perf annotate: Allow arches to specify functions to skip

This is to cope with an ARM specific kludge introduced in the original
patch supporting ARM annotation, cfef25b8daf7 ("perf annotate: ARM
support") that made functions with a '+' in its name to be skipped when
processing call instructions.

With this patchkit it should be possible to collect a perf.data file on
a ARM machine and then annotate it on a x86 workstation and have those
ARM kludges used.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Chris Riyder <chris.ryder@arm.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kim Phillips <kim.phillips@arm.com>
Cc: Markus Trippelsdorf <markus@trippelsdorf.de>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Cc: Pawel Moll <pawel.moll@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com>
Cc: Russell King <rmk+kernel@arm.linux.org.uk>
Cc: Taeung Song <treeze.taeung@gmail.com>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-2fi3sy7q3sssdi7m7cbe07gy@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/annotate.c

@@ -35,6 +35,7 @@ struct arch {
 	const char	*name;
 	struct		{
 		char comment_char;
+		char skip_functions_char;
 	} objdump;
 };
 
@@ -43,6 +44,7 @@ static struct arch architectures[] = {
 		.name = "arm",
 		.objdump =  {
 			.comment_char = ';',
+			.skip_functions_char = '+',
 		},
 	},
 	{
@@ -78,7 +80,7 @@ int ins__scnprintf(struct ins *ins, char *bf, size_t size,
 	return ins__raw_scnprintf(ins, bf, size, ops);
 }
 
-static int call__parse(struct arch *arch __maybe_unused, struct ins_operands *ops, struct map *map)
+static int call__parse(struct arch *arch, struct ins_operands *ops, struct map *map)
 {
 	char *endptr, *tok, *name;
 
@@ -90,10 +92,9 @@ static int call__parse(struct arch *arch __maybe_unused, struct ins_operands *op
 
 	name++;
 
-#ifdef __arm__
-	if (strchr(name, '+'))
+	if (arch->objdump.skip_functions_char &&
+	    strchr(name, arch->objdump.skip_functions_char))
 		return -1;
-#endif
 
 	tok = strchr(name, '>');
 	if (tok == NULL)