在 2020/7/18 上午5:09, Alexander Duyck 写道:

quoted

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index e028b87ce294..4d7df42b32d6 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c

@@ -6721,7 +6721,6 @@ static void __meminit pgdat_init_internals(struct pglist_data *pgdat)
        init_waitqueue_head(&pgdat->pfmemalloc_wait);

        pgdat_page_ext_init(pgdat);
-       spin_lock_init(&pgdat->lru_lock);
        lruvec_init(&pgdat->__lruvec);
 }

This patch would probably make more sense as part of patch 18 since
you removed all of the users of this field there.

yes, I just want to a bit of sense of ceremony to remove this huge big lock. :)