tree: https://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git review-cgwb-4.3-fixes head: 93bcba95270132db0f16c706a784c97d3a6cc74e commit: 93bcba95270132db0f16c706a784c97d3a6cc74e [5/5] writeback: fix incorrect calculation of available memory for memcg domains config: avr32-allnoconfig (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 git checkout 93bcba95270132db0f16c706a784c97d3a6cc74e # save the attached .config to linux build tree make.cross ARCH=avr32 All warnings (new ones prefixed by >>): mm/page-writeback.c: In function 'wb_over_bg_thresh': >> mm/page-writeback.c:1908: warning: 'filepages' is used uninitialized in this function >> mm/page-writeback.c:1908: warning: 'headroom' is used uninitialized in this function mm/page-writeback.c: In function 'balance_dirty_pages_ratelimited': mm/page-writeback.c:1581: warning: 'writeback' is used uninitialized in this function mm/page-writeback.c:1573: note: 'writeback' was declared here mm/page-writeback.c:1582: warning: 'filepages' is used uninitialized in this function mm/page-writeback.c:1573: note: 'filepages' was declared here mm/page-writeback.c:1582: warning: 'headroom' is used uninitialized in this function mm/page-writeback.c:1573: note: 'headroom' was declared here mm/page-writeback.c:1545: warning: 'm_bg_thresh' may be used uninitialized in this function mm/page-writeback.c:1545: note: 'm_bg_thresh' was declared here mm/page-writeback.c:1545: warning: 'm_thresh' may be used uninitialized in this function mm/page-writeback.c:1545: note: 'm_thresh' was declared here mm/page-writeback.c:1545: warning: 'm_dirty' may be used uninitialized in this function mm/page-writeback.c:1545: note: 'm_dirty' was declared here vim +/filepages +1908 mm/page-writeback.c 1892 gdtc->avail = global_dirtyable_memory(); 1893 gdtc->dirty = global_page_state(NR_FILE_DIRTY) + 1894 global_page_state(NR_UNSTABLE_NFS); 1895 domain_dirty_limits(gdtc); 1896 1897 if (gdtc->dirty > gdtc->bg_thresh) 1898 return true; 1899 1900 if (wb_stat(wb, WB_RECLAIMABLE) > __wb_calc_thresh(gdtc)) 1901 return true; 1902 1903 if (mdtc) { 1904 unsigned long filepages, headroom, writeback; 1905 1906 mem_cgroup_wb_stats(wb, &filepages, &headroom, &mdtc->dirty, 1907 &writeback); > 1908 mdtc_calc_avail(mdtc, filepages, headroom); 1909 domain_dirty_limits(mdtc); /* ditto, ignore writeback */ 1910 1911 if (mdtc->dirty > mdtc->bg_thresh) 1912 return true; 1913 1914 if (wb_stat(wb, WB_RECLAIMABLE) > __wb_calc_thresh(mdtc)) 1915 return true; 1916 } --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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