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mm: slub: make object_map_lock a raw_spinlock_t

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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 <vbabka@suse.cz>
This commit is contained in:
Sebastian Andrzej Siewior 2020-07-16 18:47:50 +02:00 committed by Vlastimil Babka
parent 5a836bf6b0
commit 94ef0304e2
1 changed files with 3 additions and 3 deletions
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6
mm/slub.c
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@ -452,7 +452,7 @@ static inline bool cmpxchg_double_slab(struct kmem_cache *s, struct page *page,
#ifdef CONFIG_SLUB_DEBUG #ifdef CONFIG_SLUB_DEBUG
static unsigned long object_map[BITS_TO_LONGS(MAX_OBJS_PER_PAGE)]; 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, static void __fill_map(unsigned long *obj_map, struct kmem_cache *s,
struct page *page) struct page *page)
@ -497,7 +497,7 @@ static unsigned long *get_map(struct kmem_cache *s, struct page *page)
{ {
VM_BUG_ON(!irqs_disabled()); VM_BUG_ON(!irqs_disabled());
spin_lock(&object_map_lock); raw_spin_lock(&object_map_lock);
__fill_map(object_map, s, page); __fill_map(object_map, s, page);
@ -507,7 +507,7 @@ static unsigned long *get_map(struct kmem_cache *s, struct page *page)
static void put_map(unsigned long *map) __releases(&object_map_lock) static void put_map(unsigned long *map) __releases(&object_map_lock)
{ {
VM_BUG_ON(map != object_map); 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) static inline unsigned int size_from_object(struct kmem_cache *s)