[PATCH v3] rt-numa: ignore runtime cpumask if -a CPULIST is specified

[Marcelo Tosatti <mtosatti@redhat.com>]

When using isolcpus kernel command line option, the CPUs
specified at isolcpus= are not part of the run time environment
cpumask.

This causes "cyclictest -a isolatedcpus" to fail with:

WARN: Couldn't setaffinity in main thread: Invalid argument
FATAL: No allowable cpus to run on
# /dev/cpu_dma_latency set to 0us

To fix this, ignore the runtime cpumask if neither "+", "!"
are specified in the cpu list string.

Suggested by Sebastian Andrzej Siewior.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

v3: simplified version (John Kacur)
v2: fix changelog typo

diff --git a/src/lib/rt-numa.c b/src/lib/rt-numa.c
index ee5ab99..3eead80 100644
--- a/src/lib/rt-numa.c
+++ b/src/lib/rt-numa.c
@@ -131,7 +131,8 @@ int parse_cpumask(char *str, int max_cpus, struct bitmask **cpumask)
 		return 0;
 	}
 
-	use_current_cpuset(max_cpus, mask);
+	if (strchr(str, '!') != NULL || strchr(str, '+') != NULL)
+		use_current_cpuset(max_cpus, mask);
 	*cpumask = mask;
 
 	return 0;