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649 lines
17 KiB
649 lines
17 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef MM_SLAB_H |
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#define MM_SLAB_H |
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/* |
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* Internal slab definitions |
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*/ |
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|
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#ifdef CONFIG_SLOB |
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/* |
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* Common fields provided in kmem_cache by all slab allocators |
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* This struct is either used directly by the allocator (SLOB) |
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* or the allocator must include definitions for all fields |
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* provided in kmem_cache_common in their definition of kmem_cache. |
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* |
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* Once we can do anonymous structs (C11 standard) we could put a |
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* anonymous struct definition in these allocators so that the |
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* separate allocations in the kmem_cache structure of SLAB and |
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* SLUB is no longer needed. |
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*/ |
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struct kmem_cache { |
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unsigned int object_size;/* The original size of the object */ |
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unsigned int size; /* The aligned/padded/added on size */ |
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unsigned int align; /* Alignment as calculated */ |
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slab_flags_t flags; /* Active flags on the slab */ |
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unsigned int useroffset;/* Usercopy region offset */ |
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unsigned int usersize; /* Usercopy region size */ |
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const char *name; /* Slab name for sysfs */ |
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int refcount; /* Use counter */ |
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void (*ctor)(void *); /* Called on object slot creation */ |
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struct list_head list; /* List of all slab caches on the system */ |
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}; |
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#endif /* CONFIG_SLOB */ |
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#ifdef CONFIG_SLAB |
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#include <linux/slab_def.h> |
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#endif |
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#ifdef CONFIG_SLUB |
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#include <linux/slub_def.h> |
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#endif |
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#include <linux/memcontrol.h> |
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#include <linux/fault-inject.h> |
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#include <linux/kasan.h> |
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#include <linux/kmemleak.h> |
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#include <linux/random.h> |
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#include <linux/sched/mm.h> |
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/* |
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* State of the slab allocator. |
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* |
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* This is used to describe the states of the allocator during bootup. |
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* Allocators use this to gradually bootstrap themselves. Most allocators |
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* have the problem that the structures used for managing slab caches are |
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* allocated from slab caches themselves. |
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*/ |
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enum slab_state { |
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DOWN, /* No slab functionality yet */ |
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PARTIAL, /* SLUB: kmem_cache_node available */ |
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PARTIAL_NODE, /* SLAB: kmalloc size for node struct available */ |
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UP, /* Slab caches usable but not all extras yet */ |
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FULL /* Everything is working */ |
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}; |
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extern enum slab_state slab_state; |
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|
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/* The slab cache mutex protects the management structures during changes */ |
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extern struct mutex slab_mutex; |
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|
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/* The list of all slab caches on the system */ |
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extern struct list_head slab_caches; |
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|
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/* The slab cache that manages slab cache information */ |
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extern struct kmem_cache *kmem_cache; |
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|
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/* A table of kmalloc cache names and sizes */ |
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extern const struct kmalloc_info_struct { |
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const char *name[NR_KMALLOC_TYPES]; |
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unsigned int size; |
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} kmalloc_info[]; |
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#ifndef CONFIG_SLOB |
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/* Kmalloc array related functions */ |
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void setup_kmalloc_cache_index_table(void); |
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void create_kmalloc_caches(slab_flags_t); |
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|
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/* Find the kmalloc slab corresponding for a certain size */ |
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struct kmem_cache *kmalloc_slab(size_t, gfp_t); |
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#endif |
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gfp_t kmalloc_fix_flags(gfp_t flags); |
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|
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/* Functions provided by the slab allocators */ |
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int __kmem_cache_create(struct kmem_cache *, slab_flags_t flags); |
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struct kmem_cache *create_kmalloc_cache(const char *name, unsigned int size, |
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slab_flags_t flags, unsigned int useroffset, |
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unsigned int usersize); |
