Re: [RFC PATCH v2 2/5] userfaultfd: introduce access-likely mode for copy/wp operations

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

Hi Nadav,

[FYI, it's a private test report for your RFC patch.]
[auto build test WARNING on akpm-mm/mm-everything]
[also build test WARNING on linus/master v5.19-rc2 next-20220617]
[cannot apply to shuah-kselftest/next]
[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]

url:    https://github.com/intel-lab-lkp/linux/commits/Nadav-Amit/userfaultfd-support-access-write-hints/20220620-150942
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
config: hexagon-buildonly-randconfig-r001-20220620 (https://download.01.org/0day-ci/archive/20220620/202206201856.LMF3y588-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project af6d2a0b6825e71965f3e2701a63c239fa0ad70f)
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
        # https://github.com/intel-lab-lkp/linux/commit/ad1b8120bf00d273f9c786fe63c5c1fbcd7ff43c
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Nadav-Amit/userfaultfd-support-access-write-hints/20220620-150942
        git checkout ad1b8120bf00d273f9c786fe63c5c1fbcd7ff43c
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=hexagon SHELL=/bin/bash

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

All warnings (new ones prefixed by >>):

>> mm/userfaultfd.c:700:23: warning: parameter 'uffd_flags' set but not used [-Wunused-but-set-parameter]
                          uffd_flags_t uffd_flags)
                                       ^
   mm/userfaultfd.c:711:23: warning: parameter 'uffd_flags' set but not used [-Wunused-but-set-parameter]
                          uffd_flags_t uffd_flags)
                                       ^
   2 warnings generated.


vim +/uffd_flags +700 mm/userfaultfd.c

c1a4de99fada21 Andrea Arcangeli 2015-09-04  697  
c1a4de99fada21 Andrea Arcangeli 2015-09-04  698  ssize_t mfill_zeropage(struct mm_struct *dst_mm, unsigned long start,
0b36999093ff22 Nadav Amit       2022-06-19  699  		       unsigned long len, atomic_t *mmap_changing,
0b36999093ff22 Nadav Amit       2022-06-19 @700  		       uffd_flags_t uffd_flags)
c1a4de99fada21 Andrea Arcangeli 2015-09-04  701  {
ad1b8120bf00d2 Nadav Amit       2022-06-19  702  	/* There is no cost for setting the access bit of a zeropage */
ad1b8120bf00d2 Nadav Amit       2022-06-19  703  	uffd_flags |= UFFD_FLAGS_ACCESS_LIKELY;
ad1b8120bf00d2 Nadav Amit       2022-06-19  704  
f619147104c8ea Axel Rasmussen   2021-05-04  705  	return __mcopy_atomic(dst_mm, start, 0, len, MCOPY_ATOMIC_ZEROPAGE,
f619147104c8ea Axel Rasmussen   2021-05-04  706  			      mmap_changing, 0);
f619147104c8ea Axel Rasmussen   2021-05-04  707  }
f619147104c8ea Axel Rasmussen   2021-05-04  708  

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp