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Merge tag 'slab-for-6.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vbabka/slab

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Pull slab fixes from Vlastimil Babka:

 - Fixes for several corner cases in error paths and debugging options,
   related to the new kmalloc_nolock() functionality (Kuniyuki Iwashima,
   Ran Xiaokai)

* tag 'slab-for-6.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vbabka/slab:
  slub: Don't call lockdep_unregister_key() for immature kmem_cache.
  slab: Fix using this_cpu_ptr() in preemptible context
  slab: Add allow_spin check to eliminate kmemleak warnings
This commit is contained in:
Linus Torvalds
2025-10-09 10:33:50 -07:00
parent ec714e371f f7dfa0f31b
commit f6db358dea
1 changed files with 13 additions and 4 deletions
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17
mm/slub.c
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@@ -2152,7 +2152,8 @@ int alloc_slab_obj_exts(struct slab *slab, struct kmem_cache *s,
return 0;
}
kmemleak_not_leak(vec);
if (allow_spin)
kmemleak_not_leak(vec);
return 0;
}
@@ -6431,17 +6432,24 @@ static void free_deferred_objects(struct irq_work *work)
static void defer_free(struct kmem_cache *s, void *head)
{
struct defer_free *df = this_cpu_ptr(&defer_free_objects);
struct defer_free *df;
guard(preempt)();
df = this_cpu_ptr(&defer_free_objects);
if (llist_add(head + s->offset, &df->objects))
irq_work_queue(&df->work);
}
static void defer_deactivate_slab(struct slab *slab, void *flush_freelist)
{
struct defer_free *df = this_cpu_ptr(&defer_free_objects);
struct defer_free *df;
slab->flush_freelist = flush_freelist;
guard(preempt)();
df = this_cpu_ptr(&defer_free_objects);
if (llist_add(&slab->llnode, &df->slabs))
irq_work_queue(&df->work);
}
@@ -7693,7 +7701,8 @@ void __kmem_cache_release(struct kmem_cache *s)
pcs_destroy(s);
#ifndef CONFIG_SLUB_TINY
#ifdef CONFIG_PREEMPT_RT
lockdep_unregister_key(&s->lock_key);
if (s->cpu_slab)
lockdep_unregister_key(&s->lock_key);
#endif
free_percpu(s->cpu_slab);
#endif