__sym_calloc_dma
np = __sym_calloc_dma(&pdev->dev, sizeof(*np), "HCB");
void *__sym_calloc_dma(m_pool_ident_t dev_dmat, int size, char *name);
#define _sym_calloc_dma(np, l, n) __sym_calloc_dma(np->bus_dmat, l, n)