linux-kernel - Re: [PATCH v5 2/6] arm64: vdso32: Detect binutils support for dmb ishld

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Date:   Thu, 3 Oct 2019 21:59:32 +0100
From:   Will Deacon <will@...nel.org>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Vincenzo Frascino <vincenzo.frascino@....com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andy Lutomirski <luto@...nel.org>
Subject: Re: [PATCH v5 2/6] arm64: vdso32: Detect binutils support for dmb
 ishld

On Thu, Oct 03, 2019 at 01:56:39PM -0700, Nick Desaulniers wrote:
> On Thu, Oct 3, 2019 at 1:49 PM Will Deacon <will@...nel.org> wrote:
> >
> > On Thu, Oct 03, 2019 at 01:18:16PM -0700, Nick Desaulniers wrote:
> > > On Thu, Oct 3, 2019 at 10:48 AM Vincenzo Frascino
> > > <vincenzo.frascino@....com> wrote:
> > > >
> > > > Older versions of binutils that do not support certain types of memory
> > > > barriers can cause build failure of the vdso32 library.
> > >
> > > Do you know specific version numbers of binutils that are affected?
> > > May be helpful to have in the commit message just for future
> > > travelers.
> >
> > A quick bit of archaeology suggests e797f7e0b2be added this back in 2012,
> > which seems to correlate with the 2.24 release.
> 
> Cool, thanks for digging.  Vincenzo, can we please add that to the
> commit message?

If this is the only change, then I can add it when I apply -- no need to
respin just for this! (although I'm also writing this to remind myself :)

Will