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extern void create_boot_cache(struct kmem_cache *, const char *name, |
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unsigned int size, slab_flags_t flags, |
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unsigned int useroffset, unsigned int usersize); |
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|
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int slab_unmergeable(struct kmem_cache *s); |
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struct kmem_cache *find_mergeable(unsigned size, unsigned align, |
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slab_flags_t flags, const char *name, void (*ctor)(void *)); |
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#ifndef CONFIG_SLOB |
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struct kmem_cache * |
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__kmem_cache_alias(const char *name, unsigned int size, unsigned int align, |
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slab_flags_t flags, void (*ctor)(void *)); |
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slab_flags_t kmem_cache_flags(unsigned int object_size, |
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slab_flags_t flags, const char *name); |
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#else |
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static inline struct kmem_cache * |
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__kmem_cache_alias(const char *name, unsigned int size, unsigned int align, |
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slab_flags_t flags, void (*ctor)(void *)) |
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{ return NULL; } |
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static inline slab_flags_t kmem_cache_flags(unsigned int object_size, |
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slab_flags_t flags, const char *name) |
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{ |
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return flags; |
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} |
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#endif |
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/* Legal flag mask for kmem_cache_create(), for various configurations */ |
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#define SLAB_CORE_FLAGS (SLAB_HWCACHE_ALIGN | SLAB_CACHE_DMA | \ |
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SLAB_CACHE_DMA32 | SLAB_PANIC | \ |
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SLAB_TYPESAFE_BY_RCU | SLAB_DEBUG_OBJECTS ) |
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#if defined(CONFIG_DEBUG_SLAB) |
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#define SLAB_DEBUG_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER) |
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#elif defined(CONFIG_SLUB_DEBUG) |
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#define SLAB_DEBUG_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER | \ |
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SLAB_TRACE | SLAB_CONSISTENCY_CHECKS) |
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#else |
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#define SLAB_DEBUG_FLAGS (0) |
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#endif |
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#if defined(CONFIG_SLAB) |
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#define SLAB_CACHE_FLAGS (SLAB_MEM_SPREAD | SLAB_NOLEAKTRACE | \ |
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SLAB_RECLAIM_ACCOUNT | SLAB_TEMPORARY | \ |
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SLAB_ACCOUNT) |
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#elif defined(CONFIG_SLUB) |
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#define SLAB_CACHE_FLAGS (SLAB_NOLEAKTRACE | SLAB_RECLAIM_ACCOUNT | \ |
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SLAB_TEMPORARY | SLAB_ACCOUNT) |
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#else |
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#define SLAB_CACHE_FLAGS (0) |
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#endif |
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|
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/* Common flags available with current configuration */ |
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#define CACHE_CREATE_MASK (SLAB_CORE_FLAGS | SLAB_DEBUG_FLAGS | SLAB_CACHE_FLAGS) |
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|
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/* Common flags permitted for kmem_cache_create */ |
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#define SLAB_FLAGS_PERMITTED (SLAB_CORE_FLAGS | \ |
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SLAB_RED_ZONE | \ |
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SLAB_POISON | \ |
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SLAB_STORE_USER | \ |
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SLAB_TRACE | \ |
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SLAB_CONSISTENCY_CHECKS | \ |
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SLAB_MEM_SPREAD | \ |
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SLAB_NOLEAKTRACE | \ |
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SLAB_RECLAIM_ACCOUNT | \ |
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SLAB_TEMPORARY | \ |
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SLAB_ACCOUNT) |
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bool __kmem_cache_empty(struct kmem_cache *); |
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int __kmem_cache_shutdown(struct kmem_cache *); |
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void __kmem_cache_release(struct kmem_cache *); |
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int __kmem_cache_shrink(struct kmem_cache *); |
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void slab_kmem_cache_release(struct kmem_cache *); |
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struct seq_file; |
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struct file; |
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struct slabinfo { |
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unsigned long active_objs; |
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unsigned long num_objs; |
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unsigned long active_slabs; |
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unsigned long num_slabs; |
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unsigned long shared_avail; |
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unsigned int limit; |
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unsigned int batchcount; |
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unsigned int shared; |
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unsigned int objects_per_slab; |
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unsigned int cache_order; |
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}; |
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void get_slabinfo(struct kmem_cache *s, struct slabinfo *sinfo); |
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void slabinfo_show_stats(struct seq_file *m, struct kmem_cache *s); |
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ssize_t slabinfo_write(struct file *file, const char __user *buffer, |
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size_t count, loff_t *ppos); |
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/* |
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* Generic implementation of bulk operations |
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* These are useful for situations in which the allocator cannot |
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* perform optimizations. In that case segments of the object listed |
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* may be allocated or freed using these operations. |
