On Thu, Sep 27, 2018 at 12:39 PM <yang.shi@xxxxxxxxxxxxxxxxx> wrote: > > The comment for PFN_SPECIAL is missed in pfn_t.h. Add comment to get > consistent with other pfn flags. > > Cc: Dan Williams <dan.j.williams@xxxxxxxxx> > Signed-off-by: Yang Shi <yang.shi@xxxxxxxxxxxxxxxxx> > --- > include/linux/pfn_t.h | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/include/linux/pfn_t.h b/include/linux/pfn_t.h > index 21713dc..d2e5dd4 100644 > --- a/include/linux/pfn_t.h > +++ b/include/linux/pfn_t.h > @@ -9,6 +9,7 @@ > * PFN_SG_LAST - pfn references a page and is the last scatterlist entry > * PFN_DEV - pfn is not covered by system memmap by default > * PFN_MAP - pfn has a dynamic page mapping established by a device driver > + * PFN_SPECIAL - indicates that _PAGE_SPECIAL should be used for DAX ptes That's not quite accurate, I would change this to: PFN_SPECIAL - for CONFIG_FS_DAX_LIMITED builds to allow XIP, but not get_user_pages.
