Hi John,

First bad commit (maybe != root cause):

tree:   https://github.com/ammarfaizi2/linux-block google/android/kernel/common/android12-5.4
head:   61c005f0f1663789612bbe039932620f51779526
commit: e3919bfeb0066ab9b5f9765e5610b95672990e64 [2812/9999] ANDROID: dma-buf: system_heap: Add deferred freeing to the system heap
config: x86_64-randconfig-s023
compiler: gcc-11 (Debian 11.3.0-5) 11.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.4-39-gce1a6720-dirty
        # https://github.com/ammarfaizi2/linux-block/commit/e3919bfeb0066ab9b5f9765e5610b95672990e64
        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 e3919bfeb0066ab9b5f9765e5610b95672990e64
        # 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/ init/

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/deferred-free-helper.c:23:19: sparse: sparse: symbol 'freelist_waitqueue' was not declared. Should it be static?
>> drivers/dma-buf/heaps/deferred-free-helper.c:24:20: sparse: sparse: symbol 'freelist_task' was not declared. Should it be static?

vim +/freelist_waitqueue +23 drivers/dma-buf/heaps/deferred-free-helper.c

bd1639945c3029 John Stultz 2020-12-09  20  
bd1639945c3029 John Stultz 2020-12-09  21  static LIST_HEAD(free_list);
bd1639945c3029 John Stultz 2020-12-09  22  static size_t list_nr_pages;
bd1639945c3029 John Stultz 2020-12-09 @23  wait_queue_head_t freelist_waitqueue;
bd1639945c3029 John Stultz 2020-12-09 @24  struct task_struct *freelist_task;
bd1639945c3029 John Stultz 2020-12-09  25  static DEFINE_SPINLOCK(free_list_lock);
bd1639945c3029 John Stultz 2020-12-09  26  

:::::: The code at line 23 was first introduced by commit
:::::: bd1639945c30298e4bea2b611d6b0cd08d3cdd98 ANDROID: dma-buf: heaps: Add deferred-free-helper library code

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

-- 
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https://01.org/lkp