The patch titled
ntp: let update_persistent_clock() sleep
has been added to the -mm tree. Its filename is
ntp-let-update_persistent_clock-sleep.patch
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------------------------------------------------------
Subject: ntp: let update_persistent_clock() sleep
From: "Maciej W. Rozycki" <macro@xxxxxxxxxxxxxx>
This is a change that makes the 11-minute RTC update be run in the process
context. This is so that update_persistent_clock() can sleep, which may
be required for certain types of RTC hardware -- most notably I2C devices.
Signed-off-by: Maciej W. Rozycki <macro@xxxxxxxxxxxxxx>
Acked-by: Rik van Riel <riel@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Roman Zippel <zippel@xxxxxxxxxxxxxx>
Cc: Alessandro Zummo <a.zummo@xxxxxxxxxxxx>
Cc: David Brownell <david-b@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/time/ntp.c | 15 +++++++++++++--
1 file changed, 13 insertions(+), 2 deletions(-)
diff -puN kernel/time/ntp.c~ntp-let-update_persistent_clock-sleep kernel/time/ntp.c
--- a/kernel/time/ntp.c~ntp-let-update_persistent_clock-sleep
+++ a/kernel/time/ntp.c
@@ -3,6 +3,8 @@
*
* NTP state machine interfaces and logic.
*
+ * Copyright (c) 2008 Maciej W. Rozycki
+ *
* This code was mainly moved from kernel/timer.c and kernel/time.c
* Please see those files for relevant copyright info and historical
* changelogs.
@@ -17,6 +19,7 @@
#include <linux/capability.h>
#include <linux/math64.h>
#include <linux/clocksource.h>
+#include <linux/workqueue.h>
#include <asm/timex.h>
/*
@@ -218,11 +221,13 @@ void second_overflow(void)
/* Disable the cmos update - used by virtualization and embedded */
int no_sync_cmos_clock __read_mostly;
-static void sync_cmos_clock(unsigned long dummy);
+static void sync_cmos_clock(unsigned long data);
+static void do_sync_cmos_clock(struct work_struct *work);
static DEFINE_TIMER(sync_cmos_timer, sync_cmos_clock, 0, 0);
+static DECLARE_WORK(sync_cmos_work, do_sync_cmos_clock);
-static void sync_cmos_clock(unsigned long dummy)
+static void do_sync_cmos_clock(struct work_struct *work)
{
struct timespec now, next;
int fail = 1;
@@ -261,6 +266,12 @@ static void sync_cmos_clock(unsigned lon
mod_timer(&sync_cmos_timer, jiffies + timespec_to_jiffies(&next));
}
+static void sync_cmos_clock(unsigned long data)
+{
+ /* Some implementations of update_persistent_clock() may sleep. */
+ schedule_work(&sync_cmos_work);
+}
+
static void notify_cmos_timer(void)
{
if (!no_sync_cmos_clock)
_
Patches currently in -mm which might be from macro@xxxxxxxxxxxxxx are
linux-next.patch
ntp-let-update_persistent_clock-sleep.patch
ntp-make-the-rtc-sync-mode-11-minute-again.patch
ntp-fix-calculation-of-the-next-jiffie-to-trigger-rtc-sync.patch
rtc-m41t80-sort-header-inclusions-for-readability.patch
rtc-m41t80-use-pr_info-as-appropriate.patch
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