> > DAX driver hotplug the device memory and move it to memory zone, these > pages will be marked reserved flag, however, some other kernel componet > will misconceive these pages are reserved mmio (ex: we map these dev_dax > or fs_dax pages to kvm for DIMM/NVDIMM backend). Together with the type > MEMORY_DEVICE_FS_DAX, we can use is_dax_page() to differentiate the pages > is DAX device memory or not. > > Signed-off-by: Zhang Yi <[email protected]> > Signed-off-by: Zhang Yu <[email protected]> > Acked-by: Jan Kara <[email protected]> > --- > include/linux/mm.h | 12 ++++++++++++ > 1 file changed, 12 insertions(+) > > diff --git a/include/linux/mm.h b/include/linux/mm.h > index 68a5121..de5cbc3 100644 > --- a/include/linux/mm.h > +++ b/include/linux/mm.h > @@ -889,6 +889,13 @@ static inline bool is_device_public_page(const struct > page *page) > page->pgmap->type == MEMORY_DEVICE_PUBLIC; > } > > +static inline bool is_dax_page(const struct page *page) > +{ > + return is_zone_device_page(page) && > + (page->pgmap->type == MEMORY_DEVICE_FS_DAX || > + page->pgmap->type == MEMORY_DEVICE_DEV_DAX); > +} > + > #else /* CONFIG_DEV_PAGEMAP_OPS */ > static inline void dev_pagemap_get_ops(void) > { > @@ -912,6 +919,11 @@ static inline bool is_device_public_page(const struct > page *page) > { > return false; > } > + > +static inline bool is_dax_page(const struct page *page) > +{ > + return false; > +} > #endif /* CONFIG_DEV_PAGEMAP_OPS */ > > static inline void get_page(struct page *page) > --
Reviewed-by: Pankaj Gupta <[email protected]> > 2.7.4 > > _______________________________________________ Linux-nvdimm mailing list [email protected] https://lists.01.org/mailman/listinfo/linux-nvdimm
