[PATCH v5 02/19] perf map: Constify objdump offset/address conversion APIs

[Ian Rogers <irogers@google.com>]

Make the map argument const as the conversion act won't modify the map
and this allows other callers to use a const struct map.

Signed-off-by: Ian Rogers <irogers@google.com>
---
 tools/perf/util/map.c | 19 +++++++++++++++----
 tools/perf/util/map.h |  6 +++---
 2 files changed, 18 insertions(+), 7 deletions(-)

diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
index b46c68c24d1c..41cdddc987ee 100644
--- a/tools/perf/util/map.c
+++ b/tools/perf/util/map.c
@@ -513,6 +513,8 @@ void srccode_state_free(struct srccode_state *state)
 	state->line = 0;
 }
 
+static const struct kmap *__map__const_kmap(const struct map *map);
+
 /**
  * map__rip_2objdump - convert symbol start address to objdump address.
  * @map: memory map
@@ -524,9 +526,9 @@ void srccode_state_free(struct srccode_state *state)
  *
  * Return: Address suitable for passing to "objdump --start-address="
  */
-u64 map__rip_2objdump(struct map *map, u64 rip)
+u64 map__rip_2objdump(const struct map *map, u64 rip)
 {
-	struct kmap *kmap = __map__kmap(map);
+	const struct kmap *kmap = __map__const_kmap(map);
 	const struct dso *dso = map__dso(map);
 
 	/*
@@ -569,7 +571,7 @@ u64 map__rip_2objdump(struct map *map, u64 rip)
  *
  * Return: Memory address.
  */
-u64 map__objdump_2mem(struct map *map, u64 ip)
+u64 map__objdump_2mem(const struct map *map, u64 ip)
 {
 	const struct dso *dso = map__dso(map);
 
@@ -586,7 +588,7 @@ u64 map__objdump_2mem(struct map *map, u64 ip)
 }
 
 /* convert objdump address to relative address.  (To be removed) */
-u64 map__objdump_2rip(struct map *map, u64 ip)
+u64 map__objdump_2rip(const struct map *map, u64 ip)
 {
 	const struct dso *dso = map__dso(map);
 
@@ -618,6 +620,15 @@ struct kmap *__map__kmap(struct map *map)
 	return (struct kmap *)(&RC_CHK_ACCESS(map)[1]);
 }
 
+static const struct kmap *__map__const_kmap(const struct map *map)
+{
+	const struct dso *dso = map__dso(map);
+
+	if (!dso || !dso__kernel(dso))
+		return NULL;
+	return (struct kmap *)(&RC_CHK_ACCESS(map)[1]);
+}
+
 struct kmap *map__kmap(struct map *map)
 {
 	struct kmap *kmap = __map__kmap(map);
diff --git a/tools/perf/util/map.h b/tools/perf/util/map.h
index 9cadf533a561..979b3e11b9bc 100644
--- a/tools/perf/util/map.h
+++ b/tools/perf/util/map.h
@@ -133,13 +133,13 @@ static inline u64 map__unmap_ip(const struct map *map, u64 ip_or_rip)
 }
 
 /* rip/ip <-> addr suitable for passing to `objdump --start-address=` */
-u64 map__rip_2objdump(struct map *map, u64 rip);
+u64 map__rip_2objdump(const struct map *map, u64 rip);
 
 /* objdump address -> memory address */
-u64 map__objdump_2mem(struct map *map, u64 ip);
+u64 map__objdump_2mem(const struct map *map, u64 ip);
 
 /* objdump address -> rip */
-u64 map__objdump_2rip(struct map *map, u64 ip);
+u64 map__objdump_2rip(const struct map *map, u64 ip);
 
 struct symbol;
 struct thread;
-- 
2.51.0.rc2.233.g662b1ed5c5-goog