Re: [PATCH 05/12] mm/madvise: introduce MADV_COLLAPSE sync hugepage collapse

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

Hi Zach,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on hnaz-mm/master]

url:    https://github.com/intel-lab-lkp/linux/commits/Zach-O-Keefe/mm-userspace-hugepage-collapse/20220410-215722
base:   https://github.com/hnaz/linux-mm master
config: mips-randconfig-r002-20220410 (https://download.01.org/0day-ci/archive/20220411/202204110059.a0PLTrVC-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 256c6b0ba14e8a7ab6373b61b7193ea8c0a3651c)
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
        # install mips cross compiling tool for clang build
        # apt-get install binutils-mips-linux-gnu
        # https://github.com/intel-lab-lkp/linux/commit/4f4775a3e4a722525787b2c309032810356473c2
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Zach-O-Keefe/mm-userspace-hugepage-collapse/20220410-215722
        git checkout 4f4775a3e4a722525787b2c309032810356473c2
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=mips SHELL=/bin/bash

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

All errors (new ones prefixed by >>):

>> mm/madvise.c:62:7: error: use of undeclared identifier 'MADV_COLLAPSE'
           case MADV_COLLAPSE:
                ^
   mm/madvise.c:1055:7: error: use of undeclared identifier 'MADV_COLLAPSE'
           case MADV_COLLAPSE:
                ^
   2 errors generated.


vim +/MADV_COLLAPSE +62 mm/madvise.c

    44	
    45	/*
    46	 * Any behaviour which results in changes to the vma->vm_flags needs to
    47	 * take mmap_lock for writing. Others, which simply traverse vmas, need
    48	 * to only take it for reading.
    49	 */
    50	static int madvise_need_mmap_write(int behavior)
    51	{
    52		switch (behavior) {
    53		case MADV_REMOVE:
    54		case MADV_WILLNEED:
    55		case MADV_DONTNEED:
    56		case MADV_DONTNEED_LOCKED:
    57		case MADV_COLD:
    58		case MADV_PAGEOUT:
    59		case MADV_FREE:
    60		case MADV_POPULATE_READ:
    61		case MADV_POPULATE_WRITE:
  > 62		case MADV_COLLAPSE:
    63			return 0;
    64		default:
    65			/* be safe, default to 1. list exceptions explicitly */
    66			return 1;
    67		}
    68	}
    69	

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