perf scripts python: Let script to be python2 compliant

The mainline kernel can be used for relative old distros, e.g. RHEL 7.
The distro doesn't upgrade from python2 to python3, this causes the
building error that the python script is not python2 compliant.

To fix the building failure, this patch changes from the python f-string
format to traditional string format.

Fixes: 12fdd6c009da0d02 ("perf scripts python: Support Arm CoreSight trace data disassembly")
Reported-by: Akemi Yagi <[e-mail]>
Signed-off-by: Leo Yan <[e-mail]>
Cc: Alexander Shishkin <[e-mail]>
Cc: ElRepo <[e-mail]>
Cc: Ian Rogers <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: Leo Yan <[e-mail]>
Cc: Mark Rutland <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/scripts/python/arm-cs-trace-disasm.py

···
 
 def get_offset(perf_dict, field):
 	if field in perf_dict:
-		return f"+0x{perf_dict[field]:x}"
+		return "+%#x" % perf_dict[field]
 	return ""
 
 def get_dso_file_path(dso_name, dso_build_id):
···
 	else:
 		append = "/elf"
 
-	dso_path = f"{os.environ['PERF_BUILDID_DIR']}/{dso_name}/{dso_build_id}{append}"
+	dso_path = os.environ['PERF_BUILDID_DIR'] + "/" + dso_name + "/" + dso_build_id + append;
 	# Replace duplicate slash chars to single slash char
 	dso_path = dso_path.replace('//', '/', 1)
 	return dso_path
···
 		start_addr = start_addr - dso_start;
 		stop_addr = stop_addr - dso_start;
 		disasm = [ options.objdump_name, "-d", "-z",
-			   f"--start-address=0x{start_addr:x}",
-			   f"--stop-address=0x{stop_addr:x}" ]
+			   "--start-address="+format(start_addr,"#x"),
+			   "--stop-address="+format(stop_addr,"#x") ]
 		disasm += [ dso_fname ]
 		disasm_output = check_output(disasm).decode('utf-8').split('\n')
 		disasm_cache[addr_range] = disasm_output
···
 			m = disasm_re.search(line)
 			if m is None:
 				continue
-		print(f"\t{line}")
+		print("\t" + line)
 
 def print_sample(sample):
-	print(f"Sample = {{ cpu: {sample['cpu']:04} addr: 0x{sample['addr']:016x} " \
-	      f"phys_addr: 0x{sample['phys_addr']:016x} ip: 0x{sample['ip']:016x} " \
-	      f"pid: {sample['pid']} tid: {sample['tid']} period: {sample['period']} time: {sample['time']} }}")
+	print("Sample = { cpu: %04d addr: 0x%016x phys_addr: 0x%016x ip: 0x%016x " \
+	      "pid: %d tid: %d period: %d time: %d }" % \
+	      (sample['cpu'], sample['addr'], sample['phys_addr'], \
+	       sample['ip'], sample['pid'], sample['tid'], \
+	       sample['period'], sample['time']))
 
 def trace_begin():
 	print('ARM CoreSight Trace Data Assembler Dump')
···
 	cpu = sample["cpu"]
 	pid = sample["pid"]
 	tid = sample["tid"]
-	return f"{comm:>16} {pid:>5}/{tid:<5} [{cpu:04}] {sec:9}.{ns:09}  "
+	return "%16s %5u/%-5u [%04u] %9u.%09u  " % (comm, pid, tid, cpu, sec, ns)
 
 # This code is copied from intel-pt-events.py for printing source code
 # line and symbols.
···
 	glb_line_number = line_number
 	glb_source_file_name = source_file_name
 
-	print(f"{start_str}{src_str}")
+	print(start_str, src_str)
 
 def process_event(param_dict):
 	global cache_size
···
 	symbol = get_optional(param_dict, "symbol")
 
 	if (options.verbose == True):
-		print(f"Event type: {name}")
+		print("Event type: %s" % name)
 		print_sample(sample)
 
 	# If cannot find dso so cannot dump assembler, bail out
···
 
 	# Validate dso start and end addresses
 	if ((dso_start == '[unknown]') or (dso_end == '[unknown]')):
-		print(f"Failed to find valid dso map for dso {dso}")
+		print("Failed to find valid dso map for dso %s" % dso)
 		return
 
 	if (name[0:12] == "instructions"):
···
 
 	# Handle CS_ETM_TRACE_ON packet if start_addr=0 and stop_addr=4
 	if (start_addr == 0 and stop_addr == 4):
-		print(f"CPU{cpu}: CS_ETM_TRACE_ON packet is inserted")
+		print("CPU%d: CS_ETM_TRACE_ON packet is inserted" % cpu)
 		return
 
 	if (start_addr < int(dso_start) or start_addr > int(dso_end)):
-		print(f"Start address 0x{start_addr:x} is out of range [ 0x{dso_start:x} .. 0x{dso_end:x} ] for dso {dso}")
+		print("Start address 0x%x is out of range [ 0x%x .. 0x%x ] for dso %s" % (start_addr, int(dso_start), int(dso_end), dso))
 		return
 
 	if (stop_addr < int(dso_start) or stop_addr > int(dso_end)):
-		print(f"Stop address 0x{stop_addr:x} is out of range [ 0x{dso_start:x} .. 0x{dso_end:x} ] for dso {dso}")
+		print("Stop address 0x%x is out of range [ 0x%x .. 0x%x ] for dso %s" % (stop_addr, int(dso_start), int(dso_end), dso))
 		return
 
 	if (options.objdump_name != None):
···
 		if path.exists(dso_fname):
 			print_disam(dso_fname, dso_vm_start, start_addr, stop_addr)
 		else:
-			print(f"Failed to find dso {dso} for address range [ 0x{start_addr:x} .. 0x{stop_addr:x} ]")
+			print("Failed to find dso %s for address range [ 0x%x .. 0x%x ]" % (dso, start_addr, stop_addr))
 
 	print_srccode(comm, param_dict, sample, symbol, dso)