The patch titled
timers: add usleep[_range] timer
has been added to the -mm tree. Its filename is
timers-add-usleep-timer.patch
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find
out what to do about this
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: timers: add usleep[_range] timer
From: Patrick Pannuto <ppannuto@xxxxxxxxxxxxxx>
usleep[_range] are finer precision implementations of msleep and are
designed to be drop-in replacements for udelay where a precise sleep /
busy-wait is unnecessary. They also allow an easy interface to specify
slack when a precise (ish) wakeup is unnecessary to help minimize wakeups
Signed-off-by: Patrick Pannuto <ppannuto@xxxxxxxxxxxxxx>
Acked-by: Arjan van de Ven <arjan@xxxxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/delay.h | 6 ++++++
kernel/timer.c | 22 ++++++++++++++++++++++
2 files changed, 28 insertions(+)
diff -puN include/linux/delay.h~timers-add-usleep-timer include/linux/delay.h
--- a/include/linux/delay.h~timers-add-usleep-timer
+++ a/include/linux/delay.h
@@ -45,6 +45,12 @@ extern unsigned long lpj_fine;
void calibrate_delay(void);
void msleep(unsigned int msecs);
unsigned long msleep_interruptible(unsigned int msecs);
+void usleep_range(unsigned long min, unsigned long max);
+
+static inline void usleep(unsigned long usecs)
+{
+ usleep_range(usecs, usecs);
+}
static inline void ssleep(unsigned int seconds)
{
diff -puN kernel/timer.c~timers-add-usleep-timer kernel/timer.c
--- a/kernel/timer.c~timers-add-usleep-timer
+++ a/kernel/timer.c
@@ -1763,3 +1763,25 @@ unsigned long msleep_interruptible(unsig
}
EXPORT_SYMBOL(msleep_interruptible);
+
+static int __sched do_usleep_range(unsigned long min, unsigned long max)
+{
+ ktime_t kmin;
+ unsigned long delta;
+
+ kmin = ktime_set(0, min * NSEC_PER_USEC);
+ delta = max - min;
+ return schedule_hrtimeout_range(&kmin, delta, HRTIMER_MODE_REL);
+}
+
+/**
+ * usleep_range - Drop in replacement for udelay where wakeup is flexible
+ * @min: Minimum time in usecs to sleep
+ * @max: Maximum time in usecs to sleep
+ */
+void usleep_range(unsigned long min, unsigned long max)
+{
+ __set_current_state(TASK_UNINTERRUPTIBLE);
+ do_usleep_range(min, max);
+}
+EXPORT_SYMBOL(usleep_range);
_
Patches currently in -mm which might be from ppannuto@xxxxxxxxxxxxxx are
timers-add-usleep-timer.patch
--
To unsubscribe from this list: send the line "unsubscribe mm-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
