linux-kernel - Re: [PATCH 4.14 114/165] x86/vdso: Fix vDSO build if a retpoline is emitted

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Date:   Wed, 3 Oct 2018 11:14:46 +0200
From:   Nikola Ciprich <nikola.ciprich@...uxbox.cz>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     Greg KH <gregkh@...uxfoundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        stable <stable@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Matt Rickard <matt@...trans.com.au>,
        Borislav Petkov <bp@...en8.de>, jason.vas.dias@...il.com,
        David Woodhouse <dwmw2@...radead.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Nikola Ciprich <nikola.ciprich@...uxbox.cz>
Subject: Re: [PATCH 4.14 114/165] x86/vdso: Fix vDSO build if a retpoline is
 emitted

Hi Andy,

yes, it indeed does fix the problem.

Thanks!

nik


On Tue, Oct 02, 2018 at 09:27:21PM -0700, Andy Lutomirski wrote:
> On Tue, Oct 2, 2018 at 1:21 AM Nikola Ciprich
> <nikola.ciprich@...uxbox.cz> wrote:
> >
> > Hi Greg and others,
> >
> > sorry for reporting this so late, but still...
> >
> > this breaks build on older compilers, since it requires
> > -mindirect-branch=thunk-inline -mindirect-branch-register even though
> > retpoline support is disabled in kernel config.. is this expected?
> >
> 
> Nope, my patch was buggy.  Can you test the fix I just sent?
> 

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