PP_SIGNATURE
#define PP_DMA_INDEX_SHIFT (1 + __fls(PP_SIGNATURE - POISON_POINTER_DELTA))
return (page->pp_magic & PP_MAGIC_MASK) == PP_SIGNATURE;
return (netmem_get_pp_magic(netmem) & PP_MAGIC_MASK) == PP_SIGNATURE;
netmem_or_pp_magic(netmem, PP_SIGNATURE);