tools/power/x86/intel-speed-select: Special handling for CPU 0 online…

…/offline When "-o" option for force online/offline is used with command: perf-profile set-config-level If the config level calls for CPU 0 online/offline, then call fails as there is special kernel setup required for CPU 0 online/offline and the currently not setup for that. But when call is for online CPU 0, then don't fail. Just warn that this system is not setup for CPU 0 online/offline. Signed-off-by: Srinivas Pandruvada <[email protected]> Signed-off-by: Andy Shevchenko <[email protected]>
laijs · Mar 20, 2020 · 6966919 · 6966919
1 parent 6320c9f
commit 6966919
Showing 1 changed file with 7 additions and 1 deletion.
diff --git a/tools/power/x86/intel-speed-select/isst-config.c b/tools/power/x86/intel-speed-select/isst-config.c
@@ -220,8 +220,14 @@ static void set_cpu_online_offline(int cpu, int state)
 		 "/sys/devices/system/cpu/cpu%d/online", cpu);
 
 	fd = open(buffer, O_WRONLY);
-	if (fd < 0)
+	if (fd < 0) {
+		if (!cpu && state) {
+			fprintf(stderr, "This system is not configured for CPU 0 online/offline\n");
+			fprintf(stderr, "Ignoring online request for CPU 0 as this is already online\n");
+			return;
+		}
 		err(-1, "%s open failed", buffer);
+	}
 
 	if (state)
 		ret = write(fd, "1\n", 2);