linux-kernel - [PATCH 7/8] s390/boot: do not emit debug info for assembly with llvm's IAS

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Date:   Wed, 11 May 2022 14:05:31 +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 7/8] s390/boot: do not emit debug info for assembly with llvm's IAS

Commit ee6d777d3e93 ("s390/decompressor: support extra debug flags")
added extra debug flags, in particular debug info is created,
depending on config options.

With llvm's IAS this causes this compile warning:

arch/s390/boot/head.S:38:1: warning: DWARF2 only supports one section per compilation unit
.section ".head.text","ax"
^

This is a known problem and was addressed with a commit b8a9092330da
("Kbuild: do not emit debug info for assembly with LLVM_IAS=1").
Just do the same for s390 to get rid of this warning.

Signed-off-by: Heiko Carstens <hca@...ux.ibm.com>
---
 arch/s390/Makefile | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/s390/Makefile b/arch/s390/Makefile
index c59efc83f020..d73611b35164 100644
--- a/arch/s390/Makefile
+++ b/arch/s390/Makefile
@@ -20,7 +20,9 @@ LDFLAGS_vmlinux	:= -pie
 endif
 aflags_dwarf	:= -Wa,-gdwarf-2
 KBUILD_AFLAGS_DECOMPRESSOR := $(CLANG_FLAGS) -m64 -D__ASSEMBLY__
+ifndef CONFIG_AS_IS_LLVM
 KBUILD_AFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO),$(aflags_dwarf))
+endif
 KBUILD_CFLAGS_DECOMPRESSOR := $(CLANG_FLAGS) -m64 -O2 -mpacked-stack
 KBUILD_CFLAGS_DECOMPRESSOR += -DDISABLE_BRANCH_PROFILING -D__NO_FORTIFY
 KBUILD_CFLAGS_DECOMPRESSOR += -fno-delete-null-pointer-checks -msoft-float -mbackchain
-- 
2.32.0