[PATCH] mm/slub: try to fix hangs without cmpxchg64/128

[Vlastimil Babka]

If we don't have cmpxchg64/128 and resort to slab_lock()/slab_unlock()
which uses PG_locked, we can get RMW with the newly introduced
slab_set/clear_node_partial() operation that modify PG_workingset so all
the operations have to be atomic now.

Signed-off-by: Vlastimil Babka <vbabka@xxxxxxx>
---
 mm/slub.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/mm/slub.c b/mm/slub.c
index bcb5b2c4e213..f2cdb81ab02e 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -522,7 +522,7 @@ static __always_inline void slab_unlock(struct slab *slab)
 	struct page *page = slab_page(slab);
 
 	VM_BUG_ON_PAGE(PageTail(page), page);
-	__bit_spin_unlock(PG_locked, &page->flags);
+	bit_spin_unlock(PG_locked, &page->flags);
 }
 
 static inline bool
@@ -2127,12 +2127,12 @@ static inline bool slab_test_node_partial(const struct slab *slab)
 
 static inline void slab_set_node_partial(struct slab *slab)
 {
-	__set_bit(PG_workingset, folio_flags(slab_folio(slab), 0));
+	set_bit(PG_workingset, folio_flags(slab_folio(slab), 0));
 }
 
 static inline void slab_clear_node_partial(struct slab *slab)
 {
-	__clear_bit(PG_workingset, folio_flags(slab_folio(slab), 0));
+	clear_bit(PG_workingset, folio_flags(slab_folio(slab), 0));
 }
 
 /*
-- 
2.42.1