On 17.03.23 16:35, Kirill A. Shutemov wrote:
Normal page init path frees pages during the boot in MAX_ORDER chunks,
but deferred page init path does it in pageblock blocks.
Change deferred page init path to work in MAX_ORDER blocks.
For cases when pageblock is larger than MAX_ORDER, set migrate type to
MIGRATE_MOVABLE for all pageblocks covered by the page.
See
commit b3d40a2b6d10c9d0424d2b398bf962fb6adad87e
Author: David Hildenbrand <david@xxxxxxxxxx>
Date: Tue Mar 22 14:43:20 2022 -0700
mm: enforce pageblock_order < MAX_ORDER
Some places in the kernel don't really expect pageblock_order >=
MAX_ORDER, and it looks like this is only possible in corner cases:
1) CONFIG_DEFERRED_STRUCT_PAGE_INIT we'll end up freeing pageblock_order
pages via __free_pages_core(), which cannot possibly work.
...
How should it still happen?
--
Thanks,
David / dhildenb
