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Subjectarch/powerpc/mm/mem.c:53:12: error: no previous prototype for 'create_section_mapping'
Hi Christophe,

FYI, the error/warning still remains.

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 007b350a58754a93ca9fe50c498cc27780171153
commit: b26e8f27253a47bff90972b987112fd8396e9b8d powerpc/mem: Move cache flushing functions into mm/cacheflush.c
date: 3 months ago
config: powerpc64-randconfig-r035-20210630 (attached as .config)
compiler: powerpc64-linux-gcc (GCC) 9.3.0
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=b26e8f27253a47bff90972b987112fd8396e9b8d
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout b26e8f27253a47bff90972b987112fd8396e9b8d
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=powerpc64

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

All errors (new ones prefixed by >>):

>> arch/powerpc/mm/mem.c:53:12: error: no previous prototype for 'create_section_mapping' [-Werror=missing-prototypes]
53 | int __weak create_section_mapping(unsigned long start, unsigned long end,
| ^~~~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors


vim +/create_section_mapping +53 arch/powerpc/mm/mem.c

bc02af93dd2bbd Yasunori Goto 2006-06-27 52
4e00c5affdd4b0 Logan Gunthorpe 2020-04-10 @53 int __weak create_section_mapping(unsigned long start, unsigned long end,
4e00c5affdd4b0 Logan Gunthorpe 2020-04-10 54 int nid, pgprot_t prot)
fecbfabe1dc940 Benjamin Herrenschmidt 2016-07-05 55 {
fecbfabe1dc940 Benjamin Herrenschmidt 2016-07-05 56 return -ENODEV;
fecbfabe1dc940 Benjamin Herrenschmidt 2016-07-05 57 }
fecbfabe1dc940 Benjamin Herrenschmidt 2016-07-05 58

:::::: The code at line 53 was first introduced by commit
:::::: 4e00c5affdd4b04e6392001716333971932f3d0c powerpc/mm: thread pgprot_t through create_section_mapping()

:::::: TO: Logan Gunthorpe <logang@deltatee.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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