[android-common:android12-5.10 3/5] drivers/dma-buf/heaps/page_pool.c:242:5: warning: no previous prototype for function 'dmabuf_page_pool_init_shrinker'

[android-common:android12-5.10 3/5] drivers/dma-buf/heaps/page_pool.c:242:5: warning: no previous prototype for function 'dmabuf_page_pool_init_shrinker'

[kernel test robot]

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Hi John,

First bad commit (maybe != root cause):

tree:   https://android.googlesource.com/kernel/common android12-5.10
head:   d50b67ac7551b81ae82e70c6f2811073ba3575ba
commit: 23762f02e172f146ccd160e36ed43483f2304aaf [3/5] ANDROID: dma-buf: system_heap: Add pagepool support to system heap
config: arm64-randconfig-r025-20210209 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project c9439ca36342fb6013187d0a69aef92736951476)
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
        # install arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        git remote add android-common https://android.googlesource.com/kernel/common
        git fetch --no-tags android-common android12-5.10
        git checkout 23762f02e172f146ccd160e36ed43483f2304aaf
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm64 

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/dma-buf/heaps/page_pool.c:242:5: warning: no previous prototype for function 'dmabuf_page_pool_init_shrinker' [-Wmissing-prototypes]
   int dmabuf_page_pool_init_shrinker(void)
       ^
   drivers/dma-buf/heaps/page_pool.c:242:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int dmabuf_page_pool_init_shrinker(void)
   ^
   static 
   1 warning generated.


vim +/dmabuf_page_pool_init_shrinker +242 drivers/dma-buf/heaps/page_pool.c

e7dac4c3231c0e John Stultz 2020-10-02  241  
e7dac4c3231c0e John Stultz 2020-10-02 @242  int dmabuf_page_pool_init_shrinker(void)

:::::: The code at line 242 was first introduced by commit
:::::: e7dac4c3231c0e8adeef8dbb732b2cde7c162b14 ANDROID: dma-buf: heaps: Add a shrinker controlled page pool

:::::: TO: John Stultz <john.stultz@linaro.org>
:::::: CC: Hridya Valsaraju <hridya@google.com>

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

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