Hello, I tried to build an out-of-tree hardware handler on a RHEL4u2 with the kernel-smp-devel package installed, but found that some headers are not included : drivers/md/dm-hw-handler.h and drivers/md/dm.h. I guess they should be included. Regards, cvaroqui -- dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel