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slab fix for 6.15-rc5 

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Merge tag 'slab-for-6.15-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/vbabka/slab

Pull slab fix from Vlastimil Babka:

 - Stable fix to avoid bugs due to leftover obj_ext after allocation
   profiling is disabled at runtime (Zhenhua Huang)

* tag 'slab-for-6.15-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/vbabka/slab:
  mm, slab: clean up slab->obj_exts always
This commit is contained in:
Linus Torvalds 2025-05-02 08:50:10 -07:00
parent ebd297a2af be8250786c
commit 9910affec3
1 changed files with 8 additions and 22 deletions
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30
mm/slub.c
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@ -2028,8 +2028,7 @@ int alloc_slab_obj_exts(struct slab *slab, struct kmem_cache *s,
return 0;
}
/* Should be called only if mem_alloc_profiling_enabled() */
static noinline void free_slab_obj_exts(struct slab *slab)
static inline void free_slab_obj_exts(struct slab *slab)
{
struct slabobj_ext *obj_exts;
@ -2049,18 +2048,6 @@ static noinline void free_slab_obj_exts(struct slab *slab)
slab->obj_exts = 0;
}
static inline bool need_slab_obj_ext(void)
{
if (mem_alloc_profiling_enabled())
return true;
/*
* CONFIG_MEMCG creates vector of obj_cgroup objects conditionally
* inside memcg_slab_post_alloc_hook. No other users for now.
*/
return false;
}
#else /* CONFIG_SLAB_OBJ_EXT */
static inline void init_slab_obj_exts(struct slab *slab)
@ -2077,11 +2064,6 @@ static inline void free_slab_obj_exts(struct slab *slab)
{
}
static inline bool need_slab_obj_ext(void)
{
return false;
}
#endif /* CONFIG_SLAB_OBJ_EXT */
#ifdef CONFIG_MEM_ALLOC_PROFILING
@ -2129,7 +2111,7 @@ __alloc_tagging_slab_alloc_hook(struct kmem_cache *s, void *object, gfp_t flags)
static inline void
alloc_tagging_slab_alloc_hook(struct kmem_cache *s, void *object, gfp_t flags)
{
if (need_slab_obj_ext())
if (mem_alloc_profiling_enabled())
__alloc_tagging_slab_alloc_hook(s, object, flags);
}
@ -2601,8 +2583,12 @@ static __always_inline void account_slab(struct slab *slab, int order,
static __always_inline void unaccount_slab(struct slab *slab, int order,
struct kmem_cache *s)
{
if (memcg_kmem_online() || need_slab_obj_ext())
free_slab_obj_exts(slab);
/*
* The slab object extensions should now be freed regardless of
* whether mem_alloc_profiling_enabled() or not because profiling
* might have been disabled after slab->obj_exts got allocated.
*/
free_slab_obj_exts(slab);
mod_node_page_state(slab_pgdat(slab), cache_vmstat_idx(s),
-(PAGE_SIZE << order));