Hi "Christopher, Thank you for the patch! Perhaps something to improve:
[auto build test WARNING on powerpc/next] [also build test WARNING on char-misc/char-misc-testing v5.8-rc5 next-20200716] [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/Christopher-M-Riedl/Use-per-CPU-temporary-mappings-for-patching/20200709-123827 base: https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git next config: powerpc-randconfig-r013-20200717 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project ed6b578040a85977026c93bf4188f996148f3218) 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 powerpc cross compiling tool for clang build # apt-get install binutils-powerpc-linux-gnu # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <l...@intel.com> All warnings (new ones prefixed by >>): >> arch/powerpc/lib/code-patching.c:53:13: warning: no previous prototype for >> function 'poking_init' [-Wmissing-prototypes] void __init poking_init(void) ^ arch/powerpc/lib/code-patching.c:53:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void __init poking_init(void) ^ static 1 warning generated. vim +/poking_init +53 arch/powerpc/lib/code-patching.c 52 > 53 void __init poking_init(void) 54 { 55 spinlock_t *ptl; /* for protecting pte table */ 56 pte_t *ptep; 57 58 /* 59 * Some parts of the kernel (static keys for example) depend on 60 * successful code patching. Code patching under STRICT_KERNEL_RWX 61 * requires this setup - otherwise we cannot patch at all. We use 62 * BUG_ON() here and later since an early failure is preferred to 63 * buggy behavior and/or strange crashes later. 64 */ 65 patching_mm = copy_init_mm(); 66 BUG_ON(!patching_mm); 67 68 /* 69 * In hash we cannot go above DEFAULT_MAP_WINDOW easily. 70 * XXX: Do we want additional bits of entropy for radix? 71 */ 72 patching_addr = (get_random_long() & PAGE_MASK) % 73 (DEFAULT_MAP_WINDOW - PAGE_SIZE); 74 75 ptep = get_locked_pte(patching_mm, patching_addr, &ptl); 76 BUG_ON(!ptep); 77 pte_unmap_unlock(ptep, ptl); 78 } 79 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-...@lists.01.org
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