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Subjectarch/mips/boot/compressed/uart-alchemy.c:4:6: warning: no previous prototype for 'putc'
Hi Thomas,

First bad commit (maybe != root cause):

tree: master
head: 9ccce092fc64d19504fa54de4fd659e279cc92e7
commit: 396c7d94c3bbe07ae00c9f694a5c731878843038 MIPS: alchemy: Fix build breakage, if TOUCHSCREEN_WM97XX is disabled
date: 7 months ago
config: mips-randconfig-r023-20210503 (attached as .config)
compiler: mipsel-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
wget -O ~/bin/make.cross
chmod +x ~/bin/make.cross
git remote add linus
git fetch --no-tags linus master
git checkout 396c7d94c3bbe07ae00c9f694a5c731878843038
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross W=1 ARCH=mips

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <>

All warnings (new ones prefixed by >>):

>> arch/mips/boot/compressed/uart-alchemy.c:4:6: warning: no previous prototype for 'putc' [-Wmissing-prototypes]
4 | void putc(char c)
| ^~~~

vim +/putc +4 arch/mips/boot/compressed/uart-alchemy.c

aae7e8da806e15 Manuel Lauss 2010-01-13 3
aae7e8da806e15 Manuel Lauss 2010-01-13 @4 void putc(char c)

:::::: The code at line 4 was first introduced by commit
:::::: aae7e8da806e1536fdee0632a40aaaeed97a2f1b MIPS: Alchemy: debug output for compressed kernels

:::::: TO: Manuel Lauss <>
:::::: CC: Ralf Baechle <>

0-DAY CI Kernel Test Service, Intel Corporation
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