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| author | Pasha Tatashin <pasha.tatashin@soleen.com> | 2023-01-17 20:46:17 +0000 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-02-02 22:33:22 -0800 |
| commit | 7ec7096b8577d3b899c1dae456a414f2d08c7ddb (patch) | |
| tree | 61fcd4e096bddc8dac5b223b8c5b14f4df7b0184 /mm/page_ext.c | |
| parent | 64517d6e1291b5e942b00c53674ecf33f918313f (diff) | |
| download | lwn-7ec7096b8577d3b899c1dae456a414f2d08c7ddb.tar.gz lwn-7ec7096b8577d3b899c1dae456a414f2d08c7ddb.zip | |
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.c | 2 |
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; |