perf auxtrace: Pass perf_env from session through to mmap read

 auxtrace_mmap__read and auxtrace_mmap__read_snapshot end up calling
 `evsel__env(NULL)` which returns the global perf_env variable for the
 host. Their only call is in perf record. Rather than use the global
 variable pass through the perf_env for `perf record`.

Signed-off-by: Ian Rogers <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Namhyung Kim <[email protected]>

Author: captain5050

tools/perf/builtin-record.c

@@ -775,7 +775,9 @@ static int record__auxtrace_mmap_read(struct record *rec,
 {
 	int ret;
 
-	ret = auxtrace_mmap__read(map, rec->itr, &rec->tool,
+	ret = auxtrace_mmap__read(map, rec->itr,
+				  perf_session__env(rec->session),
+				  &rec->tool,
 				  record__process_auxtrace);
 	if (ret < 0)
 		return ret;
@@ -791,7 +793,9 @@ static int record__auxtrace_mmap_read_snapshot(struct record *rec,
 {
 	int ret;
 
-	ret = auxtrace_mmap__read_snapshot(map, rec->itr, &rec->tool,
+	ret = auxtrace_mmap__read_snapshot(map, rec->itr,
+					   perf_session__env(rec->session),
+					   &rec->tool,
 					   record__process_auxtrace,
 					   rec->opts.auxtrace_snapshot_size);
 	if (ret < 0)

tools/perf/util/auxtrace.c

@@ -1890,7 +1890,7 @@ int __weak compat_auxtrace_mmap__write_tail(struct auxtrace_mmap *mm, u64 tail)
 }
 
 static int __auxtrace_mmap__read(struct mmap *map,
-				 struct auxtrace_record *itr,
+				 struct auxtrace_record *itr, struct perf_env *env,
 				 const struct perf_tool *tool, process_auxtrace_t fn,
 				 bool snapshot, size_t snapshot_size)
 {
@@ -1900,7 +1900,7 @@ static int __auxtrace_mmap__read(struct mmap *map,
 	size_t size, head_off, old_off, len1, len2, padding;
 	union perf_event ev;
 	void *data1, *data2;
-	int kernel_is_64_bit = perf_env__kernel_is_64_bit(evsel__env(NULL));
+	int kernel_is_64_bit = perf_env__kernel_is_64_bit(env);
 
 	head = auxtrace_mmap__read_head(mm, kernel_is_64_bit);
 
@@ -2002,17 +2002,18 @@ static int __auxtrace_mmap__read(struct mmap *map,
 }
 
 int auxtrace_mmap__read(struct mmap *map, struct auxtrace_record *itr,
-			const struct perf_tool *tool, process_auxtrace_t fn)
+			struct perf_env *env, const struct perf_tool *tool,
+			process_auxtrace_t fn)
 {
-	return __auxtrace_mmap__read(map, itr, tool, fn, false, 0);
+	return __auxtrace_mmap__read(map, itr, env, tool, fn, false, 0);
 }
 
 int auxtrace_mmap__read_snapshot(struct mmap *map,
-				 struct auxtrace_record *itr,
+				 struct auxtrace_record *itr, struct perf_env *env,
 				 const struct perf_tool *tool, process_auxtrace_t fn,
 				 size_t snapshot_size)
 {
-	return __auxtrace_mmap__read(map, itr, tool, fn, true, snapshot_size);
+	return __auxtrace_mmap__read(map, itr, env, tool, fn, true, snapshot_size);
 }
 
 /**

tools/perf/util/auxtrace.h

@@ -23,6 +23,7 @@ union perf_event;
 struct perf_session;
 struct evlist;
 struct evsel;
+struct perf_env;
 struct perf_tool;
 struct mmap;
 struct perf_sample;
@@ -512,10 +513,11 @@ typedef int (*process_auxtrace_t)(const struct perf_tool *tool,
 				  size_t len1, void *data2, size_t len2);
 
 int auxtrace_mmap__read(struct mmap *map, struct auxtrace_record *itr,
-			const struct perf_tool *tool, process_auxtrace_t fn);
+			struct perf_env *env, const struct perf_tool *tool,
+			process_auxtrace_t fn);
 
 int auxtrace_mmap__read_snapshot(struct mmap *map,
-				 struct auxtrace_record *itr,
+				 struct auxtrace_record *itr, struct perf_env *env,
 				 const struct perf_tool *tool, process_auxtrace_t fn,
 				 size_t snapshot_size);