C++ (Cpp) __alloc_percpu_gfp Examples

Example #1

File: arraymap.c Project: robeat101/linux

static int bpf_array_alloc_percpu(struct bpf_array *array)
{
    void __percpu *ptr;
    int i;

    for (i = 0; i < array->map.max_entries; i++) {
        ptr = __alloc_percpu_gfp(array->elem_size, 8,
                                 GFP_USER | __GFP_NOWARN);
        if (!ptr) {
            bpf_array_free_percpu(array);
            return -ENOMEM;
        }
        array->pptrs[i] = ptr;
    }

    return 0;
}

Example #2

File: percpu-refcount.c Project: markus-oberhumer/linux

 * Initializes @ref.  If @flags is zero, @ref starts in percpu mode with a
 * refcount of 1; analagous to atomic_long_set(ref, 1).  See the
 * definitions of PERCPU_REF_INIT_* flags for flag behaviors.
 *
 * Note that @release must not sleep - it may potentially be called from RCU
 * callback context by percpu_ref_kill().
 */
int percpu_ref_init(struct percpu_ref *ref, percpu_ref_func_t *release,
		    unsigned int flags, gfp_t gfp)
{
	size_t align = max_t(size_t, 1 << __PERCPU_REF_FLAG_BITS,
			     __alignof__(unsigned long));
	unsigned long start_count = 0;

	ref->percpu_count_ptr = (unsigned long)
		__alloc_percpu_gfp(sizeof(unsigned long), align, gfp);
	if (!ref->percpu_count_ptr)
		return -ENOMEM;

	ref->force_atomic = flags & PERCPU_REF_INIT_ATOMIC;

	if (flags & (PERCPU_REF_INIT_ATOMIC | PERCPU_REF_INIT_DEAD))
		ref->percpu_count_ptr |= __PERCPU_REF_ATOMIC;
	else
		start_count += PERCPU_COUNT_BIAS;

	if (flags & PERCPU_REF_INIT_DEAD)
		ref->percpu_count_ptr |= __PERCPU_REF_DEAD;
	else
		start_count++;