bpf: arena: allow calling from any context. #9997
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vm_area_map_pages() may allocate memory while inserting pages into bpf arena's vm_area. In order to make bpf_arena_alloc_pages() kfunc non-sleepable change bpf arena to populate pages without allocating memory: - at arena creation time populate all page table levels except the last level - when new pages need to be inserted call apply_to_page_range() again which will only set_pte_at() those pages and will not allocate memory - when freeing pages, the work is deferred and apply_to_existing_page_range() is used to reset the pte entry and free the page. This way the intermediate page table levels are not freed until the arena is destroyed. Co-developed-by: Alexei Starovoitov <[email protected]> Signed-off-by: Puranjay Mohan <[email protected]>
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vm_area_map_pages() may allocate memory while inserting pages into bpf arena's vm_area. In order to make bpf_arena_alloc_pages() kfunc non-sleepable change bpf arena to populate pages without allocating memory:
Co-developed-by: Alexei Starovoitov [email protected]