On Mon, Jun 17, 2019 at 10:37:12AM -0700, Dan Williams wrote: > > +struct resource *devm_request_free_mem_region(struct device *dev, > > + struct resource *base, unsigned long size); > > This appears to need a 'static inline' helper stub in the > CONFIG_DEVICE_PRIVATE=n case, otherwise this compile error triggers: > > ld: mm/hmm.o: in function `hmm_devmem_add': > /home/dwillia2/git/linux/mm/hmm.c:1427: undefined reference to > `devm_request_free_mem_region' *sigh* - hmm_devmem_add already only works for device private memory, so it shouldn't be built if that option is not enabled, but in the current code it is. And a few patches later in the series we just kill it off entirely, and the only real caller of this function already depends on CONFIG_DEVICE_PRIVATE. So I'm tempted to just ignore the strict bisectability requirement here instead of making things messy by either adding the proper ifdefs in hmm.c or providing a stub we don't really need.
