[PATCH 02/15] memblock: Declare scratch memory as CMA

[kernel test robot]

Hi Alexander,

kernel test robot noticed the following build warnings:

[auto build test WARNING on tip/x86/core]
[also build test WARNING on arm64/for-next/core akpm-mm/mm-everything linus/master v6.7-rc5 next-20231213]
[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/Alexander-Graf/mm-memblock-Add-support-for-scratch-memory/20231213-080941
base:   tip/x86/core
patch link:    https://lore.kernel.org/r/20231213000452.88295-3-graf%40amazon.com
patch subject: [PATCH 02/15] memblock: Declare scratch memory as CMA
config: arc-allnoconfig (https://download.01.org/0day-ci/archive/20231213/202312131930.gMiphjju-lkp@intel.com/config)
compiler: arc-elf-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231213/202312131930.gMiphjju-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 at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202312131930.gMiphjju-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> mm/memblock.c:2153:13: warning: 'reserve_scratch_mem' defined but not used [-Wunused-function]
    2153 | static void reserve_scratch_mem(phys_addr_t start, phys_addr_t end)
         |             ^~~~~~~~~~~~~~~~~~~


vim +/reserve_scratch_mem +2153 mm/memblock.c

  2152	
> 2153	static void reserve_scratch_mem(phys_addr_t start, phys_addr_t end)
  2154	{
  2155	#ifdef CONFIG_MEMBLOCK_SCRATCH
  2156		ulong start_pfn = pageblock_start_pfn(PFN_DOWN(start));
  2157		ulong end_pfn = pageblock_align(PFN_UP(end));
  2158		ulong pfn;
  2159	
  2160		for (pfn = start_pfn; pfn < end_pfn; pfn += pageblock_nr_pages) {
  2161			/* Mark as CMA to prevent kernel allocations in it */
  2162			set_pageblock_migratetype(pfn_to_page(pfn), MIGRATE_CMA);
  2163		}
  2164	#endif
  2165	}
  2166	

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