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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Thu, 16 Jul 2020 18:47:50 +0200
Subject: [PATCH] mm/slub: Make object_map_lock a raw_spinlock_t
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.10/older/patches-5.10.21-rt34.tar.xz
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>
---
mm/slub.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -434,7 +434,7 @@ 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);
/*
* Determine a map of object in use on a page.
@@ -450,7 +450,7 @@ static unsigned long *get_map(struct kme
VM_BUG_ON(!irqs_disabled());
- spin_lock(&object_map_lock);
+ raw_spin_lock(&object_map_lock);
bitmap_zero(object_map, page->objects);
@@ -463,7 +463,7 @@ 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)
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