Re: [PATCH v1 1/2] drivers/base/memory: don't store phys_device in memory blocks

[kernel test robot]

Hi David,

I love your patch! Perhaps something to improve:

[auto build test WARNING on linux/master]
[also build test WARNING on driver-core/driver-core-testing next-20210125]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/David-Hildenbrand/drivers-base-memory-clarify-some-memory-block-properties/20210201-185331
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 2ab38c17aac10bf55ab3efde4c4db3893d8691d2
config: x86_64-randconfig-s031-20210201 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.3-215-g0fb77bb6-dirty
        # https://github.com/0day-ci/linux/commit/614341d29c44f8965a604b9fd5d09eb0b652864c
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review David-Hildenbrand/drivers-base-memory-clarify-some-memory-block-properties/20210201-185331
        git checkout 614341d29c44f8965a604b9fd5d09eb0b652864c
        # save the attached .config to linux build tree
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=x86_64 

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

All warnings (new ones prefixed by >>):

   drivers/base/memory.c: In function 'init_memory_block':
>> drivers/base/memory.c:573:16: warning: variable 'start_pfn' set but not used [-Wunused-but-set-variable]
     573 |  unsigned long start_pfn;
         |                ^~~~~~~~~


vim +/start_pfn +573 drivers/base/memory.c

96b2c0fc8e74a6 Nathan Fontenot   2013-06-04  569  
40ba2cde77e764 Wei Yang          2020-06-23  570  static int init_memory_block(unsigned long block_id, unsigned long state)
e4619c857d1d76 Nathan Fontenot   2010-10-19  571  {
0c2c99b1b8ab5d Nathan Fontenot   2011-01-20  572  	struct memory_block *mem;
e4619c857d1d76 Nathan Fontenot   2010-10-19 @573  	unsigned long start_pfn;
e4619c857d1d76 Nathan Fontenot   2010-10-19  574  	int ret = 0;
e4619c857d1d76 Nathan Fontenot   2010-10-19  575  
dd625285910d3c David Hildenbrand 2019-07-18  576  	mem = find_memory_block_by_id(block_id);
db051a0dac13db David Hildenbrand 2019-07-18  577  	if (mem) {
db051a0dac13db David Hildenbrand 2019-07-18  578  		put_device(&mem->dev);
db051a0dac13db David Hildenbrand 2019-07-18  579  		return -EEXIST;
db051a0dac13db David Hildenbrand 2019-07-18  580  	}
0c2c99b1b8ab5d Nathan Fontenot   2011-01-20  581  	mem = kzalloc(sizeof(*mem), GFP_KERNEL);
e4619c857d1d76 Nathan Fontenot   2010-10-19  582  	if (!mem)
e4619c857d1d76 Nathan Fontenot   2010-10-19  583  		return -ENOMEM;
e4619c857d1d76 Nathan Fontenot   2010-10-19  584  
1811582587c43b David Hildenbrand 2019-07-18  585  	mem->start_section_nr = block_id * sections_per_block;
e4619c857d1d76 Nathan Fontenot   2010-10-19  586  	mem->state = state;
d33601644cd3b0 Nathan Fontenot   2011-01-20  587  	start_pfn = section_nr_to_pfn(mem->start_section_nr);
d84f2f5a755208 David Hildenbrand 2019-09-23  588  	mem->nid = NUMA_NO_NODE;
e4619c857d1d76 Nathan Fontenot   2010-10-19  589  
0c2c99b1b8ab5d Nathan Fontenot   2011-01-20  590  	ret = register_memory(mem);
0c2c99b1b8ab5d Nathan Fontenot   2011-01-20  591  
0c2c99b1b8ab5d Nathan Fontenot   2011-01-20  592  	return ret;
0c2c99b1b8ab5d Nathan Fontenot   2011-01-20  593  }
0c2c99b1b8ab5d Nathan Fontenot   2011-01-20  594  

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