tracing_map_create

Name:racing_map_create - Create a lock-free map and element pool*@map_bits: The size of the map (2 ** map_bits)*@key_size: The size of the key for the map in bytes*@ops: Optional client-defined tracing_map_ops instance*@private_data: Client data associated

Proto:struct tracing_map *tracing_map_create(unsigned int map_bits, unsigned int key_size, const struct tracing_map_ops *ops, void *private_data)

Type:struct tracing_map

Parameter:

Type	Parameter	Name
unsigned int	map_bits
unsigned int	key_size
const struct tracing_map_ops *	ops
void *	private_data

768

If map_bits < TRACING_MAP_BITS_MIN || map_bits > TRACING_MAP_BITS_MAX Then Return ERR_PTR( - EINVAL)

772

map = 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).

773

If Not map Then Return ERR_PTR( - ENOMEM)

776

map_bits = map_bits

777

max_elts = 1 << map_bits

778

atomic_set( & next_elt, - 1)

780

map_size = 1 << map_bits + 1

781

ops = ops

783

private_data = private_data

785

map = tracing_map_array_alloc(map_size, sizeof(structtracing_map_entry))

787

If Not map Then Go to free

790

key_size = key_size

791

When i < TRACING_MAP_KEYS_MAX cycle key_idx[i] = -1

793

out :

794

Return map

795

free :

796

racing_map_destroy - Destroy a tracing_map*@map: The tracing_map to destroy* Frees a tracing_map along with its associated array of* tracing_map_elts.* Callers should make sure there are no readers or writers actively

797

map = ERR_PTR( - ENOMEM)

799

Go to out

**Caller**
Name	Describe
create_hist_data

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