tools/power turbostat: Use sched_getcpu() instead of hardcoded cpu 0

Disabling cpu 0 results in an error

turbostat: /sys/devices/system/cpu/cpu0/topology/thread_siblings: open failed: No such file or directory

Use sched_getcpu() instead of a hardcoded cpu 0 to get the max cpu number.

Signed-off-by: Prarit Bhargava <prarit@redhat.com>
Signed-off-by: Len Brown <len.brown@intel.com>

diff --git a/tools/power/x86/turbostat/turbostat.c b/tools/power/x86/turbostat/turbostat.c
index 66c4682620200e4e6351422a5c7773a0780d1917..151a70f2311bc8fb08abf83ac5e907e79faec5e3 100644 (file)
--- a/tools/power/x86/turbostat/turbostat.c
+++ b/tools/power/x86/turbostat/turbostat.c
@@ -2865,12 +2865,19 @@ void re_initialize(void)
 void set_max_cpu_num(void)
 {
        FILE *filep;
+       int base_cpu;
        unsigned long dummy;
+       char pathname[64];
 
+       base_cpu = sched_getcpu();
+       if (base_cpu < 0)
+               err(1, "cannot find calling cpu ID");
+       sprintf(pathname,
+               "/sys/devices/system/cpu/cpu%d/topology/thread_siblings",
+               base_cpu);
+
+       filep = fopen_or_die(pathname, "r");
        topo.max_cpu_num = 0;
-       filep = fopen_or_die(
-                       "/sys/devices/system/cpu/cpu0/topology/thread_siblings",
-                       "r");
        while (fscanf(filep, "%lx,", &dummy) == 1)
                topo.max_cpu_num += BITMASK_SIZE;
        fclose(filep);