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Message-ID: <202109300149.dLBtG8Ez-lkp@intel.com>
Date: Thu, 30 Sep 2021 01:26:09 +0800
From: kernel test robot <lkp@...el.com>
To: Nathan Chancellor <nathan@...nel.org>,
Masahiro Yamada <masahiroy@...nel.org>,
Michal Marek <michal.lkml@...kovi.net>,
Nick Desaulniers <ndesaulniers@...gle.com>
Cc: llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
clang-built-linux@...glegroups.com,
Nathan Chancellor <nathan@...nel.org>
Subject: Re: [PATCH 2/2] Makefile: Only specify '--prefix=' when building
with clang + GNU as
Hi Nathan,
I love your patch! Perhaps something to improve:
[auto build test WARNING on 7a7fd0de4a9804299793e564a555a49c1fc924cb]
url: https://github.com/0day-ci/linux/commits/Nathan-Chancellor/Makefile-Remove-gcc-toolchain-flag/20210929-112213
base: 7a7fd0de4a9804299793e564a555a49c1fc924cb
config: x86_64-randconfig-a014-20210929 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project dc6e8dfdfe7efecfda318d43a06fae18b40eb498)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# https://github.com/0day-ci/linux/commit/74a168f9e88d9edf5aaa8209d2c39e676de2857a
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Nathan-Chancellor/Makefile-Remove-gcc-toolchain-flag/20210929-112213
git checkout 74a168f9e88d9edf5aaa8209d2c39e676de2857a
# save the attached .config to linux build tree
mkdir build_dir
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash arch/x86/entry/ arch/x86/kernel/ arch/x86/lib/ kernel/
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>
All warnings (new ones prefixed by >>):
>> arch/x86/entry/entry_64.S:47:1: warning: DWARF2 only supports one section per compilation unit
.section .entry.text, "ax"
^
>> <instantiation>:11:2: warning: DWARF2 only supports one section per compilation unit
.pushsection .altinstr_replacement,"ax"
^
<instantiation>:1:1: note: while in macro instantiation
ALTERNATIVE "jmp .Lend_2", "", ( 7*32+11)
^
arch/x86/entry/entry_64.S:93:2: note: while in macro instantiation
SWITCH_TO_KERNEL_CR3 scratch_reg=%rsp
^
arch/x86/entry/entry_64.S:741:2: warning: DWARF2 only supports one section per compilation unit
.section .fixup, "ax"
^
--
>> arch/x86/entry/entry_64_compat.S:20:2: warning: DWARF2 only supports one section per compilation unit
.section .entry.text, "ax"
^
>> <instantiation>:11:2: warning: DWARF2 only supports one section per compilation unit
.pushsection .altinstr_replacement,"ax"
^
<instantiation>:1:1: note: while in macro instantiation
ALTERNATIVE "jmp .Lend_2", "", ( 7*32+11)
^
arch/x86/entry/entry_64_compat.S:55:2: note: while in macro instantiation
SWITCH_TO_KERNEL_CR3 scratch_reg=%rax
^
--
>> arch/x86/kernel/head_64.S:42:2: warning: DWARF2 only supports one section per compilation unit
.section ".head.text","ax"
^
arch/x86/kernel/head_64.S:352:2: warning: DWARF2 only supports one section per compilation unit
.section ".init.text","ax"
^
--
>> arch/x86/lib/copy_mc_64.S:138:2: warning: DWARF2 only supports one section per compilation unit
.section .fixup, "ax"
^
--
>> <instantiation>:11:2: warning: DWARF2 only supports one section per compilation unit
.pushsection .altinstr_replacement,"ax"
^
arch/x86/lib/copy_page_64.S:17:2: note: while in macro instantiation
ALTERNATIVE "jmp copy_page_regs", "", ( 3*32+16)
^
--
>> <instantiation>:11:2: warning: DWARF2 only supports one section per compilation unit
.pushsection .altinstr_replacement,"ax"
^
arch/x86/lib/copy_user_64.S:58:2: note: while in macro instantiation
ALTERNATIVE "", ".byte 0x0f,0x01,0xcb", ( 9*32+20)
^
<instantiation>:15:2: warning: DWARF2 only supports one section per compilation unit
.section .fixup,"ax"
^
arch/x86/lib/copy_user_64.S:61:2: note: while in macro instantiation
ALIGN_DESTINATION
^
--
>> <instantiation>:11:2: warning: DWARF2 only supports one section per compilation unit
.pushsection .altinstr_replacement,"ax"
^
arch/x86/lib/getuser.S:56:2: note: while in macro instantiation
ALTERNATIVE "", ".byte 0x0f,0x01,0xcb", ( 9*32+20)
^
--
>> arch/x86/lib/memcpy_64.S:10:1: warning: DWARF2 only supports one section per compilation unit
.pushsection .noinstr.text, "ax"
^
<instantiation>:13:2: warning: DWARF2 only supports one section per compilation unit
.pushsection .altinstr_replacement,"ax"
^
arch/x86/lib/memcpy_64.S:32:2: note: while in macro instantiation
ALTERNATIVE_2 "jmp memcpy_orig", "", ( 3*32+16), "jmp memcpy_erms", ( 9*32+ 9)
^
--
>> <instantiation>:11:2: warning: DWARF2 only supports one section per compilation unit
.pushsection .altinstr_replacement,"ax"
^
arch/x86/lib/memmove_64.S:42:2: note: while in macro instantiation
ALTERNATIVE "cmp $0x20, %rdx; jb 1f", "", (18*32+ 4)
^
--
>> <instantiation>:11:2: warning: DWARF2 only supports one section per compilation unit
.pushsection .altinstr_replacement,"ax"
^
arch/x86/lib/putuser.S:51:2: note: while in macro instantiation
ALTERNATIVE "", ".byte 0x0f,0x01,0xcb", ( 9*32+20)
^
vim +47 arch/x86/entry/entry_64.S
6fd166aae78c0a arch/x86/entry/entry_64.S Peter Zijlstra 2017-12-04 45
^1da177e4c3f41 arch/x86_64/kernel/entry.S Linus Torvalds 2005-04-16 46 .code64
ea7145477a461e arch/x86/kernel/entry_64.S Jiri Olsa 2011-03-07 @47 .section .entry.text, "ax"
ea7145477a461e arch/x86/kernel/entry_64.S Jiri Olsa 2011-03-07 48
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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