[ammarfaizi2-block:google/android/kernel/common/android-trusty-5.4 4948/6879] mm/page_alloc.c:2741:29: sparse: sparse: Using plain integer as NULL pointer

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

tree:   https://github.com/ammarfaizi2/linux-block google/android/kernel/common/android-trusty-5.4
head:   d556bac5a4d65c759ce3c5a7529aef568f05f650
commit: b9d3d8f1e991052edb89b0537b8f2e8b2aa941ac [4948/6879] ANDROID: GKI: cma: redirect page allocation to CMA
config: i386-randconfig-s003 (https://download.01.org/0day-ci/archive/20220810/202208101652.B2ooOD6c-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-3) 11.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.4-39-gce1a6720-dirty
        # https://github.com/ammarfaizi2/linux-block/commit/b9d3d8f1e991052edb89b0537b8f2e8b2aa941ac
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block google/android/kernel/common/android-trusty-5.4
        git checkout b9d3d8f1e991052edb89b0537b8f2e8b2aa941ac
        # 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=i386 SHELL=/bin/bash

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 >>)
   mm/page_alloc.c:106:1: sparse: sparse: symbol 'pcpu_drain_mutex' was not declared. Should it be static?
>> mm/page_alloc.c:2741:29: sparse: sparse: Using plain integer as NULL pointer
   mm/page_alloc.c:3252:51: sparse: sparse: incorrect type in argument 7 (different base types) @@     expected int cma @@     got restricted gfp_t @@
   mm/page_alloc.c:3252:51: sparse:     expected int cma
   mm/page_alloc.c:3252:51: sparse:     got restricted gfp_t
   mm/page_alloc.c: note: in included file (through include/linux/mm.h):
   include/linux/gfp.h:325:27: sparse: sparse: restricted gfp_t degrades to integer
   include/linux/gfp.h:325:27: sparse: sparse: restricted gfp_t degrades to integer

vim +2741 mm/page_alloc.c

  2736	
  2737	static struct page *__rmqueue_cma(struct zone *zone, unsigned int order,
  2738						int migratetype,
  2739						unsigned int alloc_flags)
  2740	{
> 2741		struct page *page = 0;
  2742	
  2743	retry:
  2744	#ifdef CONFIG_CMA
  2745		if (migratetype == MIGRATE_MOVABLE && !zone->cma_alloc)
  2746			page = __rmqueue_cma_fallback(zone, order);
  2747		else
  2748	#endif
  2749			page = __rmqueue_smallest(zone, order, migratetype);
  2750	
  2751		if (unlikely(!page) && __rmqueue_fallback(zone, order, migratetype,
  2752							  alloc_flags))
  2753			goto retry;
  2754	
  2755		trace_mm_page_alloc_zone_locked(page, order, migratetype);
  2756		return page;
  2757	}
  2758	

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