Hi Justinien, kernel test robot noticed the following build warnings:
[auto build test WARNING on akpm-mm/mm-everything] [also build test WARNING on linus/master v6.17-rc5 next-20250911] [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/Justinien-Bouron/kexec_core-Remove-superfluous-page-offset-handling-in-segment-loading/20250911-003354 base: https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything patch link: https://lore.kernel.org/r/20250910163116.49148-1-jbouron%40amazon.com patch subject: [PATCH] kexec_core: Remove superfluous page offset handling in segment loading config: x86_64-buildonly-randconfig-004-20250911 (https://download.01.org/0day-ci/archive/20250911/202509112118.1nelsknk-...@intel.com/config) compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250911/202509112118.1nelsknk-...@intel.com/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <l...@intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202509112118.1nelsknk-...@intel.com/ All warnings (new ones prefixed by >>): >> kernel/kexec_core.c:745:16: warning: variable 'maddr' set but not used >> [-Wunused-but-set-variable] 745 | unsigned long maddr; | ^ 1 warning generated. vim +/maddr +745 kernel/kexec_core.c 2965faa5e03d1e Dave Young 2015-09-09 739 07d24902977e47 Alexander Graf 2025-06-10 740 static int kimage_load_cma_segment(struct kimage *image, int idx) 07d24902977e47 Alexander Graf 2025-06-10 741 { 07d24902977e47 Alexander Graf 2025-06-10 742 struct kexec_segment *segment = &image->segment[idx]; 07d24902977e47 Alexander Graf 2025-06-10 743 struct page *cma = image->segment_cma[idx]; 07d24902977e47 Alexander Graf 2025-06-10 744 char *ptr = page_address(cma); 07d24902977e47 Alexander Graf 2025-06-10 @745 unsigned long maddr; 07d24902977e47 Alexander Graf 2025-06-10 746 size_t ubytes, mbytes; 07d24902977e47 Alexander Graf 2025-06-10 747 int result = 0; 07d24902977e47 Alexander Graf 2025-06-10 748 unsigned char __user *buf = NULL; 07d24902977e47 Alexander Graf 2025-06-10 749 unsigned char *kbuf = NULL; 07d24902977e47 Alexander Graf 2025-06-10 750 07d24902977e47 Alexander Graf 2025-06-10 751 if (image->file_mode) 07d24902977e47 Alexander Graf 2025-06-10 752 kbuf = segment->kbuf; 07d24902977e47 Alexander Graf 2025-06-10 753 else 07d24902977e47 Alexander Graf 2025-06-10 754 buf = segment->buf; 07d24902977e47 Alexander Graf 2025-06-10 755 ubytes = segment->bufsz; 07d24902977e47 Alexander Graf 2025-06-10 756 mbytes = segment->memsz; 07d24902977e47 Alexander Graf 2025-06-10 757 maddr = segment->mem; 07d24902977e47 Alexander Graf 2025-06-10 758 07d24902977e47 Alexander Graf 2025-06-10 759 /* Then copy from source buffer to the CMA one */ 07d24902977e47 Alexander Graf 2025-06-10 760 while (mbytes) { 07d24902977e47 Alexander Graf 2025-06-10 761 size_t uchunk, mchunk; 07d24902977e47 Alexander Graf 2025-06-10 762 b4cdefb6ef1453 Justinien Bouron 2025-09-10 763 mchunk = min_t(size_t, mbytes, PAGE_SIZE); 07d24902977e47 Alexander Graf 2025-06-10 764 uchunk = min(ubytes, mchunk); 07d24902977e47 Alexander Graf 2025-06-10 765 07d24902977e47 Alexander Graf 2025-06-10 766 if (uchunk) { 07d24902977e47 Alexander Graf 2025-06-10 767 /* For file based kexec, source pages are in kernel memory */ 07d24902977e47 Alexander Graf 2025-06-10 768 if (image->file_mode) 07d24902977e47 Alexander Graf 2025-06-10 769 memcpy(ptr, kbuf, uchunk); 07d24902977e47 Alexander Graf 2025-06-10 770 else 07d24902977e47 Alexander Graf 2025-06-10 771 result = copy_from_user(ptr, buf, uchunk); 07d24902977e47 Alexander Graf 2025-06-10 772 ubytes -= uchunk; 07d24902977e47 Alexander Graf 2025-06-10 773 if (image->file_mode) 07d24902977e47 Alexander Graf 2025-06-10 774 kbuf += uchunk; 07d24902977e47 Alexander Graf 2025-06-10 775 else 07d24902977e47 Alexander Graf 2025-06-10 776 buf += uchunk; 07d24902977e47 Alexander Graf 2025-06-10 777 } 07d24902977e47 Alexander Graf 2025-06-10 778 07d24902977e47 Alexander Graf 2025-06-10 779 if (result) { 07d24902977e47 Alexander Graf 2025-06-10 780 result = -EFAULT; 07d24902977e47 Alexander Graf 2025-06-10 781 goto out; 07d24902977e47 Alexander Graf 2025-06-10 782 } 07d24902977e47 Alexander Graf 2025-06-10 783 07d24902977e47 Alexander Graf 2025-06-10 784 ptr += mchunk; 07d24902977e47 Alexander Graf 2025-06-10 785 maddr += mchunk; 07d24902977e47 Alexander Graf 2025-06-10 786 mbytes -= mchunk; 07d24902977e47 Alexander Graf 2025-06-10 787 07d24902977e47 Alexander Graf 2025-06-10 788 cond_resched(); 07d24902977e47 Alexander Graf 2025-06-10 789 } 07d24902977e47 Alexander Graf 2025-06-10 790 07d24902977e47 Alexander Graf 2025-06-10 791 /* Clear any remainder */ 07d24902977e47 Alexander Graf 2025-06-10 792 memset(ptr, 0, mbytes); 07d24902977e47 Alexander Graf 2025-06-10 793 07d24902977e47 Alexander Graf 2025-06-10 794 out: 07d24902977e47 Alexander Graf 2025-06-10 795 return result; 07d24902977e47 Alexander Graf 2025-06-10 796 } 07d24902977e47 Alexander Graf 2025-06-10 797 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
