On Wed, Apr 14, 2021 at 08:04:21AM +0200, Michal Hocko wrote: > On Tue 13-04-21 14:19:03, Mike Kravetz wrote: > > On 4/13/21 6:23 AM, Michal Hocko wrote: > > The only place where page->private may not be initialized is when we do > > allocations at boot time from memblock. In this case, we will add the > > pages to the free list via put_page/free_huge_page so the appropriate > > flags will be cleared before anyone notices. > > Pages allocated by the bootmem should be pre initialized from the boot, > no?
I guess Mike means: hugetlb_hstate_alloc_pages alloc_bootmem_huge_page __alloc_bootmem_huge_page memblock_alloc_try_nid_raw and AFAICS, memblock_alloc_try_nid_raw() does not zero the memory. Then these pages are initialized in: gather_bootmem_prealloc prep_compound_huge_page prep_new_huge_page But as can be noticed, no one touches page->private when coming from that path. -- Oscar Salvador SUSE L3
