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Subjectarch/mips/boot/compressed/../../../../lib/ashldi3.c:9:19: warning: no previous prototype for function '__ashldi3'
Hi Masahiro,

FYI, the error/warning still remains.

tree: master
head: 6f34f8c3d6178527d4c02aa3a53c370cc70cb91e
commit: f78b25ee922ef6faf59a258af1b9388ca894cfd9 mips: decompressor: do not copy source files while building
date: 5 months ago
config: mips-loongson1c_defconfig (
compiler: clang version 15.0.0 ( c4a1b07d0979e7ff20d7d541af666d822d66b566)
reproduce (this is a W=1 build):
wget -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# install mips cross compiling tool for clang build
# apt-get install binutils-mips-linux-gnu
git remote add linus
git fetch --no-tags linus master
git checkout f78b25ee922ef6faf59a258af1b9388ca894cfd9
# save the config file to linux build tree
mkdir build_dir
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 as appropriate
Reported-by: kernel test robot <>

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)
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 <>
:::::: CC: Palmer Dabbelt <>

0-DAY CI Kernel Test Service

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