[PATCH] rteval: Avoid passing None cpulist to measurement

[tglozar@redhat.com]

From: Tomas Glozar <tglozar@redhat.com>

When rteval is called via the command line, cpulists for both
measurements and loads default to an empty string and are further
processed by parse_cpulist_from_config. However, this is not true when
rteval is used as a module: in that case, neither the default
command-line value is used nor parse_cpulist_from_config is run, leading
to None being set to the config property of measurements which is
explicitely passed down to the corresponding cyclictest config property.

The issue was introduced in 64ce7848dfab ("rteval: Add relative cpulists
for measurements"), where the check for None was removed from
the cyclictest module, assuming the value was processed by
parse_cpulist_from_config.

Avoid this by calling parse_cpulist_from_config with an empty string to
get the default cpulist to pass to cyclictest module if cpulist is empty
in the measurement config.

Note: this is a workaround, in the future, parse_cpulist_from_config
will be called properly in one place only instead of being scattered
throughout the code of rteval. That will also enable relative cpulists
to be used when calling rteval as a module.

Fixes: 64ce7848dfab ("rteval: Add relative cpulists for measurements")
Signed-off-by: Tomas Glozar <tglozar@redhat.com>
---
 rteval/modules/measurement/__init__.py | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/rteval/modules/measurement/__init__.py b/rteval/modules/measurement/__init__.py
index 11bd7b0..fda618d 100644
--- a/rteval/modules/measurement/__init__.py
+++ b/rteval/modules/measurement/__init__.py
@@ -148,6 +148,13 @@ measurement profiles, based on their characteristics"""
         modcfg = self.__cfg.GetSection("measurement")
         cpulist = modcfg.cpulist
         run_on_isolcpus = modcfg.run_on_isolcpus
+        if cpulist is None:
+            # Avoid passing None cpulist down to measurement module which might
+            # not expect it
+            # Note: None can appear only when using rteval as module, not when
+            # being called from command line; in the latter, cpulists are all
+            # processed by parse_cpulist_from_config already by this point
+            cpulist = cpulist_utils.collapse_cpulist(parse_cpulist_from_config("", run_on_isolcpus))
 
         for (modname, modtype) in modcfg:
             if isinstance(modtype, str) and modtype.lower() == 'module':  # Only 'module' will be supported (ds)
-- 
2.45.0