Hi Youling, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on linus/master] [also build test WARNING on v5.11-rc6 next-20210125] [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/0day-ci/linux/commits/Youling-Tang/MIPS-crash_dump-c-Simplify-copy_oldmem_page/20210205-174220 base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 61556703b610a104de324e4f061dc6cf7b218b46 config: mips-randconfig-r035-20210205 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project c9439ca36342fb6013187d0a69aef92736951476) 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/0day-ci/linux/commit/b784382bee7f0a7c02539598bfb477bf10f16c85 git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Youling-Tang/MIPS-crash_dump-c-Simplify-copy_oldmem_page/20210205-174220 git checkout b784382bee7f0a7c02539598bfb477bf10f16c85 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=mips If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): >> arch/mips/kernel/crash_dump.c:17:9: warning: no previous prototype for function 'copy_oldmem_page' [-Wmissing-prototypes] ssize_t copy_oldmem_page(unsigned long pfn, char *buf, ^ arch/mips/kernel/crash_dump.c:17:1: note: declare 'static' if the function is not intended to be used outside of this translation unit ssize_t copy_oldmem_page(unsigned long pfn, char *buf, ^ static 1 warning generated. vim +/copy_oldmem_page +17 arch/mips/kernel/crash_dump.c 7aa1c8f47e7e79 Ralf Baechle 2012-10-11 3 7aa1c8f47e7e79 Ralf Baechle 2012-10-11 4 /** 7aa1c8f47e7e79 Ralf Baechle 2012-10-11 5 * copy_oldmem_page - copy one page from "oldmem" 7aa1c8f47e7e79 Ralf Baechle 2012-10-11 6 * @pfn: page frame number to be copied 7aa1c8f47e7e79 Ralf Baechle 2012-10-11 7 * @buf: target memory address for the copy; this can be in kernel address 7aa1c8f47e7e79 Ralf Baechle 2012-10-11 8 * space or user address space (see @userbuf) 7aa1c8f47e7e79 Ralf Baechle 2012-10-11 9 * @csize: number of bytes to copy 7aa1c8f47e7e79 Ralf Baechle 2012-10-11 10 * @offset: offset in bytes into the page (based on pfn) to begin the copy 7aa1c8f47e7e79 Ralf Baechle 2012-10-11 11 * @userbuf: if set, @buf is in user address space, use copy_to_user(), 7aa1c8f47e7e79 Ralf Baechle 2012-10-11 12 * otherwise @buf is in kernel address space, use memcpy(). 7aa1c8f47e7e79 Ralf Baechle 2012-10-11 13 * 7aa1c8f47e7e79 Ralf Baechle 2012-10-11 14 * Copy a page from "oldmem". For this page, there is no pte mapped 7aa1c8f47e7e79 Ralf Baechle 2012-10-11 15 * in the current kernel. 7aa1c8f47e7e79 Ralf Baechle 2012-10-11 16 */ 7aa1c8f47e7e79 Ralf Baechle 2012-10-11 @17 ssize_t copy_oldmem_page(unsigned long pfn, char *buf, --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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