linux-kernel - Re: [PATCH] ppc: add "-z notext" flag to disable diagnostic

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Message-ID: <CAKwvOd=rN9s5YBtt-AMnaqXhYCsAT=6yp29_oomRvTaev6Q6zw@mail.gmail.com>
Date:   Fri, 13 Aug 2021 11:59:21 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Bill Wendling <morbo@...gle.com>
Cc:     Daniel Axtens <dja@...ens.net>, Fangrui Song <maskray@...gle.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Nathan Chancellor <nathan@...nel.org>,
        linuxppc-dev@...ts.ozlabs.org, LKML <linux-kernel@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>
Subject: Re: [PATCH] ppc: add "-z notext" flag to disable diagnostic

On Fri, Aug 13, 2021 at 11:24 AM Bill Wendling <morbo@...gle.com> wrote:
>
> BTW, this patch should more properly be attributed to Fangrui Song. I
> can send a follow-up patch that reflects this and adds more context to
> the commit message.

Sounds good to me. The TL;DR is that LLD has a different implicit
default for `-z text` vs `-z notext` than BFD.  We can emulate the
behavior or BFD by simply being explicit about `-z notext` always.

Or we can dig through why there are relocations in read only sections,
fix those, then enable `-z text` for all linkers.  My recommendation
would be get the thing building, then go digging time permitting.
-- 
Thanks,
~Nick Desaulniers