linux-kernel - Re: [PATCH] powerpc/vdso32: mark __kernel_datapage_offset as STV

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Message-ID: <20200207064210.GA13125@ubuntu-x2-xlarge-x86>
Date:   Thu, 6 Feb 2020 23:42:10 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Christophe Leroy <christophe.leroy@....fr>
Cc:     Fangrui Song <maskray@...gle.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com
Subject: Re: [PATCH] powerpc/vdso32: mark __kernel_datapage_offset as
 STV_PROTECTED

On Wed, Feb 05, 2020 at 07:25:59AM +0100, Christophe Leroy wrote:
> 
> 
> Le 05/02/2020 à 01:50, Fangrui Song a écrit :
> > A PC-relative relocation (R_PPC_REL16_LO in this case) referencing a
> > preemptible symbol in a -shared link is not allowed.  GNU ld's powerpc
> > port is permissive and allows it [1], but lld will report an error after
> > https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id=ec0895f08f99515194e9fcfe1338becf6f759d38
> 
> Note that there is a series whose first two patches aim at dropping
> __kernel_datapage_offset . See
> https://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=156045 and
> especially patches https://patchwork.ozlabs.org/patch/1231467/ and
> https://patchwork.ozlabs.org/patch/1231461/
> 
> Those patches can be applied independentely of the rest.
> 
> Christophe

If that is the case, it would be nice if those could be fast tracked to
5.6 because as it stands now, all PowerPC builds that were working with
ld.lld are now broken. Either that or take this patch and rebase that
series on this one.

Cheers,
Nathan