tools/power turbostat: Move debug prints from stdout to stderr

This leaves the stdout cleaner, having only counter data. It makes it
easier for programs to parse the output of turbostat, for example
selftests.

Signed-off-by: Patryk Wlazlyn <patryk.wlazlyn@linux.intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

Author: Patryk Wlazlyn

tools/power/x86/turbostat/turbostat.c

@@ -1984,6 +1984,7 @@ void help(void)
 		"  -c, --cpu	cpu-set	limit output to summary plus cpu-set:\n"
 		"		  {core | package | j,k,l..m,n-p }\n"
 		"  -d, --debug	displays usec, Time_Of_Day_Seconds and more debugging\n"
+		"		debug messages are printed to stderr\n"
 		"  -D, --Dump	displays the raw counter values\n"
 		"  -e, --enable	[all | column]\n"
 		"		shows all or the specified disabled column\n"
@@ -8262,7 +8263,7 @@ int added_perf_counters_init_(struct perf_counter_info *pinfo)
 			pinfo->scale = perf_scale;
 
 			if (debug)
-				printf("Add perf/%s/%s cpu%d: %d\n",
+				fprintf(stderr, "Add perf/%s/%s cpu%d: %d\n",
 				       pinfo->device, pinfo->event, cpu, pinfo->fd_perf_per_domain[next_domain]);
 		}
 
@@ -8422,7 +8423,7 @@ struct msr_counter *find_msrp_by_name(struct msr_counter *head, char *name)
 
 	for (mp = head; mp; mp = mp->next) {
 		if (debug)
-			printf("%s: %s %s\n", __func__, name, mp->name);
+			fprintf(stderr, "%s: %s %s\n", __func__, name, mp->name);
 		if (!strncmp(name, mp->name, strlen(mp->name)))
 			return mp;
 	}
@@ -8439,16 +8440,16 @@ int add_counter(unsigned int msr_num, char *path, char *name,
 		errx(1, "Requested MSR counter 0x%x, but in --no-msr mode", msr_num);
 
 	if (debug)
-		printf("%s(msr%d, %s, %s, width%d, scope%d, type%d, format%d, flags%x, id%d)\n", __func__, msr_num,
-		       path, name, width, scope, type, format, flags, id);
+		fprintf(stderr, "%s(msr%d, %s, %s, width%d, scope%d, type%d, format%d, flags%x, id%d)\n",
+			__func__, msr_num, path, name, width, scope, type, format, flags, id);
 
 	switch (scope) {
 
 	case SCOPE_CPU:
 		msrp = find_msrp_by_name(sys.tp, name);
 		if (msrp) {
 			if (debug)
-				printf("%s: %s FOUND\n", __func__, name);
+				fprintf(stderr, "%s: %s FOUND\n", __func__, name);
 			break;
 		}
 		if (sys.added_thread_counters++ >= MAX_ADDED_THREAD_COUNTERS) {
@@ -8460,7 +8461,7 @@ int add_counter(unsigned int msr_num, char *path, char *name,
 		msrp = find_msrp_by_name(sys.cp, name);
 		if (msrp) {
 			if (debug)
-				printf("%s: %s FOUND\n", __func__, name);
+				fprintf(stderr, "%s: %s FOUND\n", __func__, name);
 			break;
 		}
 		if (sys.added_core_counters++ >= MAX_ADDED_CORE_COUNTERS) {
@@ -8472,7 +8473,7 @@ int add_counter(unsigned int msr_num, char *path, char *name,
 		msrp = find_msrp_by_name(sys.pp, name);
 		if (msrp) {
 			if (debug)
-				printf("%s: %s FOUND\n", __func__, name);
+				fprintf(stderr, "%s: %s FOUND\n", __func__, name);
 			break;
 		}
 		if (sys.added_package_counters++ >= MAX_ADDED_PACKAGE_COUNTERS) {
@@ -8617,7 +8618,7 @@ int add_perf_counter(const char *perf_device, const char *perf_event, const char
 
 	// FIXME: we might not have debug here yet
 	if (debug)
-		printf("%s: %s/%s, name: %s, scope%d\n",
+		fprintf(stderr, "%s: %s/%s, name: %s, scope%d\n",
 		       __func__, pinfo->device, pinfo->event, pinfo->name, pinfo->scope);
 
 	return 0;