perf tools: Address python 3.6 DeprecationWarning for string scapes

Python 3.6 introduced a DeprecationWarning for invalid escape sequences.
This is upgraded to a SyntaxWarning in Python 3.12, and will eventually
be a syntax error.

Fix these now to get ahead of it before it's an error.

Signed-off-by: Benjamin Gray <[e-mail]>
Acked-by: Adrian Hunter <[e-mail]>
Cc: Alexander Shishkin <[e-mail]>
Cc: Andrii Nakryiko <[e-mail]>
Cc: Hartley Sweeten <[e-mail]>
Cc: Ian Abbott <[e-mail]>
Cc: Ian Rogers <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: Jan Kiszka <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: Jonathan Corbet <[e-mail]>
Cc: Kieran Bingham <[e-mail]>
Cc: Mark Rutland <[e-mail]>
Cc: Mykola Lysenko <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Cc: Nathan Chancellor <[e-mail]>
Cc: Nick Desaulniers <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: Shuah Khan <[e-mail]>
Cc: Todd E Brandt <[e-mail]>
Cc: Tom Rix <[e-mail]>
Cc: [e-mail]
Cc: [e-mail]
Cc: [e-mail]
Cc: [e-mail]
Cc: [e-mail]
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/pmu-events/jevents.py

···
   """Return the length of s a C string
 
   This doesn't handle all escape characters properly. It first assumes
-  all \ are for escaping, it then adjusts as it will have over counted
+  all \\ are for escaping, it then adjusts as it will have over counted
   \\. The code uses \000 rather than \0 as a terminator as an adjacent
   number would be folded into a string of \0 (ie. "\0" + "5" doesn't
   equal a terminator followed by the number 5 but the escape of

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

···
 # Initialize global dicts and regular expression
 disasm_cache = dict()
 cpu_data = dict()
-disasm_re = re.compile("^\s*([0-9a-fA-F]+):")
-disasm_func_re = re.compile("^\s*([0-9a-fA-F]+)\s.*:")
+disasm_re = re.compile(r"^\s*([0-9a-fA-F]+):")
+disasm_func_re = re.compile(r"^\s*([0-9a-fA-F]+)\s.*:")
 cache_size = 64*1024
 
 glb_source_file_name	= None

tools/perf/scripts/python/compaction-times.py

···
 
 comm_re = None
 pid_re = None
-pid_regex = "^(\d*)-(\d*)$|^(\d*)$"
+pid_regex = r"^(\d*)-(\d*)$|^(\d*)$"
 
 opt_proc = popt.DISP_DFL
 opt_disp = topt.DISP_ALL

tools/perf/scripts/python/exported-sql-viewer.py

···
 			#   sqlite supports GLOB (text only) which uses * and ? and is case sensitive
 			if not self.glb.dbref.is_sqlite3:
 				# Escape % and _
-				s = value.replace("%", "\%")
-				s = s.replace("_", "\_")
+				s = value.replace("%", "\\%")
+				s = s.replace("_", "\\_")
 				# Translate * and ? into SQL LIKE pattern characters % and _
 				trans = string.maketrans("*?", "%_")
 				match = " LIKE '" + str(s).translate(trans) + "'"