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e7efa615cc
At the moment, kmalloc() isn't even listed in the kernel API documentation (DocBook/kernel-api.html after running "make htmldocs"). Another issue is that the documentation for kmalloc_node() refers to kcalloc()'s documentation to describe its 'flags' parameter, while kcalloc() refered to kmalloc()'s documentation, which doesn't exist! This patch is a proposed fix for this. It also removes the documentation for kmalloc() in include/linux/slob_def.h which isn't included to generate the documentation anyway. This way, kmalloc() is described in only one place. Acked-by: Christoph Lameter <cl@linux.com> Acked-by: Randy Dunlap <rdunlap@infradead.org> Signed-off-by: Michael Opdenacker <michael.opdenacker@free-electrons.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
570 lines
17 KiB
C
570 lines
17 KiB
C
/*
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* Written by Mark Hemment, 1996 (markhe@nextd.demon.co.uk).
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*
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* (C) SGI 2006, Christoph Lameter
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* Cleaned up and restructured to ease the addition of alternative
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* implementations of SLAB allocators.
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*/
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#ifndef _LINUX_SLAB_H
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#define _LINUX_SLAB_H
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#include <linux/gfp.h>
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#include <linux/types.h>
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#include <linux/workqueue.h>
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/*
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* Flags to pass to kmem_cache_create().
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* The ones marked DEBUG are only valid if CONFIG_SLAB_DEBUG is set.
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*/
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#define SLAB_DEBUG_FREE 0x00000100UL /* DEBUG: Perform (expensive) checks on free */
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#define SLAB_RED_ZONE 0x00000400UL /* DEBUG: Red zone objs in a cache */
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#define SLAB_POISON 0x00000800UL /* DEBUG: Poison objects */
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#define SLAB_HWCACHE_ALIGN 0x00002000UL /* Align objs on cache lines */
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#define SLAB_CACHE_DMA 0x00004000UL /* Use GFP_DMA memory */
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#define SLAB_STORE_USER 0x00010000UL /* DEBUG: Store the last owner for bug hunting */
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#define SLAB_PANIC 0x00040000UL /* Panic if kmem_cache_create() fails */
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/*
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* SLAB_DESTROY_BY_RCU - **WARNING** READ THIS!
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*
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* This delays freeing the SLAB page by a grace period, it does _NOT_
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* delay object freeing. This means that if you do kmem_cache_free()
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* that memory location is free to be reused at any time. Thus it may
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* be possible to see another object there in the same RCU grace period.
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*
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* This feature only ensures the memory location backing the object
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* stays valid, the trick to using this is relying on an independent
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* object validation pass. Something like:
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*
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* rcu_read_lock()
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* again:
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* obj = lockless_lookup(key);
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* if (obj) {
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* if (!try_get_ref(obj)) // might fail for free objects
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* goto again;
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*
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* if (obj->key != key) { // not the object we expected
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* put_ref(obj);
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* goto again;
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* }
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* }
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* rcu_read_unlock();
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*
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* See also the comment on struct slab_rcu in mm/slab.c.
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*/
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#define SLAB_DESTROY_BY_RCU 0x00080000UL /* Defer freeing slabs to RCU */
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#define SLAB_MEM_SPREAD 0x00100000UL /* Spread some memory over cpuset */
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#define SLAB_TRACE 0x00200000UL /* Trace allocations and frees */
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/* Flag to prevent checks on free */
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#ifdef CONFIG_DEBUG_OBJECTS
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# define SLAB_DEBUG_OBJECTS 0x00400000UL
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#else
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# define SLAB_DEBUG_OBJECTS 0x00000000UL
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#endif
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#define SLAB_NOLEAKTRACE 0x00800000UL /* Avoid kmemleak tracing */
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/* Don't track use of uninitialized memory */
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#ifdef CONFIG_KMEMCHECK
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# define SLAB_NOTRACK 0x01000000UL
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#else
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# define SLAB_NOTRACK 0x00000000UL
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#endif
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#ifdef CONFIG_FAILSLAB
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# define SLAB_FAILSLAB 0x02000000UL /* Fault injection mark */
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#else
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# define SLAB_FAILSLAB 0x00000000UL
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#endif
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/* The following flags affect the page allocator grouping pages by mobility */
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#define SLAB_RECLAIM_ACCOUNT 0x00020000UL /* Objects are reclaimable */
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#define SLAB_TEMPORARY SLAB_RECLAIM_ACCOUNT /* Objects are short-lived */
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/*
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* ZERO_SIZE_PTR will be returned for zero sized kmalloc requests.
