If no CPU list is passed, timerlat in user-space will dispatch
one thread per sysconf(_SC_NPROCESSORS_CONF). However, not all
CPU might be available, for instance, if HT is disabled.

Currently, rtla timerlat is stopping the session if an user-space
thread cannot set affinity to a CPU, or if a running user-space
thread is killed. However, this is too restrictive.

So, reduce the error to a debug message, and rtla timerlat run as
long as there is at least one user-space thread alive.

Fixes: cdca4f4e5e8e ("rtla/timerlat_top: Add timerlat user-space support")
Signed-off-by: Daniel Bristot de Oliveira <bris...@kernel.org>
---
 tools/tracing/rtla/src/timerlat_u.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/tools/tracing/rtla/src/timerlat_u.c 
b/tools/tracing/rtla/src/timerlat_u.c
index 05e310696dd5..01dbf9a6b5a5 100644
--- a/tools/tracing/rtla/src/timerlat_u.c
+++ b/tools/tracing/rtla/src/timerlat_u.c
@@ -45,7 +45,7 @@ static int timerlat_u_main(int cpu, struct timerlat_u_params 
*params)
 
        retval = sched_setaffinity(gettid(), sizeof(set), &set);
        if (retval == -1) {
-               err_msg("Error setting user thread affinity\n");
+               debug_msg("Error setting user thread affinity %d, is the CPU 
online?\n", cpu);
                exit(1);
        }
 
@@ -193,7 +193,9 @@ void *timerlat_u_dispatcher(void *data)
                                        procs_count--;
                                }
                        }
-                       break;
+
+                       if (!procs_count)
+                               break;
                }
 
                sleep(1);
-- 
2.38.1

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