From: Reinette Chatre <reinette.cha...@intel.com>

The resctrl tests can accept a CPU on which the tests are run and use
default of CPU #1 if it is not provided. In the CAT test a "sibling CPU"
is determined that is from the same package where another thread will be
run.

The current algorithm with which a "sibling CPU" is determined does not
take the provided/default CPU into account and when that CPU is the
first CPU in a package then the "sibling CPU" will be selected to be the
same CPU since it starts by picking the first CPU from core_siblings_list.

Fix the "sibling CPU" selection by taking the provided/default CPU into
account and ensuring a sibling that is a different CPU is selected.

Signed-off-by: Reinette Chatre <reinette.cha...@intel.com>
Signed-off-by: Fenghua Yu <fenghua...@intel.com>
---
Change Log:
v5:
- Move from v4's patch 8 to this patch as the fix patch should be first
  (Shuah).

 tools/testing/selftests/resctrl/resctrlfs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/resctrl/resctrlfs.c 
b/tools/testing/selftests/resctrl/resctrlfs.c
index 4174e48e06d1..bc52076bee7f 100644
--- a/tools/testing/selftests/resctrl/resctrlfs.c
+++ b/tools/testing/selftests/resctrl/resctrlfs.c
@@ -268,7 +268,7 @@ int get_core_sibling(int cpu_no)
        while (token) {
                sibling_cpu_no = atoi(token);
                /* Skipping core 0 as we don't want to run test on core 0 */
-               if (sibling_cpu_no != 0)
+               if (sibling_cpu_no != 0 && sibling_cpu_no != cpu_no)
                        break;
                token = strtok(NULL, "-,");
        }
-- 
2.30.1

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