On 01/09/2017 01:19 AM, Balbir Singh wrote: >> + /* >> + * This should never happen ! Page from ZONE_DEVICE always must have an >> + * active refcount. Complain about it and try to restore the refcount. >> + */ >> + if (is_zone_device_page(page)) { >> + VM_BUG_ON_PAGE(is_zone_device_page(page), page); > This can be VM_BUG_ON_PAGE(1, page), hopefully the compiler does the right > thing > here. I suspect this should be a BUG_ON, independent of CONFIG_DEBUG_VM
BUG_ON() means "kill the machine dead". Do we really want a guaranteed dead machine if someone screws up their refcounting?