The patch titled
Subject: mm: slub: make object_map_lock a raw_spinlock_t
has been added to the -mm tree. Its filename is
mm-slub-make-object_map_lock-a-raw_spinlock_t.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-slub-make-object_map_lock-a-raw_spinlock_t.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-slub-make-object_map_lock-a-raw_spinlock_t.patch
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------------------------------------------------------
From: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
Subject: mm: slub: make object_map_lock a raw_spinlock_t
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.
Link: https://lkml.kernel.org/r/20210805152000.12817-31-vbabka@xxxxxxx
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
Signed-off-by: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Christoph Lameter <cl@xxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Jann Horn <jannh@xxxxxxxxxx>
Cc: Jesper Dangaard Brouer <brouer@xxxxxxxxxx>
Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Cc: Mike Galbraith <efault@xxxxxx>
Cc: Pekka Enberg <penberg@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/slub.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
--- a/mm/slub.c~mm-slub-make-object_map_lock-a-raw_spinlock_t
+++ a/mm/slub.c
@@ -438,7 +438,7 @@ static inline bool cmpxchg_double_slab(s
#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)
@@ -483,7 +483,7 @@ static unsigned long *get_map(struct kme
{
VM_BUG_ON(!irqs_disabled());
- spin_lock(&object_map_lock);
+ raw_spin_lock(&object_map_lock);
__fill_map(object_map, s, page);
@@ -493,7 +493,7 @@ static unsigned long *get_map(struct kme
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)
_
Patches currently in -mm which might be from bigeasy@xxxxxxxxxxxxx are
mm-slub-move-flush_cpu_slab-invocations-__free_slab-invocations-out-of-irq-context.patch
mm-slub-make-object_map_lock-a-raw_spinlock_t.patch
