I am getting mm/compaction.c: In function 'isolate_freepages_block': mm/compaction.c:469:4: error: implicit declaration of function 'pageblock_skip_persistent' [-Werror=implicit-function-declaration] if (pageblock_skip_persistent(page, order)) { ^ mm/compaction.c:470:5: error: implicit declaration of function 'set_pageblock_skip' [-Werror=implicit-function-declaration] set_pageblock_skip(page);
when compaction is disabled because isolate_freepages_block is defined also when CONFIG_COMPACTION=n. I haven't checked how to fix this properly yet. -- Michal Hocko SUSE Labs