slub: Convert to hotplug state machine
Install the callbacks via the state machine.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: linux-mm@kvack.org
Cc: rt@linutronix.de
Cc: David Rientjes <rientjes@google.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Link: http://lkml.kernel.org/r/20160818125731.27256-5-bigeasy@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
diff --git a/mm/slub.c b/mm/slub.c
index 9adae58..2b3e740 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -194,10 +194,6 @@
#define __OBJECT_POISON 0x80000000UL /* Poison object */
#define __CMPXCHG_DOUBLE 0x40000000UL /* Use cmpxchg_double */
-#ifdef CONFIG_SMP
-static struct notifier_block slab_notifier;
-#endif
-
/*
* Tracking user of a slab.
*/
@@ -2305,6 +2301,25 @@
}
/*
+ * Use the cpu notifier to insure that the cpu slabs are flushed when
+ * necessary.
+ */
+static int slub_cpu_dead(unsigned int cpu)
+{
+ struct kmem_cache *s;
+ unsigned long flags;
+
+ mutex_lock(&slab_mutex);
+ list_for_each_entry(s, &slab_caches, list) {
+ local_irq_save(flags);
+ __flush_cpu_slab(s, cpu);
+ local_irq_restore(flags);
+ }
+ mutex_unlock(&slab_mutex);
+ return 0;
+}
+
+/*
* Check if the objects in a per cpu structure fit numa
* locality expectations.
*/
@@ -4144,9 +4159,8 @@
/* Setup random freelists for each cache */
init_freelist_randomization();
-#ifdef CONFIG_SMP
- register_cpu_notifier(&slab_notifier);
-#endif
+ cpuhp_setup_state_nocalls(CPUHP_SLUB_DEAD, "slub:dead", NULL,
+ slub_cpu_dead);
pr_info("SLUB: HWalign=%d, Order=%d-%d, MinObjects=%d, CPUs=%d, Nodes=%d\n",
cache_line_size(),
@@ -4210,43 +4224,6 @@
return err;
}
-#ifdef CONFIG_SMP
-/*
- * Use the cpu notifier to insure that the cpu slabs are flushed when
- * necessary.
- */
-static int slab_cpuup_callback(struct notifier_block *nfb,
- unsigned long action, void *hcpu)
-{
- long cpu = (long)hcpu;
- struct kmem_cache *s;
- unsigned long flags;
-
- switch (action) {
- case CPU_UP_CANCELED:
- case CPU_UP_CANCELED_FROZEN:
- case CPU_DEAD:
- case CPU_DEAD_FROZEN:
- mutex_lock(&slab_mutex);
- list_for_each_entry(s, &slab_caches, list) {
- local_irq_save(flags);
- __flush_cpu_slab(s, cpu);
- local_irq_restore(flags);
- }
- mutex_unlock(&slab_mutex);
- break;
- default:
- break;
- }
- return NOTIFY_OK;
-}
-
-static struct notifier_block slab_notifier = {
- .notifier_call = slab_cpuup_callback
-};
-
-#endif
-
void *__kmalloc_track_caller(size_t size, gfp_t gfpflags, unsigned long caller)
{
struct kmem_cache *s;