[RFC v2 30/34] mm: slub: Make object_map_lock a raw_spinlock_t
From: Vlastimil Babka <hidden>
Date: 2021-06-09 11:41:16
Also in:
lkml
Subsystem:
memory management, slab allocator, the rest · Maintainers:
Andrew Morton, Vlastimil Babka, Harry Yoo, Linus Torvalds
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de> The variable object_map is protected by object_map_lock. The lock is always acquired in debug code and within already atomic context Make object_map_lock a raw_spinlock_t. Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Vlastimil Babka <redacted> --- mm/slub.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/mm/slub.c b/mm/slub.c
index 6e747e0d7dcd..cfd5a7660375 100644
--- a/mm/slub.c
+++ b/mm/slub.c@@ -432,7 +432,7 @@ static inline bool cmpxchg_double_slab(struct kmem_cache *s, struct page *page, #ifdef CONFIG_SLUB_DEBUG static unsigned long object_map[BITS_TO_LONGS(MAX_OBJS_PER_PAGE)]; -static DEFINE_SPINLOCK(object_map_lock); +static DEFINE_RAW_SPINLOCK(object_map_lock); static void __fill_map(unsigned long *obj_map, struct kmem_cache *s, struct page *page)
@@ -457,7 +457,7 @@ static unsigned long *get_map(struct kmem_cache *s, struct page *page) { VM_BUG_ON(!irqs_disabled()); - spin_lock(&object_map_lock); + raw_spin_lock(&object_map_lock); __fill_map(object_map, s, page);
@@ -467,7 +467,7 @@ static unsigned long *get_map(struct kmem_cache *s, struct page *page) static void put_map(unsigned long *map) __releases(&object_map_lock) { VM_BUG_ON(map != object_map); - spin_unlock(&object_map_lock); + raw_spin_unlock(&object_map_lock); } static inline unsigned int size_from_object(struct kmem_cache *s)
--
2.31.1