: [PATCH 1/5] x86: Add -mindirect-branch=
  - From: Markus Trippelsdorf
- Re: [PATCH 1/5] x86: Add -mindirect-branch=
  - From: Jan Hubicka

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