* target.c (update_current_target): Change the default action of 'to_traceframe_info' from tcomplain to return_zero. * target.h (struct target_ops) <to_traceframe_info>: Add more comments. * valops.c (read_value_memory): Call traceframe_available_memory unconditionally. gdb/testsuite/ * gdb.trace/read-memory.exp (test_from_remote): Update test. (teset_from_exec): Likewise.