linux-kernel - Re: linux-next: new build warnings after binutils update

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Date:   Fri, 14 Aug 2020 12:24:07 +0200
From:   Ard Biesheuvel <ardb@...nel.org>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Arvind Sankar <nivedita@...m.mit.edu>,
        Kees Cook <keescook@...omium.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: linux-next: new build warnings after binutils update

On Fri, 14 Aug 2020 at 12:22, Ingo Molnar <mingo@...nel.org> wrote:
>
>
> * Ard Biesheuvel <ardb@...nel.org> wrote:
>
> > (+ Arvind, Kees)
> >
> > On Thu, 13 Aug 2020 at 22:58, Stephen Rothwell <sfr@...b.auug.org.au> wrote:
> > >
> > > Hi all,
> > >
> > > After upgading some software, builds of Linus' tree now produce these warnings:
> > >
> > > x86_64-linux-gnu-ld: arch/x86/boot/compressed/head_64.o: warning: relocation in read-only section `.head.text'
> > > x86_64-linux-gnu-ld: warning: creating DT_TEXTREL in a PIE
> > >
> > > I upgraded binutils from 2.34-8 to 2.35-1 (Debian versions).
> > >
> > > $ x86_64-linux-gnu-gcc --version
> > > x86_64-linux-gnu-gcc (Debian 9.3.0-13) 9.3.0
> > >
> > > Any ideas?
> > >
> >
> > Arvind and I have some patches on the list that fix various relocation
> > issues in the decompressor binary.
> >
> > As far as I can tell, Arvind's patch to suppress runtime relocations
> > [0] addresses this exact issue.
> >
> > Unfortunately, in spite of various pings and attempts to get the x86
> > maintainers to notice this series, it has been ignored so far. Perhaps
> > this is a good time to merge it for -rc1/2?
> >
> > [0] https://lore.kernel.org/lkml/20200731202738.2577854-6-nivedita@alum.mit.edu/
>
> It all looked good to me but was a bit late for v5.9, will pick up
> after -rc1.
>

Thanks Ingo.