Commit b6a2828e introduced new functions to set process scheduler. There is a small typo in ELSE path for systems where scheduler is not available. Also some of the definitions were introduced later in kernel. For example RHEL-5 is running on kernel 2.6.18, but SCHED_IDLE was introduces in 2.6.23 [1] and SCHED_BATCH in 2.6.16 [1]. We should not count only on existence of function sched_setscheduler(), we must also check for existence of used macros as they might not be defined. [1] see 'man 7 sched' Signed-off-by: Pavel Hrdina <phrdina(a)redhat.com&gt; --- src/util/virprocess.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/src/util/virprocess.c b/src/util/virprocess.c index b3e5435..342bf40 100644 --- a/src/util/virprocess.c +++ b/src/util/virprocess.c @@ -1062,7 +1062,7 @@ virProcessExitWithStatus(int status) exit(value); } -#if HAVE_SCHED_SETSCHEDULER +#if HAVE_SCHED_SETSCHEDULER && defined(SCHED_BATCH) && defined(SCHED_IDLE) static int virProcessSchedTranslatePolicy(virProcessSchedPolicy policy) @@ -1092,7 +1092,9 @@ virProcessSchedTranslatePolicy(virProcessSchedPolicy policy) } int -virProcessSetScheduler(pid_t pid, virProcessSchedPolicy policy, int priority) +virProcessSetScheduler(pid_t pid, + virProcessSchedPolicy policy, + int priority) { struct sched_param param = {0}; int pol = virProcessSchedTranslatePolicy(policy); @@ -1144,7 +1146,7 @@ virProcessSetScheduler(pid_t pid, virProcessSchedPolicy policy, int priority) int virProcessSetScheduler(pid_t pid ATTRIBUTE_UNUSED, - int policy, + virProcessSchedPolicy policy, int priority ATTRIBUTE_UNUSED) { if (!policy) -- 2.0.5