Signed-off-by: Jan Kiszka <jan.kis...@siemens.com>
---
external-module-compat-comm.h | 4 +++
external-module-compat.c | 59 +++++++++++++++++++++++++++++++++++++++++
2 files changed, 63 insertions(+), 0 deletions(-)
diff --git a/external-module-compat-comm.h b/external-module-compat-comm.h
index de8ab23..8f56f11 100644
--- a/external-module-compat-comm.h
+++ b/external-module-compat-comm.h
@@ -1000,3 +1000,7 @@ static inline unsigned int cpufreq_get(unsigned int cpu)
return 0;
}
#endif
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,28)
+int schedule_hrtimeout(ktime_t *expires, const enum hrtimer_mode mode);
+#endif
diff --git a/external-module-compat.c b/external-module-compat.c
index 6b69127..327fa6b 100644
--- a/external-module-compat.c
+++ b/external-module-compat.c
@@ -409,3 +409,62 @@ unsigned kvm_get_tsc_khz(void)
}
#endif
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,28)
+
+static enum hrtimer_restart kvm_hrtimer_wakeup(struct hrtimer *timer)
+{
+ struct hrtimer_sleeper *t =
+ container_of(timer, struct hrtimer_sleeper, timer);
+ struct task_struct *task = t->task;
+
+ t->task = NULL;
+ if (task)
+ wake_up_process(task);
+
+ return HRTIMER_NORESTART;
+}
+
+int schedule_hrtimeout(ktime_t *expires, const enum hrtimer_mode mode)
+{
+ struct hrtimer_sleeper t;
+
+ /*
+ * Optimize when a zero timeout value is given. It does not
+ * matter whether this is an absolute or a relative time.
+ */
+ if (expires && !expires->tv64) {
+ __set_current_state(TASK_RUNNING);
+ return 0;
+ }
+
+ /*
+ * A NULL parameter means "inifinte"
+ */
+ if (!expires) {
+ schedule();
+ __set_current_state(TASK_RUNNING);
+ return -EINTR;
+ }
+
+ hrtimer_init(&t.timer, CLOCK_MONOTONIC, mode);
+ t.timer.expires = *expires;
+
+ t.timer.function = kvm_hrtimer_wakeup;
+ t.task = current;
+
+ hrtimer_start(&t.timer, t.timer.expires, mode);
+ if (!hrtimer_active(&t.timer))
+ t.task = NULL;
+
+ if (likely(t.task))
+ schedule();
+
+ hrtimer_cancel(&t.timer);
+
+ __set_current_state(TASK_RUNNING);
+
+ return !t.task ? 0 : -EINTR;
+}
+
+#endif
--
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