linux-kernel - Re: [PATCH v3 3/3] x86/retpoline: Convert generic specific retpolines to use RETPOLINE

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Message-ID: <1515597637.22302.185.camel@amazon.co.uk>
Date:   Wed, 10 Jan 2018 15:20:37 +0000
From:   "Woodhouse, David" <dwmw@...zon.co.uk>
To:     Tom Lendacky <thomas.lendacky@....com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "andi@...stfloor.org" <andi@...stfloor.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "tim.c.chen@...ux.intel.com" <tim.c.chen@...ux.intel.com>,
        "torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org>,
        "ak@...ux.intel.com" <ak@...ux.intel.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "luto@...nel.org" <luto@...nel.org>,
        "pjt@...gle.com" <pjt@...gle.com>,
        "dave.hansen@...el.com" <dave.hansen@...el.com>,
        "jikos@...nel.org" <jikos@...nel.org>,
        "gregkh@...ux-foundation.org" <gregkh@...ux-foundation.org>
Subject: Re: [PATCH v3 3/3] x86/retpoline: Convert generic specific
 retpolines to use RETPOLINE_GENERIC

On Wed, 2018-01-10 at 09:18 -0600, Tom Lendacky wrote:
> 
> Ok, hence my caveat on the underflow in the reply.  If it's to eliminate
> userspace addresses, then yes, it needs to be applied for AMD as well.
> 
> In that case maybe the comments in arch/x86/entry/entry_{32,64}.S need to
> be updated since they only talk about underflow.

I think we're dropping that patch anyway. qv¹.

(¹ About to hit 'send' on that...)
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