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*/ |
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void __kmem_cache_free_bulk(struct kmem_cache *, size_t, void **); |
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int __kmem_cache_alloc_bulk(struct kmem_cache *, gfp_t, size_t, void **); |
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static inline enum node_stat_item cache_vmstat_idx(struct kmem_cache *s) |
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{ |
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return (s->flags & SLAB_RECLAIM_ACCOUNT) ? |
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NR_SLAB_RECLAIMABLE_B : NR_SLAB_UNRECLAIMABLE_B; |
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} |
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#ifdef CONFIG_SLUB_DEBUG |
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#ifdef CONFIG_SLUB_DEBUG_ON |
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DECLARE_STATIC_KEY_TRUE(slub_debug_enabled); |
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#else |
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DECLARE_STATIC_KEY_FALSE(slub_debug_enabled); |
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#endif |
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extern void print_tracking(struct kmem_cache *s, void *object); |
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long validate_slab_cache(struct kmem_cache *s); |
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static inline bool __slub_debug_enabled(void) |
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{ |
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return static_branch_unlikely(&slub_debug_enabled); |
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} |
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#else |
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static inline void print_tracking(struct kmem_cache *s, void *object) |
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{ |
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} |
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static inline bool __slub_debug_enabled(void) |
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{ |
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return false; |
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} |
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#endif |
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/* |
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* Returns true if any of the specified slub_debug flags is enabled for the |
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* cache. Use only for flags parsed by setup_slub_debug() as it also enables |
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* the static key. |
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*/ |
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static inline bool kmem_cache_debug_flags(struct kmem_cache *s, slab_flags_t flags) |
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{ |
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if (IS_ENABLED(CONFIG_SLUB_DEBUG)) |
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VM_WARN_ON_ONCE(!(flags & SLAB_DEBUG_FLAGS)); |
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if (__slub_debug_enabled()) |
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return s->flags & flags; |
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return false; |
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} |
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#ifdef CONFIG_MEMCG_KMEM |
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int memcg_alloc_page_obj_cgroups(struct page *page, struct kmem_cache *s, |
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gfp_t gfp, bool new_page); |
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void mod_objcg_state(struct obj_cgroup *objcg, struct pglist_data *pgdat, |
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enum node_stat_item idx, int nr); |
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static inline void memcg_free_page_obj_cgroups(struct page *page) |
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{ |
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kfree(page_objcgs(page)); |
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page->memcg_data = 0; |
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} |
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static inline size_t obj_full_size(struct kmem_cache *s) |
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{ |
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/* |
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* For each accounted object there is an extra space which is used |
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* to store obj_cgroup membership. Charge it too. |
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*/ |
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return s->size + sizeof(struct obj_cgroup *); |
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} |
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/* |
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* Returns false if the allocation should fail. |
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*/ |
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static inline bool memcg_slab_pre_alloc_hook(struct kmem_cache *s, |
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struct obj_cgroup **objcgp, |
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size_t objects, gfp_t flags) |
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{ |
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struct obj_cgroup *objcg; |
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if (!memcg_kmem_enabled()) |
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return true; |
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if (!(flags & __GFP_ACCOUNT) && !(s->flags & SLAB_ACCOUNT)) |
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return true; |
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objcg = get_obj_cgroup_from_current(); |
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if (!objcg) |
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return true; |
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if (obj_cgroup_charge(objcg, flags, objects * obj_full_size(s))) { |
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obj_cgroup_put(objcg); |
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return false; |
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} |
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*objcgp = objcg; |
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return true; |
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} |
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static inline void memcg_slab_post_alloc_hook(struct kmem_cache *s, |
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struct obj_cgroup *objcg, |
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gfp_t flags, size_t size, |
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void **p) |
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{ |
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struct page *page; |
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unsigned long off; |
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size_t i; |
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if (!memcg_kmem_enabled() || !objcg) |
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return; |
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for (i = 0; i < size; i++) { |
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if (likely(p[i])) { |
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page = virt_to_head_page(p[i]); |
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if (!page_objcgs(page) && |
