[PATCH v2 02/12] perf evsel: Support sparse fields in evsel__set_config_if_unset()

[James Clark]

Sparse config fields are technically supported although currently
unused. field_prep() only works for contiguous bitfields so replace it
with pmu_format_value().

Signed-off-by: James Clark <james.clark at linaro.org>
---
 tools/perf/util/pmu.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index 956ea273c2c7..2c26c8d76bed 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -144,6 +144,8 @@ struct perf_pmu_format {
 };
 
 static int pmu_aliases_parse(struct perf_pmu *pmu);
+static void pmu_format_value(unsigned long *format, __u64 value, __u64 *v,
+			     bool zero);
 
 static struct perf_pmu_format *perf_pmu__new_format(struct list_head *list, char *name)
 {
@@ -1381,7 +1383,6 @@ bool evsel__is_aux_event(const struct evsel *evsel)
  * the bit pattern. It is shifted into position by this function, so to set
  * something to true, pass 1 for val rather than a pre shifted value.
  */
-#define field_prep(_mask, _val) (((_val) << (ffsll(_mask) - 1)) & (_mask))
 void evsel__set_config_if_unset(struct perf_pmu *pmu, struct evsel *evsel,
 				const char *config_name, u64 val)
 {
@@ -1398,8 +1399,7 @@ void evsel__set_config_if_unset(struct perf_pmu *pmu, struct evsel *evsel,
 		return;
 
 	/* Otherwise replace it */
-	evsel->core.attr.config &= ~bits;
-	evsel->core.attr.config |= field_prep(bits, val);
+	pmu_format_value(&bits, val, &evsel->core.attr.config, /*zero=*/true);
 }
 
 static struct perf_pmu_format *

-- 
2.34.1