perf tools: Simplify evsel__add_modifier()

Since it doesn't set the exclude_guest, no need to special handle the
bit and simply show only if one of host or guest bit is set.  Now the
default event name might not have :H prefix anymore so change the
dlfilter test not to compare the ":" at the end.

Reviewed-by: Ian Rogers <irogers@google.com>
Reviewed-by: James Clark <james.clark@linaro.org>
Reviewed-by: Ravi Bangoria <ravi.bangoria@amd.com>
Acked-by: Kan Liang <kan.liang@linux.intel.com>
Cc: James Clark <james.clark@arm.com>
Cc: Atish Patra <atishp@atishpatra.org>
Cc: Mingwei Zhang <mizhang@google.com>
Cc: Kajol Jain <kjain@linux.ibm.com>
Cc: Thomas Richter <tmricht@linux.ibm.com>
Cc: Palmer Dabbelt <palmer@rivosinc.com>
Link: https://lore.kernel.org/r/20241016062359.264929-4-namhyung@kernel.org
Signed-off-by: Namhyung Kim <namhyung@kernel.org>

tools/perf/dlfilters/dlfilter-test-api-v0.c

@@ -220,7 +220,7 @@ static int check_sample(struct filter_data *d, const struct perf_dlfilter_sample
 	CHECK_SAMPLE(raw_callchain_nr);
 	CHECK(!sample->raw_callchain);
 
-#define EVENT_NAME "branches:"
+#define EVENT_NAME "branches"
 	CHECK(!strncmp(sample->event, EVENT_NAME, strlen(EVENT_NAME)));
 
 	return 0;

tools/perf/dlfilters/dlfilter-test-api-v2.c

@@ -235,7 +235,7 @@ static int check_sample(struct filter_data *d, const struct perf_dlfilter_sample
 	CHECK_SAMPLE(raw_callchain_nr);
 	CHECK(!sample->raw_callchain);
 
-#define EVENT_NAME "branches:"
+#define EVENT_NAME "branches"
 	CHECK(!strncmp(sample->event, EVENT_NAME, strlen(EVENT_NAME)));
 
 	return 0;

tools/perf/util/evsel.c

@@ -638,7 +638,6 @@ static int evsel__add_modifiers(struct evsel *evsel, char *bf, size_t size)
 {
 	int colon = 0, r = 0;
 	struct perf_event_attr *attr = &evsel->core.attr;
-	bool exclude_guest_default = false;
 
 #define MOD_PRINT(context, mod)	do {					\
 		if (!attr->exclude_##context) {				\
@@ -650,17 +649,15 @@ static int evsel__add_modifiers(struct evsel *evsel, char *bf, size_t size)
 		MOD_PRINT(kernel, 'k');
 		MOD_PRINT(user, 'u');
 		MOD_PRINT(hv, 'h');
-		exclude_guest_default = true;
 	}
 
 	if (attr->precise_ip) {
 		if (!colon)
 			colon = ++r;
 		r += scnprintf(bf + r, size - r, "%.*s", attr->precise_ip, "ppp");
-		exclude_guest_default = true;
 	}
 
-	if (attr->exclude_host || attr->exclude_guest == exclude_guest_default) {
+	if (attr->exclude_host || attr->exclude_guest) {
 		MOD_PRINT(host, 'H');
 		MOD_PRINT(guest, 'G');
 	}