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[PATCH] PR15789/gettimeofday: do not bail out if cpufreq_register_notifier fails
- From: Timo Juhani Lindfors <timo dot lindfors at iki dot fi>
- To: systemtap at sourceware dot org
- Cc: Timo Juhani Lindfors <timo dot lindfors at iki dot fi>
- Date: Tue, 30 Jul 2013 11:10:39 +0300
- Subject: [PATCH] PR15789/gettimeofday: do not bail out if cpufreq_register_notifier fails
Linux commit d5aaffa9dd531c978c6f3fea06a2972653bd7fc8 (cpufreq: handle
cpufreq being disabled for all exported function.) causes
cpufreq_register_notifier to fail if cpufreq gets disabled at
runtime. This patch simply ignores the failure of
cpufreq_register_notifier so that gettimeofday can continue to work.
Once cpufreq is disabled it can not be enabled at runtime so this
should be safe.
---
runtime/time.c | 6 ++----
1 files changed, 2 insertions(+), 4 deletions(-)
diff --git a/runtime/time.c b/runtime/time.c
index 34df72a..a01d922 100644
--- a/runtime/time.c
+++ b/runtime/time.c
@@ -253,10 +253,8 @@ _stp_init_time(void)
#ifdef CONFIG_CPU_FREQ
if (!ret && !__stp_constant_freq()) {
- ret = cpufreq_register_notifier(&__stp_time_notifier,
- CPUFREQ_TRANSITION_NOTIFIER);
-
- if (!ret) {
+ if (!cpufreq_register_notifier(&__stp_time_notifier,
+ CPUFREQ_TRANSITION_NOTIFIER)) {
for_each_online_cpu(cpu) {
unsigned long flags;
int freq_khz = cpufreq_get(cpu);
--
1.7.2.5