Re: [PATCH V2] mips: kernel: fix detect_memory_region() function

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

Hi Shiji,

kernel test robot noticed the following build warnings:

[auto build test WARNING on soc/for-next]
[also build test WARNING on linus/master v6.10-rc5 next-20240627]
[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#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Shiji-Yang/mips-kernel-fix-detect_memory_region-function/20240626-070033
base:   https://git.kernel.org/pub/scm/linux/kernel/git/soc/soc.git for-next
patch link:    https://lore.kernel.org/r/TYCP286MB089598ABD1E2F66003D71EB8BCD52%40TYCP286MB0895.JPNP286.PROD.OUTLOOK.COM
patch subject: [PATCH V2] mips: kernel: fix detect_memory_region() function
config: mips-randconfig-r113-20240628 (https://download.01.org/0day-ci/archive/20240628/202406282354.0hGuOKo0-lkp@intel.com/config)
compiler: clang version 15.0.7 (https://github.com/llvm/llvm-project 8dfdcc7b7bf66834a761bd8de445840ef68e4d1a)
reproduce: (https://download.01.org/0day-ci/archive/20240628/202406282354.0hGuOKo0-lkp@intel.com/reproduce)

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>
| Closes: https://lore.kernel.org/oe-kbuild-all/202406282354.0hGuOKo0-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> arch/mips/kernel/setup.c:104:53: sparse: sparse: incorrect type in argument 2 (different address spaces) @@     expected void volatile [noderef] __iomem *mem @@     got void *dm @@
   arch/mips/kernel/setup.c:104:53: sparse:     expected void volatile [noderef] __iomem *mem
   arch/mips/kernel/setup.c:104:53: sparse:     got void *dm
>> arch/mips/kernel/setup.c:105:33: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected void const volatile [noderef] __iomem *mem @@     got void *dm @@
   arch/mips/kernel/setup.c:105:33: sparse:     expected void const volatile [noderef] __iomem *mem
   arch/mips/kernel/setup.c:105:33: sparse:     got void *dm
>> arch/mips/kernel/setup.c:105:55: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected void const volatile [noderef] __iomem *mem @@     got void * @@
   arch/mips/kernel/setup.c:105:55: sparse:     expected void const volatile [noderef] __iomem *mem
   arch/mips/kernel/setup.c:105:55: sparse:     got void *
   arch/mips/kernel/setup.c:106:62: sparse: sparse: incorrect type in argument 2 (different address spaces) @@     expected void volatile [noderef] __iomem *mem @@     got void *dm @@
   arch/mips/kernel/setup.c:106:62: sparse:     expected void volatile [noderef] __iomem *mem
   arch/mips/kernel/setup.c:106:62: sparse:     got void *dm
   arch/mips/kernel/setup.c:107:41: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected void const volatile [noderef] __iomem *mem @@     got void *dm @@
   arch/mips/kernel/setup.c:107:41: sparse:     expected void const volatile [noderef] __iomem *mem
   arch/mips/kernel/setup.c:107:41: sparse:     got void *dm
   arch/mips/kernel/setup.c:107:63: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected void const volatile [noderef] __iomem *mem @@     got void * @@
   arch/mips/kernel/setup.c:107:63: sparse:     expected void const volatile [noderef] __iomem *mem
   arch/mips/kernel/setup.c:107:63: sparse:     got void *
   arch/mips/kernel/setup.c: note: in included file (through include/linux/mmzone.h, include/linux/gfp.h, include/linux/xarray.h, ...):
   include/linux/page-flags.h:240:46: sparse: sparse: self-comparison always evaluates to false
   include/linux/page-flags.h:240:46: sparse: sparse: self-comparison always evaluates to false

vim +104 arch/mips/kernel/setup.c

    97	
    98	void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max)
    99	{
   100		void *dm = (void *)KSEG1ADDR(&detect_magic);
   101		phys_addr_t size;
   102	
   103		for (size = sz_min; size < sz_max; size <<= 1) {
 > 104			__raw_writel(MIPS_MEM_TEST_PATTERN, dm);
 > 105			if (__raw_readl(dm) == __raw_readl(dm + size)) {
   106				__raw_writel(~MIPS_MEM_TEST_PATTERN, dm);
   107				if (__raw_readl(dm) == __raw_readl(dm + size))
   108					break;
   109			}
   110		}
   111	
   112		pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n",
   113			((unsigned long long) size) / SZ_1M,
   114			(unsigned long long) start,
   115			((unsigned long long) sz_min) / SZ_1M,
   116			((unsigned long long) sz_max) / SZ_1M);
   117	
   118		memblock_add(start, size);
   119	}
   120	#endif /* CONFIG_64BIT */
   121	

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