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SubjectRe: [PATCH net-next v4 1/2] net: Add a WWAN subsystem
Hi Loic,

I love your patch! Perhaps something to improve:

[auto build test WARNING on net-next/master]

url: https://github.com/0day-ci/linux/commits/Loic-Poulain/net-Add-a-WWAN-subsystem/20210312-003256
base: https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git 34bb975126419e86bc3b95e200dc41de6c6ca69c
config: m68k-allmodconfig (attached as .config)
compiler: m68k-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://github.com/0day-ci/linux/commit/259571a34d6f035f99a8343c5fcd12b6dfc92c40
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Loic-Poulain/net-Add-a-WWAN-subsystem/20210312-003256
git checkout 259571a34d6f035f99a8343c5fcd12b6dfc92c40
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=m68k

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 >>):

>> drivers/net/wwan/wwan_core.c:22:21: warning: no previous prototype for '__wwan_find_by_parent' [-Wmissing-prototypes]
22 | struct wwan_device *__wwan_find_by_parent(struct device *parent)
| ^~~~~~~~~~~~~~~~~~~~~


vim +/__wwan_find_by_parent +22 drivers/net/wwan/wwan_core.c

21
> 22 struct wwan_device *__wwan_find_by_parent(struct device *parent)
23 {
24 struct wwan_device *wwandev;
25
26 if (!parent)
27 return NULL;
28
29 list_for_each_entry(wwandev, &wwan_list, list) {
30 if (wwandev->dev.parent == parent)
31 return wwandev;
32 }
33
34 return NULL;
35 }
36

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