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authorPasha Tatashin <pasha.tatashin@soleen.com>2023-01-17 23:46:17 +0300
committerAndrew Morton <akpm@linux-foundation.org>2023-02-03 09:33:22 +0300
commit7ec7096b8577d3b899c1dae456a414f2d08c7ddb (patch)
tree61fcd4e096bddc8dac5b223b8c5b14f4df7b0184 /mm/page_ext.c
parent64517d6e1291b5e942b00c53674ecf33f918313f (diff)
downloadlinux-7ec7096b8577d3b899c1dae456a414f2d08c7ddb.tar.xz
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 <pasha.tatashin@soleen.com> Acked-by: Mike Rapoport (IBM) <rppt@kernel.org> Acked-by: Vlastimil Babka <vbabka@suse.cz> Cc: Charan Teja Kalla <quic_charante@quicinc.com> Cc: David Hildenbrand <david@redhat.com> Cc: Li Zhe <lizhe.67@bytedance.com> Cc: Michal Hocko <mhocko@suse.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/page_ext.c')
-rw-r--r--mm/page_ext.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/page_ext.c b/mm/page_ext.c
index e2c22ffdbb81..dc1626be458b 100644
--- a/mm/page_ext.c
+++ b/mm/page_ext.c
@@ -92,7 +92,7 @@ unsigned long page_ext_size;
static unsigned long total_usage;
static struct page_ext *lookup_page_ext(const struct page *page);
-bool early_page_ext;
+bool early_page_ext __meminitdata;
static int __init setup_early_page_ext(char *str)
{
early_page_ext = true;