perf annotate: Use perf_env when obtaining the arch name

Paving the way to reuse these routines in other areas, like when
generating errno tables.

Cc: Adrian Hunter <[e-mail]>
Cc: David Ahern <[e-mail]>
Cc: Hendrik Brueckner <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: Michael Petlan <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Cc: Thomas Richter <[e-mail]>
Cc: Wang Nan <[e-mail]>
Link: https://lkml.kernel.org/n/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/util/annotate.c

···
 	return 0;
 }
 
-static const char *annotate__norm_arch(const char *arch_name)
+static const char *perf_env__arch(struct perf_env *env)
 {
 	struct utsname uts;
+	char *arch_name;
 
-	if (!arch_name) { /* Assume we are annotating locally. */
+	if (!env) { /* Assume local operation */
 		if (uname(&uts) < 0)
 			return NULL;
 		arch_name = uts.machine;
-	}
-	return normalize_arch((char *)arch_name);
+	} else
+		arch_name = env->arch;
+
+	return normalize_arch(arch_name);
 }
 
 static int symbol__disassemble(struct symbol *sym, struct annotate_args *args)
···
 		.evsel		= evsel,
 	};
 	struct perf_env *env = perf_evsel__env(evsel);
-	const char *arch_name = NULL;
+	const char *arch_name = perf_env__arch(env);
 	struct arch *arch;
 	int err;
 
-	if (evsel)
-		arch_name = perf_evsel__env_arch(evsel);
-
-	arch_name = annotate__norm_arch(arch_name);
 	if (!arch_name)
 		return -1;
 

tools/perf/util/evsel.c

···
 			 perf_evsel__name(evsel));
 }
 
-char *perf_evsel__env_arch(struct perf_evsel *evsel)
-{
-	if (evsel && evsel->evlist && evsel->evlist->env)
-		return evsel->evlist->env->arch;
-	return NULL;
-}
-
 struct perf_env *perf_evsel__env(struct perf_evsel *evsel)
 {
 	if (evsel && evsel->evlist)

tools/perf/util/evsel.h

···
 int perf_event_attr__fprintf(FILE *fp, struct perf_event_attr *attr,
 			     attr__fprintf_f attr__fprintf, void *priv);
 
-char *perf_evsel__env_arch(struct perf_evsel *evsel);
 struct perf_env *perf_evsel__env(struct perf_evsel *evsel);
 
 #endif /* __PERF_EVSEL_H */