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memcg_alloc_page_obj_cgroups(page, s, flags, |
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false)) { |
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obj_cgroup_uncharge(objcg, obj_full_size(s)); |
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continue; |
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} |
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off = obj_to_index(s, page, p[i]); |
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obj_cgroup_get(objcg); |
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page_objcgs(page)[off] = objcg; |
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mod_objcg_state(objcg, page_pgdat(page), |
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cache_vmstat_idx(s), obj_full_size(s)); |
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} else { |
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obj_cgroup_uncharge(objcg, obj_full_size(s)); |
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} |
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} |
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obj_cgroup_put(objcg); |
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} |
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static inline void memcg_slab_free_hook(struct kmem_cache *s_orig, |
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void **p, int objects) |
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{ |
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struct kmem_cache *s; |
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struct obj_cgroup **objcgs; |
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struct obj_cgroup *objcg; |
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struct page *page; |
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unsigned int off; |
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int i; |
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if (!memcg_kmem_enabled()) |
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return; |
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for (i = 0; i < objects; i++) { |
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if (unlikely(!p[i])) |
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continue; |
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page = virt_to_head_page(p[i]); |
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objcgs = page_objcgs_check(page); |
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if (!objcgs) |
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continue; |
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if (!s_orig) |
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s = page->slab_cache; |
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else |
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s = s_orig; |
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off = obj_to_index(s, page, p[i]); |
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objcg = objcgs[off]; |
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if (!objcg) |
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continue; |
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objcgs[off] = NULL; |
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obj_cgroup_uncharge(objcg, obj_full_size(s)); |
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mod_objcg_state(objcg, page_pgdat(page), cache_vmstat_idx(s), |
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-obj_full_size(s)); |
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obj_cgroup_put(objcg); |
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} |
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} |
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#else /* CONFIG_MEMCG_KMEM */ |
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static inline struct mem_cgroup *memcg_from_slab_obj(void *ptr) |
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{ |
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return NULL; |
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} |
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static inline int memcg_alloc_page_obj_cgroups(struct page *page, |
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struct kmem_cache *s, gfp_t gfp, |
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bool new_page) |
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{ |
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return 0; |
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} |
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static inline void memcg_free_page_obj_cgroups(struct page *page) |
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{ |
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} |
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static inline bool memcg_slab_pre_alloc_hook(struct kmem_cache *s, |
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struct obj_cgroup **objcgp, |
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size_t objects, gfp_t flags) |
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{ |
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return true; |
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} |
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static inline void memcg_slab_post_alloc_hook(struct kmem_cache *s, |
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struct obj_cgroup *objcg, |
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gfp_t flags, size_t size, |
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void **p) |
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{ |
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} |
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static inline void memcg_slab_free_hook(struct kmem_cache *s, |
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void **p, int objects) |
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{ |
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} |
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#endif /* CONFIG_MEMCG_KMEM */ |
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static inline struct kmem_cache *virt_to_cache(const void *obj) |
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{ |
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struct page *page; |
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page = virt_to_head_page(obj); |
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if (WARN_ONCE(!PageSlab(page), "%s: Object is not a Slab page!\n", |
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__func__)) |
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return NULL; |
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return page->slab_cache; |
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} |
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static __always_inline void account_slab_page(struct page *page, int order, |
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struct kmem_cache *s, |
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gfp_t gfp) |
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{ |
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if (memcg_kmem_enabled() && (s->flags & SLAB_ACCOUNT)) |
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memcg_alloc_page_obj_cgroups(page, s, gfp, true); |
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mod_node_page_state(page_pgdat(page), cache_vmstat_idx(s), |
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PAGE_SIZE << order); |
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} |
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static __always_inline void unaccount_slab_page(struct page *page, int order, |
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struct kmem_cache *s) |
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{ |
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if (memcg_kmem_enabled()) |
