Before enabling warnings through HOSTCFLAGS, fix the would-be warnings:

  HOSTCC  pmu-events/jevents.o
pmu-events/jevents.c:74:22: warning: no previous prototype for ‘convert’ [-Wmissing-prototypes]
   74 | enum aggr_mode_class convert(const char *aggr_mode)
      |                      ^~~~~~~
pmu-events/jevents.c: In function ‘print_events_table_entry’:
pmu-events/jevents.c:373:8: warning: declaration of ‘topic’ shadows a global declaration [-Wshadow]
  373 |  char *topic = pd->topic;
      |        ^~~~~
pmu-events/jevents.c:316:14: note: shadowed declaration is here
  316 | static char *topic;
      |              ^~~~~
pmu-events/jevents.c: In function ‘json_events’:
pmu-events/jevents.c:554:9: warning: declaration of ‘func’ shadows a global declaration [-Wshadow]
  554 |   int (*func)(void *data, struct json_event *je),
      |   ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
pmu-events/jevents.c:85:15: note: shadowed declaration is here
   85 | typedef int (*func)(void *data, struct json_event *je);
      |               ^~~~
pmu-events/jevents.c: In function ‘main’:
pmu-events/jevents.c:1211:25: warning: initialization discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
 1211 |  char *err_string_ext = "";
      |                         ^~
pmu-events/jevents.c:1304:17: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
 1304 |  err_string_ext = " for std arch event";
      |                 ^

Signed-off-by: John Garry <redacted>
---
 tools/perf/pmu-events/jevents.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/tools/perf/pmu-events/jevents.c b/tools/perf/pmu-events/jevents.c
index 19497e4f8a86..b6bd33d85066 100644
--- a/tools/perf/pmu-events/jevents.c
+++ b/tools/perf/pmu-events/jevents.c

@@ -71,7 +71,7 @@ struct json_event {
 	char *metric_constraint;
 };
 
-enum aggr_mode_class convert(const char *aggr_mode)
+static enum aggr_mode_class convert(const char *aggr_mode)
 {
 	if (!strcmp(aggr_mode, "PerCore"))
 		return PerCore;

@@ -82,8 +82,6 @@ enum aggr_mode_class convert(const char *aggr_mode)
 	return -1;
 }
 
-typedef int (*func)(void *data, struct json_event *je);
-
 static LIST_HEAD(sys_event_tables);
 
 struct sys_event_table {

@@ -370,7 +368,7 @@ static int print_events_table_entry(void *data, struct json_event *je)
 {
 	struct perf_entry_data *pd = data;
 	FILE *outfp = pd->outfp;
-	char *topic = pd->topic;
+	char *topic_local = pd->topic;
 
 	/*
 	 * TODO: Remove formatting chars after debugging to reduce

@@ -385,7 +383,7 @@ static int print_events_table_entry(void *data, struct json_event *je)
 	fprintf(outfp, "\t.desc = \"%s\",\n", je->desc);
 	if (je->compat)
 		fprintf(outfp, "\t.compat = \"%s\",\n", je->compat);
-	fprintf(outfp, "\t.topic = \"%s\",\n", topic);
+	fprintf(outfp, "\t.topic = \"%s\",\n", topic_local);
 	if (je->long_desc && je->long_desc[0])
 		fprintf(outfp, "\t.long_desc = \"%s\",\n", je->long_desc);
 	if (je->pmu)

@@ -1208,7 +1206,7 @@ int main(int argc, char *argv[])
 	const char *arch;
 	const char *output_file;
 	const char *start_dirname;
-	char *err_string_ext = "";
+	const char *err_string_ext = "";
 	struct stat stbuf;
 
 	prog = basename(argv[0]);

-- 
2.26.2