From 7ec7096b8577d3b899c1dae456a414f2d08c7ddb Mon Sep 17 00:00:00 2001 From: Pasha Tatashin Date: Tue, 17 Jan 2023 20:46:17 +0000 Subject: mm/page_ext: init page_ext early if there are no deferred struct pages page_ext must be initialized after all struct pages are initialized. Therefore, page_ext is initialized after page_alloc_init_late(), and can optionally be initialized earlier via early_page_ext kernel parameter which as a side effect also disables deferred struct pages. Allow to automatically init page_ext early when there are no deferred struct pages in order to be able to use page_ext during kernel boot and track for example page allocations early. [pasha.tatashin@soleen.com: fix build with CONFIG_PAGE_EXTENSION=n] Link: https://lkml.kernel.org/r/20230118155251.2522985-1-pasha.tatashin@soleen.com Link: https://lkml.kernel.org/r/20230117204617.1553748-1-pasha.tatashin@soleen.com Signed-off-by: Pasha Tatashin Acked-by: Mike Rapoport (IBM) Acked-by: Vlastimil Babka Cc: Charan Teja Kalla Cc: David Hildenbrand Cc: Li Zhe Cc: Michal Hocko Signed-off-by: Andrew Morton --- include/linux/page_ext.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'include/linux') diff --git a/include/linux/page_ext.h b/include/linux/page_ext.h index 67314f648aeb..bc2e39090a1f 100644 --- a/include/linux/page_ext.h +++ b/include/linux/page_ext.h @@ -29,6 +29,8 @@ struct page_ext_operations { bool need_shared_flags; }; +extern bool deferred_struct_pages; + #ifdef CONFIG_PAGE_EXTENSION /* -- cgit v1.2.3