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memcg_free_page_obj_cgroups(page); |
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mod_node_page_state(page_pgdat(page), cache_vmstat_idx(s), |
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-(PAGE_SIZE << order)); |
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} |
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static inline struct kmem_cache *cache_from_obj(struct kmem_cache *s, void *x) |
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{ |
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struct kmem_cache *cachep; |
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if (!IS_ENABLED(CONFIG_SLAB_FREELIST_HARDENED) && |
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!kmem_cache_debug_flags(s, SLAB_CONSISTENCY_CHECKS)) |
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return s; |
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cachep = virt_to_cache(x); |
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if (WARN(cachep && cachep != s, |
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"%s: Wrong slab cache. %s but object is from %s\n", |
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__func__, s->name, cachep->name)) |
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print_tracking(cachep, x); |
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return cachep; |
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} |
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static inline size_t slab_ksize(const struct kmem_cache *s) |
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{ |
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#ifndef CONFIG_SLUB |
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return s->object_size; |
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#else /* CONFIG_SLUB */ |
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# ifdef CONFIG_SLUB_DEBUG |
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/* |
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* Debugging requires use of the padding between object |
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* and whatever may come after it. |
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*/ |
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if (s->flags & (SLAB_RED_ZONE | SLAB_POISON)) |
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return s->object_size; |
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# endif |
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if (s->flags & SLAB_KASAN) |
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return s->object_size; |
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/* |
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* If we have the need to store the freelist pointer |
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* back there or track user information then we can |
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* only use the space before that information. |
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*/ |
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if (s->flags & (SLAB_TYPESAFE_BY_RCU | SLAB_STORE_USER)) |
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return s->inuse; |
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/* |
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* Else we can use all the padding etc for the allocation |
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*/ |
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return s->size; |
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#endif |
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} |
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static inline struct kmem_cache *slab_pre_alloc_hook(struct kmem_cache *s, |
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struct obj_cgroup **objcgp, |
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size_t size, gfp_t flags) |
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{ |
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flags &= gfp_allowed_mask; |
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might_alloc(flags); |
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if (should_failslab(s, flags)) |
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return NULL; |
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if (!memcg_slab_pre_alloc_hook(s, objcgp, size, flags)) |
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return NULL; |
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return s; |
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} |
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static inline void slab_post_alloc_hook(struct kmem_cache *s, |
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struct obj_cgroup *objcg, gfp_t flags, |
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size_t size, void **p, bool init) |
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{ |
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size_t i; |
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flags &= gfp_allowed_mask; |
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/* |
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* As memory initialization might be integrated into KASAN, |
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* kasan_slab_alloc and initialization memset must be |
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* kept together to avoid discrepancies in behavior. |
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* |
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* As p[i] might get tagged, memset and kmemleak hook come after KASAN. |
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*/ |
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for (i = 0; i < size; i++) { |
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p[i] = kasan_slab_alloc(s, p[i], flags, init); |
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if (p[i] && init && !kasan_has_integrated_init()) |
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memset(p[i], 0, s->object_size); |
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kmemleak_alloc_recursive(p[i], s->object_size, 1, |
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s->flags, flags); |
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} |
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memcg_slab_post_alloc_hook(s, objcg, flags, size, p); |
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} |
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#ifndef CONFIG_SLOB |
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/* |
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* The slab lists for all objects. |
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*/ |
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struct kmem_cache_node { |
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spinlock_t list_lock; |
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|
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#ifdef CONFIG_SLAB |
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struct list_head slabs_partial; /* partial list first, better asm code */ |
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struct list_head slabs_full; |
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struct list_head slabs_free; |
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unsigned long total_slabs; /* length of all slab lists */ |
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unsigned long free_slabs; /* length of free slab list only */ |
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unsigned long free_objects; |
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unsigned int free_limit; |
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unsigned int colour_next; /* Per-node cache coloring */ |
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struct array_cache *shared; /* shared per node */ |