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*
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* Dereferencing ZERO_SIZE_PTR will lead to a distinct access fault.
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*
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* ZERO_SIZE_PTR can be passed to kfree though in the same way that NULL can.
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* Both make kfree a no-op.
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*/
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#define ZERO_SIZE_PTR ((void *)16)
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#define ZERO_OR_NULL_PTR(x) ((unsigned long)(x) <= \
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(unsigned long)ZERO_SIZE_PTR)
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struct mem_cgroup;
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/*
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* struct kmem_cache related prototypes
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*/
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void __init kmem_cache_init(void);
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int slab_is_available(void);
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struct kmem_cache *kmem_cache_create(const char *, size_t, size_t,
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unsigned long,
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void (*)(void *));
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struct kmem_cache *
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kmem_cache_create_memcg(struct mem_cgroup *, const char *, size_t, size_t,
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unsigned long, void (*)(void *), struct kmem_cache *);
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void kmem_cache_destroy(struct kmem_cache *);
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int kmem_cache_shrink(struct kmem_cache *);
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void kmem_cache_free(struct kmem_cache *, void *);
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/*
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* Please use this macro to create slab caches. Simply specify the
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* name of the structure and maybe some flags that are listed above.
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*
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* The alignment of the struct determines object alignment. If you
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* f.e. add ____cacheline_aligned_in_smp to the struct declaration
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* then the objects will be properly aligned in SMP configurations.
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*/
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#define KMEM_CACHE(__struct, __flags) kmem_cache_create(#__struct,\
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sizeof(struct __struct), __alignof__(struct __struct),\
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(__flags), NULL)
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/*
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* Common kmalloc functions provided by all allocators
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*/
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void * __must_check __krealloc(const void *, size_t, gfp_t);
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void * __must_check krealloc(const void *, size_t, gfp_t);
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void kfree(const void *);
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void kzfree(const void *);
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size_t ksize(const void *);
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/*
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* Some archs want to perform DMA into kmalloc caches and need a guaranteed
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* alignment larger than the alignment of a 64-bit integer.
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* Setting ARCH_KMALLOC_MINALIGN in arch headers allows that.
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*/
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#if defined(ARCH_DMA_MINALIGN) && ARCH_DMA_MINALIGN > 8
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#define ARCH_KMALLOC_MINALIGN ARCH_DMA_MINALIGN
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#define KMALLOC_MIN_SIZE ARCH_DMA_MINALIGN
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#define KMALLOC_SHIFT_LOW ilog2(ARCH_DMA_MINALIGN)
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#else
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#define ARCH_KMALLOC_MINALIGN __alignof__(unsigned long long)
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#endif
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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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unsigned long flags; /* Active flags on the slab */
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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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/*
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* Kmalloc array related definitions
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*/
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#ifdef CONFIG_SLAB
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/*
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* The largest kmalloc size supported by the SLAB allocators is
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* 32 megabyte (2^25) or the maximum allocatable page order if that is
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* less than 32 MB.
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*
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* WARNING: Its not easy to increase this value since the allocators have
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* to do various tricks to work around compiler limitations in order to
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* ensure proper constant folding.
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*/
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#define KMALLOC_SHIFT_HIGH ((MAX_ORDER + PAGE_SHIFT - 1) <= 25 ? \
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(MAX_ORDER + PAGE_SHIFT - 1) : 25)
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#define KMALLOC_SHIFT_MAX KMALLOC_SHIFT_HIGH
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#ifndef KMALLOC_SHIFT_LOW
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#define KMALLOC_SHIFT_LOW 5
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#endif
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#endif
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#ifdef CONFIG_SLUB
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/*
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* SLUB allocates up to order 2 pages directly and otherwise
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* passes the request to the page allocator.
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*/
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#define KMALLOC_SHIFT_HIGH (PAGE_SHIFT + 1)
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#define KMALLOC_SHIFT_MAX (MAX_ORDER + PAGE_SHIFT)
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#ifndef KMALLOC_SHIFT_LOW
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#define KMALLOC_SHIFT_LOW 3
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#endif
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#endif
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#ifdef CONFIG_SLOB
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/*
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* SLOB passes all page size and larger requests to the page allocator.
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* No kmalloc array is necessary since objects of different sizes can
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* be allocated from the same page.
