linux-kernel - [PATCH] mips: vdso: fix DWARF2 warning

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Date:   Fri, 15 Jan 2021 20:13:30 +0100
From:   Anders Roxell <anders.roxell@...aro.org>
To:     tsbogend@...ha.franken.de, natechancellor@...il.com,
        ndesaulniers@...gle.com
Cc:     linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com,
        Anders Roxell <anders.roxell@...aro.org>,
        stable@...r.kernel.org
Subject: [PATCH] mips: vdso: fix DWARF2 warning

When building mips tinyconifg the following warning show up

make --silent --keep-going --jobs=8 O=/home/anders/src/kernel/next/out/builddir ARCH=mips CROSS_COMPILE=mips-linux-gnu- HOSTCC=clang CC=clang
/srv/src/kernel/next/arch/mips/vdso/elf.S:14:1: warning: DWARF2 only supports one section per compilation unit
.pushsection .note.Linux, "a",@note ; .balign 4 ; .long 2f - 1f ; .long 4484f - 3f ; .long 0 ; 1:.asciz "Linux" ; 2:.balign 4 ; 3:
^
/srv/src/kernel/next/arch/mips/vdso/elf.S:34:2: warning: DWARF2 only supports one section per compilation unit
 .section .mips_abiflags, "a"
 ^

Rework so the mips vdso Makefile adds flag '-no-integrated-as' unless
LLVM_IAS is defined.

Link: https://github.com/ClangBuiltLinux/linux/issues/1256
Cc: stable@...r.kernel.org # v4.19+
Suggested-by: Nick Desaulniers <ndesaulniers@...gle.com>
Signed-off-by: Anders Roxell <anders.roxell@...aro.org>
---
 arch/mips/vdso/Makefile | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/mips/vdso/Makefile b/arch/mips/vdso/Makefile
index 5810cc12bc1d..83e8cf216ac8 100644
--- a/arch/mips/vdso/Makefile
+++ b/arch/mips/vdso/Makefile
@@ -26,6 +26,10 @@ ifdef CONFIG_CC_IS_CLANG
 ccflags-vdso += $(filter --target=%,$(KBUILD_CFLAGS))
 endif
 
+ifneq ($(LLVM_IAS),1)
+ccflags-vdso += -no-integrated-as
+endif
+
 #
 # The -fno-jump-tables flag only prevents the compiler from generating
 # jump tables but does not prevent the compiler from emitting absolute
-- 
2.29.2