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struct alien_cache **alien; /* on other nodes */ |
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unsigned long next_reap; /* updated without locking */ |
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int free_touched; /* updated without locking */ |
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#endif |
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#ifdef CONFIG_SLUB |
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unsigned long nr_partial; |
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struct list_head partial; |
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#ifdef CONFIG_SLUB_DEBUG |
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atomic_long_t nr_slabs; |
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atomic_long_t total_objects; |
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struct list_head full; |
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#endif |
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#endif |
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|
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}; |
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static inline struct kmem_cache_node *get_node(struct kmem_cache *s, int node) |
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{ |
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return s->node[node]; |
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} |
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/* |
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* Iterator over all nodes. The body will be executed for each node that has |
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* a kmem_cache_node structure allocated (which is true for all online nodes) |
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*/ |
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#define for_each_kmem_cache_node(__s, __node, __n) \ |
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for (__node = 0; __node < nr_node_ids; __node++) \ |
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if ((__n = get_node(__s, __node))) |
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#endif |
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void *slab_start(struct seq_file *m, loff_t *pos); |
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void *slab_next(struct seq_file *m, void *p, loff_t *pos); |
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void slab_stop(struct seq_file *m, void *p); |
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int memcg_slab_show(struct seq_file *m, void *p); |
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#if defined(CONFIG_SLAB) || defined(CONFIG_SLUB_DEBUG) |
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void dump_unreclaimable_slab(void); |
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#else |
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static inline void dump_unreclaimable_slab(void) |
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{ |
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} |
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#endif |
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void ___cache_free(struct kmem_cache *cache, void *x, unsigned long addr); |
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#ifdef CONFIG_SLAB_FREELIST_RANDOM |
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int cache_random_seq_create(struct kmem_cache *cachep, unsigned int count, |
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gfp_t gfp); |
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void cache_random_seq_destroy(struct kmem_cache *cachep); |
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#else |
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static inline int cache_random_seq_create(struct kmem_cache *cachep, |
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unsigned int count, gfp_t gfp) |
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{ |
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return 0; |
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} |
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static inline void cache_random_seq_destroy(struct kmem_cache *cachep) { } |
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#endif /* CONFIG_SLAB_FREELIST_RANDOM */ |
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|
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static inline bool slab_want_init_on_alloc(gfp_t flags, struct kmem_cache *c) |
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{ |
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if (static_branch_maybe(CONFIG_INIT_ON_ALLOC_DEFAULT_ON, |
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&init_on_alloc)) { |
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if (c->ctor) |
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return false; |
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if (c->flags & (SLAB_TYPESAFE_BY_RCU | SLAB_POISON)) |
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return flags & __GFP_ZERO; |
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return true; |
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} |
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return flags & __GFP_ZERO; |
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} |
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|
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static inline bool slab_want_init_on_free(struct kmem_cache *c) |
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{ |
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if (static_branch_maybe(CONFIG_INIT_ON_FREE_DEFAULT_ON, |
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&init_on_free)) |
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return !(c->ctor || |
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(c->flags & (SLAB_TYPESAFE_BY_RCU | SLAB_POISON))); |
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return false; |
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} |
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|
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#if defined(CONFIG_DEBUG_FS) && defined(CONFIG_SLUB_DEBUG) |
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void debugfs_slab_release(struct kmem_cache *); |
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#else |
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static inline void debugfs_slab_release(struct kmem_cache *s) { } |
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#endif |
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|
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#ifdef CONFIG_PRINTK |
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#define KS_ADDRS_COUNT 16 |
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struct kmem_obj_info { |
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void *kp_ptr; |
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struct page *kp_page; |
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void *kp_objp; |
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unsigned long kp_data_offset; |
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struct kmem_cache *kp_slab_cache; |
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void *kp_ret; |
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void *kp_stack[KS_ADDRS_COUNT]; |
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void *kp_free_stack[KS_ADDRS_COUNT]; |
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}; |
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void kmem_obj_info(struct kmem_obj_info *kpp, void *object, struct page *page); |
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#endif |
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|
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#endif /* MM_SLAB_H */
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