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*/
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#define KMALLOC_SHIFT_MAX 30
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#define KMALLOC_SHIFT_HIGH PAGE_SHIFT
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#ifndef KMALLOC_SHIFT_LOW
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#define KMALLOC_SHIFT_LOW 3
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#endif
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#endif
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/* Maximum allocatable size */
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#define KMALLOC_MAX_SIZE (1UL << KMALLOC_SHIFT_MAX)
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/* Maximum size for which we actually use a slab cache */
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#define KMALLOC_MAX_CACHE_SIZE (1UL << KMALLOC_SHIFT_HIGH)
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/* Maximum order allocatable via the slab allocagtor */
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#define KMALLOC_MAX_ORDER (KMALLOC_SHIFT_MAX - PAGE_SHIFT)
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/*
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* Kmalloc subsystem.
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*/
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#ifndef KMALLOC_MIN_SIZE
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#define KMALLOC_MIN_SIZE (1 << KMALLOC_SHIFT_LOW)
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#endif
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#ifndef CONFIG_SLOB
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extern struct kmem_cache *kmalloc_caches[KMALLOC_SHIFT_HIGH + 1];
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#ifdef CONFIG_ZONE_DMA
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extern struct kmem_cache *kmalloc_dma_caches[KMALLOC_SHIFT_HIGH + 1];
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#endif
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/*
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* Figure out which kmalloc slab an allocation of a certain size
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* belongs to.
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* 0 = zero alloc
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* 1 = 65 .. 96 bytes
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* 2 = 120 .. 192 bytes
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* n = 2^(n-1) .. 2^n -1
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*/
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static __always_inline int kmalloc_index(size_t size)
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{
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if (!size)
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return 0;
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if (size <= KMALLOC_MIN_SIZE)
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return KMALLOC_SHIFT_LOW;
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if (KMALLOC_MIN_SIZE <= 32 && size > 64 && size <= 96)
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return 1;
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if (KMALLOC_MIN_SIZE <= 64 && size > 128 && size <= 192)
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return 2;
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if (size <= 8) return 3;
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if (size <= 16) return 4;
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if (size <= 32) return 5;
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if (size <= 64) return 6;
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if (size <= 128) return 7;
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if (size <= 256) return 8;
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if (size <= 512) return 9;
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if (size <= 1024) return 10;
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if (size <= 2 * 1024) return 11;
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if (size <= 4 * 1024) return 12;
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if (size <= 8 * 1024) return 13;
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if (size <= 16 * 1024) return 14;
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if (size <= 32 * 1024) return 15;
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if (size <= 64 * 1024) return 16;
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if (size <= 128 * 1024) return 17;
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if (size <= 256 * 1024) return 18;
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if (size <= 512 * 1024) return 19;
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if (size <= 1024 * 1024) return 20;
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if (size <= 2 * 1024 * 1024) return 21;
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if (size <= 4 * 1024 * 1024) return 22;
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if (size <= 8 * 1024 * 1024) return 23;
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if (size <= 16 * 1024 * 1024) return 24;
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if (size <= 32 * 1024 * 1024) return 25;
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if (size <= 64 * 1024 * 1024) return 26;
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BUG();
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/* Will never be reached. Needed because the compiler may complain */
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return -1;
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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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#ifdef CONFIG_SLOB
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#include <linux/slob_def.h>
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#endif
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/*
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* Determine size used for the nth kmalloc cache.
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* return size or 0 if a kmalloc cache for that
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* size does not exist
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*/
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static __always_inline int kmalloc_size(int n)
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{
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#ifndef CONFIG_SLOB
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if (n > 2)
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return 1 << n;
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if (n == 1 && KMALLOC_MIN_SIZE <= 32)
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return 96;
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if (n == 2 && KMALLOC_MIN_SIZE <= 64)
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return 192;
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#endif
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return 0;
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}
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/*
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* Setting ARCH_SLAB_MINALIGN in arch headers allows a different alignment.
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* Intended for arches that get misalignment faults even for 64 bit integer
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* aligned buffers.
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*/
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#ifndef ARCH_SLAB_MINALIGN
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#define ARCH_SLAB_MINALIGN __alignof__(unsigned long long)
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#endif
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/*
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* This is the main placeholder for memcg-related information in kmem caches.
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* struct kmem_cache will hold a pointer to it, so the memory cost while
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* disabled is 1 pointer. The runtime cost while enabled, gets bigger than it
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* would otherwise be if that would be bundled in kmem_cache: we'll need an
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* extra pointer chase. But the trade off clearly lays in favor of not
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* penalizing non-users.
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*
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* Both the root cache and the child caches will have it. For the root cache,
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* this will hold a dynamically allocated array large enough to hold
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* information about the currently limited memcgs in the system.
