On Thu, 22 Jan 2026 04:55:41 +0000 Smita Koralahalli <[email protected]> wrote:
> Introduce dax_cxl_mode to coordinate between dax_cxl and dax_hmem when > handling CXL tagged memory ranges. > > This patch defines the dax_cxl_mode enum and establishes a default policy. > Subsequent patches will wire this into dax_cxl and dax_hmem to decide > whether CXL tagged memory ranges should be deferred, registered or > dropped. > > No functional changes. > > Signed-off-by: Smita Koralahalli <[email protected]> > --- > drivers/dax/bus.c | 3 +++ > drivers/dax/bus.h | 8 ++++++++ > 2 files changed, 11 insertions(+) > > diff --git a/drivers/dax/bus.c b/drivers/dax/bus.c > index fde29e0ad68b..72bc5b76f061 100644 > --- a/drivers/dax/bus.c > +++ b/drivers/dax/bus.c > @@ -24,6 +24,9 @@ DECLARE_RWSEM(dax_region_rwsem); > */ > DECLARE_RWSEM(dax_dev_rwsem); > > +enum dax_cxl_mode dax_cxl_mode = DAX_CXL_MODE_DEFER; > +EXPORT_SYMBOL_GPL(dax_cxl_mode); > + > #define DAX_NAME_LEN 30 > struct dax_id { > struct list_head list; > diff --git a/drivers/dax/bus.h b/drivers/dax/bus.h > index cbbf64443098..a40cbbf1e26b 100644 > --- a/drivers/dax/bus.h > +++ b/drivers/dax/bus.h > @@ -41,6 +41,14 @@ struct dax_device_driver { > void (*remove)(struct dev_dax *dev); > }; > > +enum dax_cxl_mode { I'd suggest kernel-doc for these. Their meaning isn't entirely obvious from the names. > + DAX_CXL_MODE_DEFER, > + DAX_CXL_MODE_REGISTER, > + DAX_CXL_MODE_DROP, > +}; > + > +extern enum dax_cxl_mode dax_cxl_mode; > + > int __dax_driver_register(struct dax_device_driver *dax_drv, > struct module *module, const char *mod_name); > #define dax_driver_register(driver) \
