From: Anton Vorontsov <an...@enomsg.org>
This patch introduces timerfd_rearm(), this small helper is used to
forward and restart the hrtimer.
Signed-off-by: Anton Vorontsov <anton.voront...@linaro.org>
Signed-off-by: Alexey Perevalov <a.pereva...@samsung.com>
---
fs/timerfd.c | 40 +++++++++++++++++++---------------------
1 file changed, 19 insertions(+), 21 deletions(-)
diff --git a/fs/timerfd.c b/fs/timerfd.c
index 9293121..4a349cb 100644
--- a/fs/timerfd.c
+++ b/fs/timerfd.c
@@ -229,6 +229,23 @@ static unsigned int timerfd_poll(struct file *file,
poll_table *wait)
return events;
}
+static u64 timerfd_rearm(struct timerfd_ctx *ctx)
+{
+ u64 orun = 0;
+
+ if (isalarm(ctx)) {
+ orun += alarm_forward_now(
+ &ctx->t.alarm, ctx->tintv) - 1;
+ alarm_restart(&ctx->t.alarm);
+ } else {
+ orun += hrtimer_forward_now(&ctx->t.tmr,
+ ctx->tintv) - 1;
+ hrtimer_restart(&ctx->t.tmr);
+ }
+
+ return orun;
+}
+
static ssize_t timerfd_read(struct file *file, char __user *buf, size_t count,
loff_t *ppos)
{
@@ -265,15 +282,7 @@ static ssize_t timerfd_read(struct file *file, char __user
*buf, size_t count,
* callback to avoid DoS attacks specifying a very
* short timer period.
*/
- if (isalarm(ctx)) {
- ticks += alarm_forward_now(
- &ctx->t.alarm, ctx->tintv) - 1;
- alarm_restart(&ctx->t.alarm);
- } else {
- ticks += hrtimer_forward_now(&ctx->t.tmr,
- ctx->tintv) - 1;
- hrtimer_restart(&ctx->t.tmr);
- }
+ ticks += timerfd_rearm(ctx);
}
ctx->expired = 0;
ctx->ticks = 0;
@@ -421,18 +430,7 @@ static int do_timerfd_gettime(int ufd, struct itimerspec
*t)
spin_lock_irq(&ctx->wqh.lock);
if (ctx->expired && ctx->tintv.tv64) {
ctx->expired = 0;
-
- if (isalarm(ctx)) {
- ctx->ticks +=
- alarm_forward_now(
- &ctx->t.alarm, ctx->tintv) - 1;
- alarm_restart(&ctx->t.alarm);
- } else {
- ctx->ticks +=
- hrtimer_forward_now(&ctx->t.tmr, ctx->tintv)
- - 1;
- hrtimer_restart(&ctx->t.tmr);
- }
+ ctx->ticks += timerfd_rearm(ctx);
}
t->it_value = ktime_to_timespec(timerfd_get_remaining(ctx));
t->it_interval = ktime_to_timespec(ctx->tintv);
--
1.7.9.5
--
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