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*
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* Child caches will hold extra metadata needed for its operation. Fields are:
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*
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* @memcg: pointer to the memcg this cache belongs to
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* @list: list_head for the list of all caches in this memcg
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* @root_cache: pointer to the global, root cache, this cache was derived from
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* @dead: set to true after the memcg dies; the cache may still be around.
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* @nr_pages: number of pages that belongs to this cache.
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* @destroy: worker to be called whenever we are ready, or believe we may be
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* ready, to destroy this cache.
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*/
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struct memcg_cache_params {
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bool is_root_cache;
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union {
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struct kmem_cache *memcg_caches[0];
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struct {
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struct mem_cgroup *memcg;
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struct list_head list;
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struct kmem_cache *root_cache;
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bool dead;
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atomic_t nr_pages;
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struct work_struct destroy;
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};
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};
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};
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int memcg_update_all_caches(int num_memcgs);
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struct seq_file;
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int cache_show(struct kmem_cache *s, struct seq_file *m);
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void print_slabinfo_header(struct seq_file *m);
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/**
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* kmalloc - allocate memory
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* @size: how many bytes of memory are required.
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* @flags: the type of memory to allocate.
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*
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* The @flags argument may be one of:
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*
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* %GFP_USER - Allocate memory on behalf of user. May sleep.
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*
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* %GFP_KERNEL - Allocate normal kernel ram. May sleep.
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*
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* %GFP_ATOMIC - Allocation will not sleep. May use emergency pools.
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* For example, use this inside interrupt handlers.
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*
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* %GFP_HIGHUSER - Allocate pages from high memory.
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*
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* %GFP_NOIO - Do not do any I/O at all while trying to get memory.
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*
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* %GFP_NOFS - Do not make any fs calls while trying to get memory.
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*
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* %GFP_NOWAIT - Allocation will not sleep.
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*
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* %GFP_THISNODE - Allocate node-local memory only.
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*
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* %GFP_DMA - Allocation suitable for DMA.
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* Should only be used for kmalloc() caches. Otherwise, use a
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* slab created with SLAB_DMA.
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*
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* Also it is possible to set different flags by OR'ing
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* in one or more of the following additional @flags:
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*
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* %__GFP_COLD - Request cache-cold pages instead of
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* trying to return cache-warm pages.
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*
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* %__GFP_HIGH - This allocation has high priority and may use emergency pools.
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*
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* %__GFP_NOFAIL - Indicate that this allocation is in no way allowed to fail
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* (think twice before using).
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*
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* %__GFP_NORETRY - If memory is not immediately available,
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* then give up at once.
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*
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* %__GFP_NOWARN - If allocation fails, don't issue any warnings.
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*
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* %__GFP_REPEAT - If allocation fails initially, try once more before failing.
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*
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* There are other flags available as well, but these are not intended
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* for general use, and so are not documented here. For a full list of
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* potential flags, always refer to linux/gfp.h.
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*
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* kmalloc is the normal method of allocating memory
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* in the kernel.
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*/
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static __always_inline void *kmalloc(size_t size, gfp_t flags);
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/**
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* kmalloc_array - allocate memory for an array.
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* @n: number of elements.
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* @size: element size.
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* @flags: the type of memory to allocate (see kmalloc).
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*/
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static inline void *kmalloc_array(size_t n, size_t size, gfp_t flags)
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{
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if (size != 0 && n > SIZE_MAX / size)
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return NULL;
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return __kmalloc(n * size, flags);
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}
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/**
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* kcalloc - allocate memory for an array. The memory is set to zero.
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* @n: number of elements.
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* @size: element size.
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* @flags: the type of memory to allocate (see kmalloc).
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*/
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static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
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{
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return kmalloc_array(n, size, flags | __GFP_ZERO);
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}
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#if !defined(CONFIG_NUMA) && !defined(CONFIG_SLOB)
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/**
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* kmalloc_node - allocate memory from a specific node
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* @size: how many bytes of memory are required.
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* @flags: the type of memory to allocate (see kmalloc).
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* @node: node to allocate from.
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*
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* kmalloc() for non-local nodes, used to allocate from a specific node
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* if available. Equivalent to kmalloc() in the non-NUMA single-node
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* case.
