Re: [PATCH V2] arm64/hugetlb: Reserve CMA areas for gigantic pages on 16K and 64K configs

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

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Hi Anshuman,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on v5.8-rc3]
[also build test WARNING on next-20200629]
[cannot apply to arm64/for-next/core]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use  as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Anshuman-Khandual/arm64-hugetlb-Reserve-CMA-areas-for-gigantic-pages-on-16K-and-64K-configs/20200629-144736
base:    9ebcfadb0610322ac537dd7aa5d9cbc2b2894c68
config: arm64-defconfig (attached as .config)
compiler: aarch64-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm64 

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

All warnings (new ones prefixed by >>):

>> arch/arm64/mm/hugetlbpage.c:40:13: warning: no previous prototype for 'arm64_hugetlb_cma_reserve' [-Wmissing-prototypes]
      40 | void __init arm64_hugetlb_cma_reserve(void)
         |             ^~~~~~~~~~~~~~~~~~~~~~~~~

vim +/arm64_hugetlb_cma_reserve +40 arch/arm64/mm/hugetlbpage.c

    21	
    22	/*
    23	 * HugeTLB Support Matrix
    24	 *
    25	 * ---------------------------------------------------
    26	 * | Page Size | CONT PTE |  PMD  | CONT PMD |  PUD  |
    27	 * ---------------------------------------------------
    28	 * |     4K    |   64K    |   2M  |    32M   |   1G  |
    29	 * |    16K    |    2M    |  32M  |     1G   |       |
    30	 * |    64K    |    2M    | 512M  |    16G   |       |
    31	 * ---------------------------------------------------
    32	 */
    33	
    34	/*
    35	 * Reserve CMA areas for the largest supported gigantic
    36	 * huge page when requested. Any other smaller gigantic
    37	 * huge pages could still be served from those areas.
    38	 */
    39	#ifdef CONFIG_CMA
  > 40	void __init arm64_hugetlb_cma_reserve(void)
    41	{
    42		int order;
    43	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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