linux-kernel - RE: [RFC PATCH 13/12] Retpoline vs. CONFIG_TRIM_UNUSED

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Message-ID: <DDC0A53C62D26D419EFD5F13B1AD3EA5BE9763A8@ORSMSX103.amr.corp.intel.com>
Date:   Sun, 7 Jan 2018 17:57:08 +0000
From:   "Lu, Hongjiu" <hongjiu.lu@...el.com>
To:     David Woodhouse <dwmw2@...radead.org>,
        Andi Kleen <ak@...ux.intel.com>,
        "Van De Ven, Arjan" <arjan.van.de.ven@...el.com>,
        "Tsimbalist, Igor V" <igor.v.tsimbalist@...el.com>
CC:     Paul Turner <pjt@...gle.com>, LKML <linux-kernel@...r.kernel.org>,
        "Linus Torvalds" <torvalds@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...ux-foundation.org>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        "Hansen, Dave" <dave.hansen@...el.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        Kees Cook <keescook@...gle.com>,
        Rik van Riel <riel@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...capital.net>,
        Jiri Kosina <jikos@...nel.org>,
        "gnomes@...rguk.ukuu.org.uk" <gnomes@...rguk.ukuu.org.uk>
Subject: RE: [RFC PATCH 13/12] Retpoline vs. CONFIG_TRIM_UNUSED_SYMBOLS

Please checkout patches for GCC 7:

https://github.com/hjl-tools/gcc/commits/hjl/indirect/gcc-7-branch/master

For GCC trunk:

https://github.com/hjl-tools/gcc/commits/hjl/indirect/master

H.J.

> -----Original Message-----
> From: David Woodhouse [mailto:dwmw2@...radead.org]
> Sent: Sunday, January 07, 2018 9:33 AM
> To: Lu, Hongjiu <hongjiu.lu@...el.com>; Andi Kleen <ak@...ux.intel.com>;
> Van De Ven, Arjan <arjan.van.de.ven@...el.com>; Tsimbalist, Igor V
> <igor.v.tsimbalist@...el.com>
> Cc: Paul Turner <pjt@...gle.com>; LKML <linux-kernel@...r.kernel.org>;
> Linus Torvalds <torvalds@...ux-foundation.org>; Greg Kroah-Hartman
> <gregkh@...ux-foundation.org>; Tim Chen <tim.c.chen@...ux.intel.com>;
> Hansen, Dave <dave.hansen@...el.com>; tglx@...utronix.de; Kees Cook
> <keescook@...gle.com>; Rik van Riel <riel@...hat.com>; Peter Zijlstra
> <peterz@...radead.org>; Andy Lutomirski <luto@...capital.net>; Jiri
> Kosina <jikos@...nel.org>; gnomes@...rguk.ukuu.org.uk
> Subject: Re: [RFC PATCH 13/12] Retpoline vs.
> CONFIG_TRIM_UNUSED_SYMBOLS
> 
> On Sun, 2018-01-07 at 15:09 +0000, Lu, Hongjiu wrote:
> > Sure, I can use __x86_indirect_thunk_rax.
> 
> Great, thanks.
> 
> I've made that change on top of your 20171219 patch set which is the
> latest I've seen, and pushed it to my tree at
> http://git.infradead.org/users/dwmw2/gcc-
> retpoline.git/shortlog/refs/heads/retpoline-20180107
> 
> I assume you'll want to redo those patches so that it's
> __x86_indirect_thunk_rax from the start, rather than starting with dots
> and then changing it, but I'll let you deal with that and push it
> upstream. Building compiler now, and then I'll update and simplify the
> kernel patches accordingly.