On 10/28/21 8:45 AM, Dan Williams wrote: > The /sys/class/dax compatibility option has shipped in the kernel for 4 > years now which should be sufficient time for tools to abandon the old > ABI in favor of the /sys/bus/dax device-model. Delete it now and see if > anyone screams. > > Since this compatibility option shipped there has been more reports of > users being surprised by the compat ABI than surprised by the "new", so > the compat infrastructure has outlived its usefulness. Recall that > /sys/bus/dax device-model is required for the dax kmem driver which > allows PMEM to be used as "System RAM". > > Cc: Ira Weiny <ira.weiny@xxxxxxxxx> > Cc: Dave Jiang <dave.jiang@xxxxxxxxx> The compat module has bitten me more than once, and confused more than one end user who tried to use the kmem facility. It's definitely a liability: Acked-by: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
