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Wysocki" , Petr Mladek , Mario Limonciello , Marcos Paulo de Souza , Alexander Graf , Steven Chen , Yan Zhao , kexec@lists.infradead.org, linux-kernel@vger.kernel.org Cc: llvm@lists.linux.dev, oe-kbuild-all@lists.linux.dev, Linux Memory Management List , Gunnar Kudrjavets Subject: Re: [PATCH] kexec_core: Remove superfluous page offset handling in segment loading Message-ID: <202509112118.1NElSKNk-lkp@intel.com> References: <20250910163116.49148-1-jbouron@amazon.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250910163116.49148-1-jbouron@amazon.com> X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 959E880008 X-Stat-Signature: 9wzrsyscwa1zn8diwmoj3byiqkygokfy X-Rspam-User: X-HE-Tag: 1757597092-605255 X-HE-Meta: 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 ewvlTWLx rKa8Tmpr1HDGDQObSAWJWea6bUdovI5lCE5tGyMTkhAKwDhKw6jFtnjjglKa33CkXYsSFyAqE6gDlrfx1dkFMFqePnKzoCTgem0TTEI1XPmPxnHF/g8cM3vYUh18hf9jXe95PKECZpNoIC+zyXwTEQGUkhoLvBjh55UC/kT0U2gm98LMM7JSicGX4MzYpPOFDVzD3MqF9Oz7FSEJ3/buc4C2EdfgxYeIntZOIxkGDnOmHsf/BeD0Ed5Ujqw+BR2CNVzgckr6QeYNx+hozZ6FTvq0q3/zHbepKn6giiTImLUPbavHsbtD6VJqhy/9rj3IYECDSgAOlvnGi5dhEiobh/3CNTJfyE2UHYvmED5cbgxCnLh7oATHpOjUrxmBeXk911woLu1aPWl96lfyKwYAvAQqjri761AwwdGVMGzBIuXmr+c0= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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-lkp@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-lkp@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 | Closes: https://lore.kernel.org/oe-kbuild-all/202509112118.1NElSKNk-lkp@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