static void binder_delete_free_buffer()

in binder_alloc.c [603:650]

• 44 lines of code
• 7 McCabe index (conditional complexity)

static void binder_delete_free_buffer(struct binder_alloc *alloc,
				      struct binder_buffer *buffer)
{
	struct binder_buffer *prev, *next = NULL;
	bool to_free = true;

	BUG_ON(alloc->buffers.next == &buffer->entry);
	prev = binder_buffer_prev(buffer);
	BUG_ON(!prev->free);
	if (prev_buffer_end_page(prev) == buffer_start_page(buffer)) {
		to_free = false;
		binder_alloc_debug(BINDER_DEBUG_BUFFER_ALLOC,
				   "%d: merge free, buffer %pK share page with %pK\n",
				   alloc->pid, buffer->user_data,
				   prev->user_data);
	}

	if (!list_is_last(&buffer->entry, &alloc->buffers)) {
		next = binder_buffer_next(buffer);
		if (buffer_start_page(next) == buffer_start_page(buffer)) {
			to_free = false;
			binder_alloc_debug(BINDER_DEBUG_BUFFER_ALLOC,
					   "%d: merge free, buffer %pK share page with %pK\n",
					   alloc->pid,
					   buffer->user_data,
					   next->user_data);
		}
	}

	if (PAGE_ALIGNED(buffer->user_data)) {
		binder_alloc_debug(BINDER_DEBUG_BUFFER_ALLOC,
				   "%d: merge free, buffer start %pK is page aligned\n",
				   alloc->pid, buffer->user_data);
		to_free = false;
	}

	if (to_free) {
		binder_alloc_debug(BINDER_DEBUG_BUFFER_ALLOC,
				   "%d: merge free, buffer %pK do not share page with %pK or %pK\n",
				   alloc->pid, buffer->user_data,
				   prev->user_data,
				   next ? next->user_data : NULL);
		binder_update_page_range(alloc, 0, buffer_start_page(buffer),
					 buffer_start_page(buffer) + PAGE_SIZE);
	}
	list_del(&buffer->entry);
	kfree(buffer);
}