Hi Wang, [auto build test WARNING on tip/perf/core] [also build test WARNING on v4.4-rc8] [cannot apply to btrfs/next next-20160106] [if your patch is applied to the wrong git tree, please drop us a note to help improving the system]
url: https://github.com/0day-ci/linux/commits/Qu-Wenruo/btrfs-dedup-Introduce-dedup-framework-and-its-header/20160107-091211 config: s390-allmodconfig (attached as .config) reproduce: wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # save the attached .config to linux build tree make.cross ARCH=s390 All warnings (new ones prefixed by >>): fs/btrfs/dedup.c: In function 'btrfs_dedup_calc_hash': >> fs/btrfs/dedup.c:558:1: warning: 'btrfs_dedup_calc_hash' uses dynamic stack >> allocation } ^ vim +/btrfs_dedup_calc_hash +558 fs/btrfs/dedup.c 542 return -ENOMEM; 543 for (i = 0; sectorsize * i < dedup_bs; i++) { 544 char *d; 545 546 /* TODO: Add support for subpage size case */ 547 p = find_get_page(inode->i_mapping, 548 (start >> PAGE_CACHE_SHIFT) + i); 549 WARN_ON(!p); 550 d = kmap_atomic(p); 551 memcpy((data + sectorsize * i), d, sectorsize); 552 kunmap_atomic(d); 553 page_cache_release(p); 554 } 555 ret = hash_data(dedup_info, data, dedup_bs, hash); 556 kfree(data); 557 return ret; > 558 } --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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