On Thu 10-05-18 07:53:56, Pavel Tatashin wrote: [...] > Here is a sample path, where translation is required, that occurs before > mm_init(): > > start_kernel() > trap_init() > setup_cpu_entry_areas() > setup_cpu_entry_area(cpu) > get_cpu_gdt_paddr(cpu) > per_cpu_ptr_to_phys(addr) > pcpu_addr_to_page(addr) > virt_to_page(addr) > pfn_to_page(__pa(addr) >> PAGE_SHIFT)
Thanks that helped me to see the problem. On the other hand isn't this a bit of an overkill? AFAICS this affects only NEED_PER_CPU_KM which is !SMP and DEFERRED_STRUCT_PAGE_INIT makes only very limited sense on UP, right? Or do we have more such places? -- Michal Hocko SUSE Labs
