cmdline: --priority/-p requires a thread list

Next csets will try to transform an irq_list into a thread list if running on a
threaded interrupts kernel, so that 'tuna -q list -p fifo:90', for instance,
works.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/tuna-cmd.py b/tuna-cmd.py
index 21ee97a..cf1f3fb 100755
--- a/tuna-cmd.py
+++ b/tuna-cmd.py
@@ -469,6 +469,9 @@ def main():
 				sys.exit(2)
 			tuna.include_cpus(cpu_list, get_nr_cpus())
 		elif o in ("-p", "--priority"):
+			if not thread_list:
+				print "tuna: --what_is " + _("requires a thread list!")
+				sys.exit(2)
 			tuna.threads_set_priority(thread_list, a, affect_children)
 		elif o in ("-P", "--show_threads"):
 			# If the user specified process names that weren't