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*/
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static inline void *kmalloc_node(size_t size, gfp_t flags, int node)
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{
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return kmalloc(size, flags);
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}
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static inline void *__kmalloc_node(size_t size, gfp_t flags, int node)
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{
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return __kmalloc(size, flags);
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}
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void *kmem_cache_alloc(struct kmem_cache *, gfp_t);
|
|
|
|
static inline void *kmem_cache_alloc_node(struct kmem_cache *cachep,
|
|
gfp_t flags, int node)
|
|
{
|
|
return kmem_cache_alloc(cachep, flags);
|
|
}
|
|
#endif /* !CONFIG_NUMA && !CONFIG_SLOB */
|
|
|
|
/*
|
|
* kmalloc_track_caller is a special version of kmalloc that records the
|
|
* calling function of the routine calling it for slab leak tracking instead
|
|
* of just the calling function (confusing, eh?).
|
|
* It's useful when the call to kmalloc comes from a widely-used standard
|
|
* allocator where we care about the real place the memory allocation
|
|
* request comes from.
|
|
*/
|
|
#if defined(CONFIG_DEBUG_SLAB) || defined(CONFIG_SLUB) || \
|
|
(defined(CONFIG_SLAB) && defined(CONFIG_TRACING)) || \
|
|
(defined(CONFIG_SLOB) && defined(CONFIG_TRACING))
|
|
extern void *__kmalloc_track_caller(size_t, gfp_t, unsigned long);
|
|
#define kmalloc_track_caller(size, flags) \
|
|
__kmalloc_track_caller(size, flags, _RET_IP_)
|
|
#else
|
|
#define kmalloc_track_caller(size, flags) \
|
|
__kmalloc(size, flags)
|
|
#endif /* DEBUG_SLAB */
|
|
|
|
#ifdef CONFIG_NUMA
|
|
/*
|
|
* kmalloc_node_track_caller is a special version of kmalloc_node that
|
|
* records the calling function of the routine calling it for slab leak
|
|
* tracking instead of just the calling function (confusing, eh?).
|
|
* It's useful when the call to kmalloc_node comes from a widely-used
|
|
* standard allocator where we care about the real place the memory
|
|
* allocation request comes from.
|
|
*/
|
|
#if defined(CONFIG_DEBUG_SLAB) || defined(CONFIG_SLUB) || \
|
|
(defined(CONFIG_SLAB) && defined(CONFIG_TRACING)) || \
|
|
(defined(CONFIG_SLOB) && defined(CONFIG_TRACING))
|
|
extern void *__kmalloc_node_track_caller(size_t, gfp_t, int, unsigned long);
|
|
#define kmalloc_node_track_caller(size, flags, node) \
|
|
__kmalloc_node_track_caller(size, flags, node, \
|
|
_RET_IP_)
|
|
#else
|
|
#define kmalloc_node_track_caller(size, flags, node) \
|
|
__kmalloc_node(size, flags, node)
|
|
#endif
|
|
|
|
#else /* CONFIG_NUMA */
|
|
|
|
#define kmalloc_node_track_caller(size, flags, node) \
|
|
kmalloc_track_caller(size, flags)
|
|
|
|
#endif /* CONFIG_NUMA */
|
|
|
|
/*
|
|
* Shortcuts
|
|
*/
|
|
static inline void *kmem_cache_zalloc(struct kmem_cache *k, gfp_t flags)
|
|
{
|
|
return kmem_cache_alloc(k, flags | __GFP_ZERO);
|
|
}
|
|
|
|
/**
|
|
* kzalloc - allocate memory. The memory is set to zero.
|
|
* @size: how many bytes of memory are required.
|
|
* @flags: the type of memory to allocate (see kmalloc).
|
|
*/
|
|
static inline void *kzalloc(size_t size, gfp_t flags)
|
|
{
|
|
return kmalloc(size, flags | __GFP_ZERO);
|
|
}
|
|
|
|
/**
|
|
* kzalloc_node - allocate zeroed memory from a particular memory node.
|
|
* @size: how many bytes of memory are required.
|
|
* @flags: the type of memory to allocate (see kmalloc).
|
|
* @node: memory node from which to allocate
|
|
*/
|
|
static inline void *kzalloc_node(size_t size, gfp_t flags, int node)
|
|
{
|
|
return kmalloc_node(size, flags | __GFP_ZERO, node);
|
|
}
|
|
|
|
/*
|
|
* Determine the size of a slab object
|
|
*/
|
|
static inline unsigned int kmem_cache_size(struct kmem_cache *s)
|
|
{
|
|
return s->object_size;
|
|
}
|
|
|
|
void __init kmem_cache_init_late(void);
|
|
|
|
#endif /* _LINUX_SLAB_H */
|