linux-kernel - [PATCH 0/8] s390: allow to build with llvm's integrated assembler

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Date:   Wed, 11 May 2022 14:05:24 +0200
From:   Heiko Carstens <hca@...ux.ibm.com>
To:     Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Jonas Paulsson <paulsson@...ux.vnet.ibm.com>,
        Ulrich Weigand <ulrich.weigand@...ibm.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Alexander Egorenkov <egorenar@...ux.ibm.com>
Cc:     Sven Schnelle <svens@...ux.ibm.com>,
        Andreas Krebbel <krebbel@...ux.ibm.com>,
        Nathan Chancellor <natechancellor@...il.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org
Subject: [PATCH 0/8] s390: allow to build with llvm's integrated assembler

A couple of patches which in result make it finally possible to build the
kernel for s390 with llvm's integrated assembler. Several configs build
without errors or warnings, and the kernel also works as expected.

Note that patch 6 ("s390/boot: workaround llvm IAS bug") reveals a
miscompile. This looks like a bug in the instruction definitions of the mvc
and clc instructions(?). I'd like to ask people to look into this, since
this silently generated broken code.

This patch series is based on linux-next, which contains two additional
required s390 specific patches to make llvm's IAS work.

Thanks,
Heiko

Heiko Carstens (8):
  s390/alternatives: provide identical sized orginal/alternative sequences
  s390/alternatives: remove padding generation code
  s390/entry: shorten OUTSIDE macro
  s390/entry: workaround llvm's IAS limitations
  s390/purgatory: workaround llvm's IAS limitations
  s390/boot: workaround llvm IAS bug
  s390/boot: do not emit debug info for assembly with llvm's IAS
  scripts/min-tool-version.sh: raise minimum clang version to 14.0.0 for s390

 arch/s390/Makefile                      |  2 +
 arch/s390/boot/head.S                   | 34 +++++----
 arch/s390/include/asm/alternative-asm.h | 76 +++-----------------
 arch/s390/include/asm/alternative.h     | 93 ++++++-------------------
 arch/s390/include/asm/spinlock.h        |  2 +-
 arch/s390/kernel/alternative.c          | 61 +---------------
 arch/s390/kernel/entry.S                | 39 +++++++----
 arch/s390/lib/spinlock.c                |  4 +-
 arch/s390/purgatory/head.S              | 29 ++++++--
 scripts/min-tool-version.sh             |  3 +-
 10 files changed, 104 insertions(+), 239 deletions(-)

-- 
2.32.0