On Mon 25-02-19 14:17:10, Qian Cai wrote: > When onlining memory pages, it calls kernel_unmap_linear_page(), > However, it does not call kernel_map_linear_page() while offlining > memory pages. As the result, it triggers a panic below while onlining on > ppc64le as it checks if the pages are mapped before unmapping, > Therefore, let it call kernel_map_linear_page() when setting all pages > as reserved. This really begs for much more explanation. All the pages should be unmapped as they get freed AFAIR. So why do we need a special handing here when this path only offlines free pages? -- Michal Hocko SUSE Labs
