[openeuler:OLK-6.6 3064/3064] mm/page_alloc.c:4552 prepare_before_alloc() warn: bitwise AND condition is false here

[openeuler:OLK-6.6 3064/3064] mm/page_alloc.c:4552 prepare_before_alloc() warn: bitwise AND condition is false here

[kernel test robot]

BCC: lkp@intel.com
CC: oe-kbuild-all@lists.linux.dev
TO: kernel@openeuler.org
TO: Wupeng Ma <mawupeng1@huawei.com>

tree:   https://gitee.com/openeuler/kernel.git OLK-6.6
head:   2f6a2b7160d59b59ef2bd08614200d0a2219b54e
commit: 7829f27d03dbdb975be3a72915dc71ac414f2a16 [3064/3064] mm: mem_reliable: Alloc task memory from reliable region
:::::: branch date: 11 hours ago
:::::: commit date: 1 year, 10 months ago
config: arm64-randconfig-r073-20251029 (https://download.01.org/0day-ci/archive/20251030/202510300352.TkdUanUX-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 14.3.0

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Reported-by: Dan Carpenter <error27@gmail.com>
| Closes: https://lore.kernel.org/r/202510300352.TkdUanUX-lkp@intel.com/

smatch warnings:
mm/page_alloc.c:4552 prepare_before_alloc() warn: bitwise AND condition is false here

vim +4552 mm/page_alloc.c

387ba26fb1cb9b Mel Gorman 2021-04-29  4532  
7829f27d03dbdb Ma Wupeng  2024-01-10  4533  static inline void prepare_before_alloc(gfp_t *gfp_mask)
7829f27d03dbdb Ma Wupeng  2024-01-10  4534  {
7829f27d03dbdb Ma Wupeng  2024-01-10  4535  	bool zone_movable;
7829f27d03dbdb Ma Wupeng  2024-01-10  4536  
7829f27d03dbdb Ma Wupeng  2024-01-10  4537  	if (!mem_reliable_is_enabled())
7829f27d03dbdb Ma Wupeng  2024-01-10  4538  		return;
7829f27d03dbdb Ma Wupeng  2024-01-10  4539  
7829f27d03dbdb Ma Wupeng  2024-01-10  4540  	/*
7829f27d03dbdb Ma Wupeng  2024-01-10  4541  	 * memory reliable only handle memory allocation from movable zone
7829f27d03dbdb Ma Wupeng  2024-01-10  4542  	 * (force alloc from non-movable zone or force alloc from movable
7829f27d03dbdb Ma Wupeng  2024-01-10  4543  	 * zone) to get total isolation.
7829f27d03dbdb Ma Wupeng  2024-01-10  4544  	 */
7829f27d03dbdb Ma Wupeng  2024-01-10  4545  	zone_movable = gfp_zone(*gfp_mask & ~GFP_RELIABLE) == ZONE_MOVABLE;
7829f27d03dbdb Ma Wupeng  2024-01-10  4546  	if (!zone_movable)
7829f27d03dbdb Ma Wupeng  2024-01-10  4547  		goto clear_flag;
7829f27d03dbdb Ma Wupeng  2024-01-10  4548  
7829f27d03dbdb Ma Wupeng  2024-01-10  4549  	if (!in_task())
7829f27d03dbdb Ma Wupeng  2024-01-10  4550  		return;
7829f27d03dbdb Ma Wupeng  2024-01-10  4551  
7829f27d03dbdb Ma Wupeng  2024-01-10 @4552  	if ((current->flags & PF_RELIABLE) || is_global_init(current))
7829f27d03dbdb Ma Wupeng  2024-01-10  4553  		*gfp_mask |= GFP_RELIABLE;
7829f27d03dbdb Ma Wupeng  2024-01-10  4554  
7829f27d03dbdb Ma Wupeng  2024-01-10  4555  	return;
7829f27d03dbdb Ma Wupeng  2024-01-10  4556  clear_flag:
7829f27d03dbdb Ma Wupeng  2024-01-10  4557  	*gfp_mask &= ~GFP_RELIABLE;
7829f27d03dbdb Ma Wupeng  2024-01-10  4558  }
7829f27d03dbdb Ma Wupeng  2024-01-10  4559  

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