Re: [PATCH 4/4] mm: vmalloc: convert vread() to vread_iter()

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

Hi Lorenzo,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on akpm-mm/mm-everything]
[also build test WARNING on linus/master v6.3-rc2 next-20230317]
[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/Lorenzo-Stoakes/fs-proc-kcore-Avoid-bounce-buffer-for-ktext-data/20230319-082147
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/119871ea9507eac7be5d91db38acdb03981e049e.1679183626.git.lstoakes%40gmail.com
patch subject: [PATCH 4/4] mm: vmalloc: convert vread() to vread_iter()
config: sh-randconfig-r013-20230319 (https://download.01.org/0day-ci/archive/20230319/202303191017.vsaaDpyw-lkp@intel.com/config)
compiler: sh4-linux-gcc (GCC) 12.1.0
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
        # https://github.com/intel-lab-lkp/linux/commit/a28f374d35bd294a529fcba0b69c8b0e2b66fa6c
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Lorenzo-Stoakes/fs-proc-kcore-Avoid-bounce-buffer-for-ktext-data/20230319-082147
        git checkout a28f374d35bd294a529fcba0b69c8b0e2b66fa6c
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=sh olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=sh SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202303191017.vsaaDpyw-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> mm/nommu.c:201:6: warning: no previous prototype for 'vread' [-Wmissing-prototypes]
     201 | long vread(char *buf, char *addr, unsigned long count)
         |      ^~~~~


vim +/vread +201 mm/nommu.c

^1da177e4c3f41 Linus Torvalds 2005-04-16  200  
^1da177e4c3f41 Linus Torvalds 2005-04-16 @201  long vread(char *buf, char *addr, unsigned long count)
^1da177e4c3f41 Linus Torvalds 2005-04-16  202  {
9bde916bc73255 Chen Gang      2013-07-03  203  	/* Don't allow overflow */
9bde916bc73255 Chen Gang      2013-07-03  204  	if ((unsigned long) buf + count < count)
9bde916bc73255 Chen Gang      2013-07-03  205  		count = -(unsigned long) buf;
9bde916bc73255 Chen Gang      2013-07-03  206  
^1da177e4c3f41 Linus Torvalds 2005-04-16  207  	memcpy(buf, addr, count);
^1da177e4c3f41 Linus Torvalds 2005-04-16  208  	return count;
^1da177e4c3f41 Linus Torvalds 2005-04-16  209  }
^1da177e4c3f41 Linus Torvalds 2005-04-16  210  

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https://github.com/intel/lkp-tests