linux-kernel - [ammarfaizi2-block:google/android/kernel/common/android11-kiwi-5.4 2314/9999] mm/page_alloc.c:2741:29: sparse: sparse: Using plain integer as NULL pointer

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Date:   Tue, 25 Jan 2022 06:45:47 +0800
From:   kernel test robot <lkp@...el.com>
To:     Mark Salyzyn <salyzyn@...gle.com>
Cc:     kbuild-all@...ts.01.org, GNU/Weeb Mailing List <gwml@...weeb.org>,
        linux-kernel@...r.kernel.org, Todd Kjos <tkjos@...gle.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Heesub Shin <heesub.shin@...sung.com>,
        Laura Abbott <lauraa@...eaurora.org>,
        Liam Mark <lmark@...eaurora.org>,
        Vinayak Menon <vinmenon@...eaurora.org>,
        Charan Teja Reddy <charante@...eaurora.org>,
        Swathi Sridhar <swatsrid@...eaurora.org>
Subject: [ammarfaizi2-block:google/android/kernel/common/android11-kiwi-5.4
 2314/9999] mm/page_alloc.c:2741:29: sparse: sparse: Using plain integer as
 NULL pointer

tree:   https://github.com/ammarfaizi2/linux-block google/android/kernel/common/android11-kiwi-5.4
head:   7d1d5848183bd1d9086d0572f9af431d3ded407f
commit: b9d3d8f1e991052edb89b0537b8f2e8b2aa941ac [2314/9999] ANDROID: GKI: cma: redirect page allocation to CMA
config: x86_64-randconfig-s022 (https://download.01.org/0day-ci/archive/20220125/202201250617.FDCLmCS1-lkp@intel.com/config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.4-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/android11-kiwi-5.4
        git checkout b9d3d8f1e991052edb89b0537b8f2e8b2aa941ac
        # save the config file to linux build tree
        mkdir build_dir
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=x86_64 SHELL=/bin/bash

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

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