Re: [PATCH 1/2] libnvdimm, pmem: fix 'pfn' support for section-misaligned namespaces

[kbuild test robot]

Hi Dan,

[auto build test WARNING on v4.5-rc6]
[also build test WARNING on next-20160229]
[cannot apply to linux-nvdimm/libnvdimm-for-next]
[if your patch is applied to the wrong git tree, please drop us a note to help improving the system]

url:    https://github.com/0day-ci/linux/commits/Dan-Williams/devm_memremap_pages-vs-section-misaligned-pmem/20160301-105936
config: i386-randconfig-x007-201609 (attached as .config)
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All warnings (new ones prefixed by >>):

   drivers/nvdimm/pmem.c: In function 'init_altmap_reserve':
>> drivers/nvdimm/pmem.c:375:16: warning: unused variable 'base_pfn' [-Wunused-variable]
     unsigned long base_pfn = __phys_to_pfn(base);
                   ^

vim +/base_pfn +375 drivers/nvdimm/pmem.c

   359	/*
   360	 * We hotplug memory at section granularity, pad the reserved area from
   361	 * the previous section base to the namespace base address.
   362	 */
   363	static unsigned long init_altmap_base(resource_size_t base)
   364	{
   365		unsigned long base_pfn = __phys_to_pfn(base);
   366	
   367	#ifdef CONFIG_SPARSEMEM
   368		base_pfn = SECTION_ALIGN_DOWN(base_pfn);
   369	#endif
   370		return base_pfn;
   371	}
   372	
   373	static unsigned long init_altmap_reserve(resource_size_t base)
   374	{
 > 375		unsigned long base_pfn = __phys_to_pfn(base);
   376		unsigned long reserve = __phys_to_pfn(SZ_8K);
   377	
   378	#ifdef CONFIG_SPARSEMEM
   379		reserve += base_pfn - SECTION_ALIGN_DOWN(base_pfn);
   380	#endif
   381		return reserve;
   382	}
   383	

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