linux-kernel - Re: [PATCH 00/11] s390: Support linking with ld.lld

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Date: Wed, 14 Feb 2024 12:57:42 -0700
From: Nathan Chancellor <nathan@...nel.org>
To: Heiko Carstens <hca@...ux.ibm.com>
Cc: gor@...ux.ibm.com, agordeev@...ux.ibm.com, borntraeger@...ux.ibm.com,
	svens@...ux.ibm.com, maskray@...gle.com, ndesaulniers@...gle.com,
	linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
	llvm@...ts.linux.dev, patches@...ts.linux.dev
Subject: Re: [PATCH 00/11] s390: Support linking with ld.lld

On Wed, Feb 14, 2024 at 02:43:28PM +0100, Heiko Carstens wrote:
> On Wed, Feb 07, 2024 at 05:14:52PM -0700, Nathan Chancellor wrote:
> > Hi all,
> > 
> > This series allows the s390 kernel to be linked with ld.lld (support for
> > s390 is under review at [1]). This implicitly depends on [2], which was
> > created and sent before it was realized that this series was necessary.
> ...
> > Nathan Chancellor (11):
> >       s390: boot: Add support for CONFIG_LD_ORPHAN_WARN
> >       s390: vmlinux.lds.S: Handle '.data.rel' sections explicitly
> >       s390: vmlinux.lds.S: Explicitly handle '.got' and '.plt' sections
> >       s390: vmlinux.lds.S: Discard unnecessary sections
> >       s390/boot: vmlinux.lds.S: Handle '.init.text'
> >       s390/boot: vmlinux.lds.S: Handle '.rela' sections
> >       s390/boot: vmlinux.lds.S: Handle DWARF debug sections
> >       s390/boot: vmlinux.lds.S: Handle ELF required sections
> >       s390/boot: vmlinux.lds.S: Handle commonly discarded sections
> >       s390: Select CONFIG_ARCH_WANT_LD_ORPHAN_WARN
> >       s390: Link vmlinux with '-z notext'
> > 
> >  arch/s390/Kconfig              |  1 +
> >  arch/s390/Makefile             |  2 +-
> >  arch/s390/boot/Makefile        |  5 +++--
> >  arch/s390/boot/vmlinux.lds.S   | 28 ++++++++++++++++++++++++++++
> >  arch/s390/kernel/vmlinux.lds.S | 28 +++++++++++++++++++++++++++-
> >  5 files changed, 60 insertions(+), 4 deletions(-)
> 
> Now available at:
> https://git.kernel.org/pub/scm/linux/kernel/git/s390/linux.git/log/?h=features
> 
> And should be in linux-next soon.
> 
> Thanks a lot! :)

Thank you for bearing with the issues that came up in the series and
getting it reviewed and accepted quickly!

The ld.lld pull request has been merged into main:

https://github.com/llvm/llvm-project/commit/fe3406e349884e4ef61480dd0607f1e237102c74

and Fangrui requested a backport to 18.1.0, so it is possible that
people will get access to this even quicker:

https://github.com/llvm/llvm-project/pull/81675

I did not CC you all on this one but it is needed to avoid a link error
with ld.lld when CONFIG_DEBUG_INFO_BTF is enabled but it is not specific
to s390 so it will go via the kbuild tree (hopefully for 6.8):

https://lore.kernel.org/20240212-fix-elf-type-btf-vmlinux-bin-o-big-endian-v2-1-22c0a6352069@kernel.org/

With that change on top of features, all my builds pass successfully
with ld.lld :) I'll be sending another change your way shortly for
something that came up during my testing with GCC + ld.lld.

Cheers,
Nathan