tools/power turbostat: fix segfault on 'no node' machines

Running turbostat on machines that don't expose nodes
in sysfs (no /sys/bus/node) causes a segfault or a -nan
value diesplayed in the log. This is caused by
physical_node_id being reported as -1 and logical_node_id
being calculated as a negative number resulting in the new
GET_THREAD/GET_CORE returning an incorrect address.

Signed-off-by: Nathan Ciobanu <nathan.d.ciobanu@linux.intel.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 3bc2c9d94739267ac33a9ccb9c731c008e6c1850..97cc00a9c7631058bddde80d8ce8f178702eb5f3 100644 (file)
--- a/tools/power/x86/turbostat/turbostat.c
+++ b/tools/power/x86/turbostat/turbostat.c
@@ -2492,6 +2492,12 @@ void set_node_data(void)
                if (pni[pkg].count > topo.nodes_per_pkg)
                        topo.nodes_per_pkg = pni[0].count;
 
+       /* Fake 1 node per pkg for machines that don't
+        * expose nodes and thus avoid -nan results
+        */
+       if (topo.nodes_per_pkg == 0)
+               topo.nodes_per_pkg = 1;
+
        for (cpu = 0; cpu < topo.num_cpus; cpu++) {
                pkg = cpus[cpu].physical_package_id;
                node = cpus[cpu].physical_node_id;
@@ -4904,6 +4910,13 @@ void init_counter(struct thread_data *thread_base, struct core_data *core_base,
        struct core_data *c;
        struct pkg_data *p;
 
+
+       /* Workaround for systems where physical_node_id==-1
+        * and logical_node_id==(-1 - topo.num_cpus)
+        */
+       if (node_id < 0)
+               node_id = 0;
+
        t = GET_THREAD(thread_base, thread_id, core_id, node_id, pkg_id);
        c = GET_CORE(core_base, core_id, node_id, pkg_id);
        p = GET_PKG(pkg_base, pkg_id);