arch/mips/boot/compressed/../../../../lib/ashldi3.c:9:19: warning: no previous prototype for function '__ashldi3'

From: kernel test robot
Date: Sat Aug 20 2022 - 04:04:09 EST


Hi Masahiro,

FYI, the error/warning still remains.

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 50cd95ac46548429e5bba7ca75cc97d11a697947
commit: f78b25ee922ef6faf59a258af1b9388ca894cfd9 mips: decompressor: do not copy source files while building
date: 9 months ago
config: mips-loongson1c_defconfig (https://download.01.org/0day-ci/archive/20220820/202208201544.3bfagcR3-lkp@xxxxxxxxx/config)
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project c9a41fe60ab62f7a40049c100adcc8087a47669b)
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
# install mips cross compiling tool for clang build
# apt-get install binutils-mipsel-linux-gnu
# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f78b25ee922ef6faf59a258af1b9388ca894cfd9
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout f78b25ee922ef6faf59a258af1b9388ca894cfd9
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=mips SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@xxxxxxxxx>

Note: functions only called from assembly code should be annotated with the asmlinkage attribute
All warnings (new ones prefixed by >>):

In file included from arch/mips/boot/compressed/ashldi3.c:2:
>> arch/mips/boot/compressed/../../../../lib/ashldi3.c:9:19: warning: no previous prototype for function '__ashldi3' [-Wmissing-prototypes]
long long notrace __ashldi3(long long u, word_type b)
^
arch/mips/boot/compressed/../../../../lib/ashldi3.c:9:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
long long notrace __ashldi3(long long u, word_type b)
^
static
1 warning generated.


vim +/__ashldi3 +9 arch/mips/boot/compressed/../../../../lib/ashldi3.c

b35cd9884fa5d8 Palmer Dabbelt 2017-05-23 8
b35cd9884fa5d8 Palmer Dabbelt 2017-05-23 @9 long long notrace __ashldi3(long long u, word_type b)

:::::: The code at line 9 was first introduced by commit
:::::: b35cd9884fa5d81c9d5e7f57c9d03264ae2bd835 lib: Add shared copies of some GCC library routines

:::::: TO: Palmer Dabbelt <palmer@xxxxxxxxxxx>
:::::: CC: Palmer Dabbelt <palmer@xxxxxxxxxxx>

--
0-DAY CI Kernel Test Service
https://01.org/lkp