[libvirt] [PATCH] Fix scheduler support check

Commit 94cc577807ba tried fixing build on systems that did not have SCHED_BATCH or SCHED_IDLE defined. But instead of changing it to conditional support, it rather completely disabled the support for setting any scheduler. Since then, such old systems are not supported, but rather than reverting that commit, let's change that to the conditional support. That way any addition to the list of schedulers can follow the same style so that we're consistent in the future. Signed-off-by: Martin Kletzander <mkletzan(a)redhat.com&gt; --- Notes: Of course there are various ways how to address that, I went with case. Also defining undefined SCHED_* to -1 makes some gnulib syntax-check go haywire. src/util/virprocess.c | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-) diff --git a/src/util/virprocess.c b/src/util/virprocess.c index 718c4a2664e1..39d6b30c40f2 100644 --- a/src/util/virprocess.c +++ b/src/util/virprocess.c @@ -1183,7 +1183,7 @@ virProcessExitWithStatus(int status) exit(value); } -#if HAVE_SCHED_SETSCHEDULER && defined(SCHED_BATCH) && defined(SCHED_IDLE) +#if HAVE_SCHED_SETSCHEDULER static int virProcessSchedTranslatePolicy(virProcessSchedPolicy policy) @@ -1196,10 +1196,18 @@ virProcessSchedTranslatePolicy(virProcessSchedPolicy policy) return SCHED_BATCH; case VIR_PROC_POLICY_IDLE: +# ifdef SCHED_IDLE return SCHED_IDLE; +# else + return -1; +# endif case VIR_PROC_POLICY_FIFO: +# ifdef SCHED_FIFO return SCHED_FIFO; +# else + return -1; +# endif case VIR_PROC_POLICY_RR: return SCHED_RR; @@ -1225,6 +1233,13 @@ virProcessSetScheduler(pid_t pid, if (!policy) return 0; + if (pol < 0) { + virReportError(VIR_ERR_CONFIG_UNSUPPORTED, + _("Scheduler '%s' is not supported on this platform"), + virProcessSchedPolicyTypeToString(policy)); + return -1; + } + if (pol == SCHED_FIFO || pol == SCHED_RR) { int min = 0; int max = 0; -- 2.10.2