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Subjectarch/mips/boot/compressed/../../../../lib/lz4/lz4_decompress.c:506:5: warning: no previous prototype for 'LZ4_decompress_safe_forceExtDict'
Hi Randy,

First bad commit (maybe != root cause):

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 89d714ab6043bca7356b5c823f5335f5dce1f930
commit: 5ba3747dbc9ade2d22a8f5bff3c928cb41d35030 regulator: bd71815: add select to fix build
date: 6 months ago
config: mips-randconfig-r015-20211012 (attached as .config)
compiler: mipsel-linux-gcc (GCC) 11.2.0
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://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5ba3747dbc9ade2d22a8f5bff3c928cb41d35030
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout 5ba3747dbc9ade2d22a8f5bff3c928cb41d35030
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=mips

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

All warnings (new ones prefixed by >>):

arch/mips/boot/compressed/decompress.c:40:6: warning: no previous prototype for 'error' [-Wmissing-prototypes]
40 | void error(char *x)
| ^~~~~
In file included from arch/mips/boot/compressed/../../../../lib/decompress_unlz4.c:10,
from arch/mips/boot/compressed/decompress.c:62:
arch/mips/boot/compressed/../../../../lib/lz4/lz4_decompress.c:484:5: warning: no previous prototype for 'LZ4_decompress_safe_withPrefix64k' [-Wmissing-prototypes]
484 | int LZ4_decompress_safe_withPrefix64k(const char *source, char *dest,
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> arch/mips/boot/compressed/../../../../lib/lz4/lz4_decompress.c:506:5: warning: no previous prototype for 'LZ4_decompress_safe_forceExtDict' [-Wmissing-prototypes]
506 | int LZ4_decompress_safe_forceExtDict(const char *source, char *dest,
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/mips/boot/compressed/decompress.c:83:6: warning: no previous prototype for '__stack_chk_fail' [-Wmissing-prototypes]
83 | void __stack_chk_fail(void)
| ^~~~~~~~~~~~~~~~
arch/mips/boot/compressed/decompress.c:88:6: warning: no previous prototype for 'decompress_kernel' [-Wmissing-prototypes]
88 | void decompress_kernel(unsigned long boot_heap_start)
| ^~~~~~~~~~~~~~~~~


vim +/LZ4_decompress_safe_forceExtDict +506 arch/mips/boot/compressed/../../../../lib/lz4/lz4_decompress.c

cffb78b0e0b3a30 Kyungsik Lee 2013-07-08 505
2209fda323e2fd2 Gao Xiang 2018-10-30 @506 int LZ4_decompress_safe_forceExtDict(const char *source, char *dest,
2209fda323e2fd2 Gao Xiang 2018-10-30 507 int compressedSize, int maxOutputSize,
2209fda323e2fd2 Gao Xiang 2018-10-30 508 const void *dictStart, size_t dictSize)
2209fda323e2fd2 Gao Xiang 2018-10-30 509 {
2209fda323e2fd2 Gao Xiang 2018-10-30 510 return LZ4_decompress_generic(source, dest,
2209fda323e2fd2 Gao Xiang 2018-10-30 511 compressedSize, maxOutputSize,
2209fda323e2fd2 Gao Xiang 2018-10-30 512 endOnInputSize, decode_full_block,
2209fda323e2fd2 Gao Xiang 2018-10-30 513 usingExtDict, (BYTE *)dest,
2209fda323e2fd2 Gao Xiang 2018-10-30 514 (const BYTE *)dictStart, dictSize);
2209fda323e2fd2 Gao Xiang 2018-10-30 515 }
2209fda323e2fd2 Gao Xiang 2018-10-30 516

:::::: The code at line 506 was first introduced by commit
:::::: 2209fda323e2fd2a2d0885595fd5097717f8d2aa lib/lz4: update LZ4 decompressor module

:::::: TO: Gao Xiang <gaoxiang25@huawei.com>
:::::: CC: Linus Torvalds <torvalds@linux-foundation.org>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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