[android-common:android12-5.4 4/9] drivers/dma-buf/heaps/page_pool.c:236:17: sparse: sparse: symbol 'pool_shrinker' was not declared. Should it be static?

[kernel test robot <lkp@intel.com>]

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Hi John,

First bad commit (maybe != root cause):

tree:   https://android.googlesource.com/kernel/common android12-5.4
head:   82c67a98c7494b4e71dcbea03335509e9ccecfa5
commit: 44008f99d9ca0793e2562967e1da01fa74ee4a41 [4/9] ANDROID: dma-buf: system_heap: Add pagepool support to system heap
config: i386-randconfig-s001-20210812 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.3-348-gf0e6938b-dirty
        git remote add android-common https://android.googlesource.com/kernel/common
        git fetch --no-tags android-common android12-5.4
        git checkout 44008f99d9ca0793e2562967e1da01fa74ee4a41
        # save the attached .config to linux build tree
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=i386 SHELL=/bin/bash drivers/dma-buf/heaps/ kernel/

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


sparse warnings: (new ones prefixed by >>)
>> drivers/dma-buf/heaps/page_pool.c:236:17: sparse: sparse: symbol 'pool_shrinker' was not declared. Should it be static?
   drivers/dma-buf/heaps/page_pool.c:243:5: sparse: sparse: symbol 'dmabuf_page_pool_init_shrinker' was not declared. Should it be static?

vim +/pool_shrinker +236 drivers/dma-buf/heaps/page_pool.c

bd4db96bfc247a John Stultz 2020-10-02  235  
bd4db96bfc247a John Stultz 2020-10-02 @236  struct shrinker pool_shrinker = {
bd4db96bfc247a John Stultz 2020-10-02  237  	.count_objects = dmabuf_page_pool_shrink_count,
bd4db96bfc247a John Stultz 2020-10-02  238  	.scan_objects = dmabuf_page_pool_shrink_scan,
bd4db96bfc247a John Stultz 2020-10-02  239  	.seeks = DEFAULT_SEEKS,
bd4db96bfc247a John Stultz 2020-10-02  240  	.batch = 0,
bd4db96bfc247a John Stultz 2020-10-02  241  };
bd4db96bfc247a John Stultz 2020-10-02  242  

:::::: The code at line 236 was first introduced by commit
:::::: bd4db96bfc247afdaf7a4cfde85fd8147522f3e6 ANDROID: dma-buf: heaps: Add a shrinker controlled page pool

:::::: TO: John Stultz <john.stultz@linaro.org>
:::::: CC: John Stultz <john.stultz@linaro.org>

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

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