* s390-nat.c (s390_can_use_hw_breakpoint): Only support breakpoints
of type bp_hardware_watchpoint.
gdb/testsuite/
* gdb.base/hbreak.exp: Disable for s390*-*-* targets.
* gdb.base/watchpoint-hw-hit-once.exp: Likewise.
* gdb.threads/watchthreads-reorder.exp: Likewise.