tree:   https://github.com/ammarfaizi2/linux-block google/android/kernel/common/android12-5.4
head:   61c005f0f1663789612bbe039932620f51779526
commit: 44008f99d9ca0793e2562967e1da01fa74ee4a41 [2811/9999] ANDROID: dma-buf: system_heap: Add pagepool support to system heap
config: x86_64-randconfig-s023
compiler: gcc-11 (Debian 11.3.0-8) 11.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.4-39-gce1a6720-dirty
        # https://github.com/ammarfaizi2/linux-block/commit/44008f99d9ca0793e2562967e1da01fa74ee4a41
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block google/android/kernel/common/android12-5.4
        git checkout 44008f99d9ca0793e2562967e1da01fa74ee4a41
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/dma-buf/heaps/

If you fix the issue, kindly add following tag where applicable
| 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>

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