The patch titled
NTP: move the cmos update code into ntp.c
has been removed from the -mm tree. Its filename was
ntp-move-the-cmos-update-code-into-ntpc.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: NTP: move the cmos update code into ntp.c
From: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
i386 and sparc64 have the identical code to update the cmos clock. Move it
into kernel/time/ntp.c as there are other architectures coming along with the
same requirements.
[akpm@xxxxxxxxxxxxxxxxxxxx: build fixes]
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Chris Wright <chrisw@xxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: john stultz <johnstul@xxxxxxxxxx>
Cc: David Miller <davem@xxxxxxxxxxxxx>
Cc: Roman Zippel <zippel@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/i386/Kconfig | 4 ++
arch/i386/kernel/time.c | 50 +----------------------------
arch/sparc64/Kconfig | 4 ++
arch/sparc64/kernel/time.c | 53 +------------------------------
include/asm-i386/timer.h | 1
include/linux/time.h | 3 +
kernel/time/ntp.c | 59 +++++++++++++++++++++++++++++++++--
7 files changed, 71 insertions(+), 103 deletions(-)
diff -puN arch/i386/Kconfig~ntp-move-the-cmos-update-code-into-ntpc arch/i386/Kconfig
--- a/arch/i386/Kconfig~ntp-move-the-cmos-update-code-into-ntpc
+++ a/arch/i386/Kconfig
@@ -18,6 +18,10 @@ config GENERIC_TIME
bool
default y
+config GENERIC_CMOS_UPDATE
+ bool
+ default y
+
config CLOCKSOURCE_WATCHDOG
bool
default y
diff -puN arch/i386/kernel/time.c~ntp-move-the-cmos-update-code-into-ntpc arch/i386/kernel/time.c
--- a/arch/i386/kernel/time.c~ntp-move-the-cmos-update-code-into-ntpc
+++ a/arch/i386/kernel/time.c
@@ -207,55 +207,9 @@ unsigned long read_persistent_clock(void
return retval;
}
-static void sync_cmos_clock(unsigned long dummy);
-
-static DEFINE_TIMER(sync_cmos_timer, sync_cmos_clock, 0, 0);
-int no_sync_cmos_clock;
-
-static void sync_cmos_clock(unsigned long dummy)
-{
- struct timeval now, next;
- int fail = 1;
-
- /*
- * If we have an externally synchronized Linux clock, then update
- * CMOS clock accordingly every ~11 minutes. Set_rtc_mmss() has to be
- * called as close as possible to 500 ms before the new second starts.
- * This code is run on a timer. If the clock is set, that timer
- * may not expire at the correct time. Thus, we adjust...
- */
- if (!ntp_synced())
- /*
- * Not synced, exit, do not restart a timer (if one is
- * running, let it run out).
- */
- return;
-
- do_gettimeofday(&now);
- if (now.tv_usec >= USEC_AFTER - ((unsigned) TICK_SIZE) / 2 &&
- now.tv_usec <= USEC_BEFORE + ((unsigned) TICK_SIZE) / 2)
- fail = set_rtc_mmss(now.tv_sec);
-
- next.tv_usec = USEC_AFTER - now.tv_usec;
- if (next.tv_usec <= 0)
- next.tv_usec += USEC_PER_SEC;
-
- if (!fail)
- next.tv_sec = 659;
- else
- next.tv_sec = 0;
-
- if (next.tv_usec >= USEC_PER_SEC) {
- next.tv_sec++;
- next.tv_usec -= USEC_PER_SEC;
- }
- mod_timer(&sync_cmos_timer, jiffies + timeval_to_jiffies(&next));
-}
-
-void notify_arch_cmos_timer(void)
+int update_persistent_clock(struct timespec now)
{
- if (!no_sync_cmos_clock)
- mod_timer(&sync_cmos_timer, jiffies + 1);
+ return set_rtc_mmss(now.tv_sec);
}
extern void (*late_time_init)(void);
diff -puN arch/sparc64/Kconfig~ntp-move-the-cmos-update-code-into-ntpc arch/sparc64/Kconfig
--- a/arch/sparc64/Kconfig~ntp-move-the-cmos-update-code-into-ntpc
+++ a/arch/sparc64/Kconfig
@@ -23,6 +23,10 @@ config GENERIC_TIME
bool
default y
+config GENERIC_CMOS_UPDATE
+ bool
+ default y
+
config GENERIC_CLOCKEVENTS
bool
default y
diff -puN arch/sparc64/kernel/time.c~ntp-move-the-cmos-update-code-into-ntpc arch/sparc64/kernel/time.c
--- a/arch/sparc64/kernel/time.c~ntp-move-the-cmos-update-code-into-ntpc
+++ a/arch/sparc64/kernel/time.c
@@ -403,58 +403,9 @@ static struct sparc64_tick_ops hbtick_op
static unsigned long timer_ticks_per_nsec_quotient __read_mostly;
-#define TICK_SIZE (tick_nsec / 1000)
-
-#define USEC_AFTER 500000
-#define USEC_BEFORE 500000
-
-static void sync_cmos_clock(unsigned long dummy);
-
-static DEFINE_TIMER(sync_cmos_timer, sync_cmos_clock, 0, 0);
-
-static void sync_cmos_clock(unsigned long dummy)
-{
- struct timeval now, next;
- int fail = 1;
-
- /*
- * If we have an externally synchronized Linux clock, then update
- * CMOS clock accordingly every ~11 minutes. Set_rtc_mmss() has to be
- * called as close as possible to 500 ms before the new second starts.
- * This code is run on a timer. If the clock is set, that timer
- * may not expire at the correct time. Thus, we adjust...
- */
- if (!ntp_synced())
- /*
- * Not synced, exit, do not restart a timer (if one is
- * running, let it run out).
- */
- return;
-
- do_gettimeofday(&now);
- if (now.tv_usec >= USEC_AFTER - ((unsigned) TICK_SIZE) / 2 &&
- now.tv_usec <= USEC_BEFORE + ((unsigned) TICK_SIZE) / 2)
- fail = set_rtc_mmss(now.tv_sec);
-
- next.tv_usec = USEC_AFTER - now.tv_usec;
- if (next.tv_usec <= 0)
- next.tv_usec += USEC_PER_SEC;
-
- if (!fail)
- next.tv_sec = 659;
- else
- next.tv_sec = 0;
-
- if (next.tv_usec >= USEC_PER_SEC) {
- next.tv_sec++;
- next.tv_usec -= USEC_PER_SEC;
- }
- mod_timer(&sync_cmos_timer, jiffies + timeval_to_jiffies(&next));
-}
-
-void notify_arch_cmos_timer(void)
+int update_persistent_clock(struct timespec now)
{
- mod_timer(&sync_cmos_timer, jiffies + 1);
+ return set_rtc_mmss(now.tv_sec);
}
/* Kick start a stopped clock (procedure from the Sun NVRAM/hostid FAQ). */
diff -puN include/asm-i386/timer.h~ntp-move-the-cmos-update-code-into-ntpc include/asm-i386/timer.h
--- a/include/asm-i386/timer.h~ntp-move-the-cmos-update-code-into-ntpc
+++ a/include/asm-i386/timer.h
@@ -11,7 +11,6 @@ unsigned long native_calculate_cpu_khz(v
extern int timer_ack;
extern int no_timer_check;
-extern int no_sync_cmos_clock;
extern int recalibrate_cpu_khz(void);
#ifndef CONFIG_PARAVIRT
diff -puN include/linux/time.h~ntp-move-the-cmos-update-code-into-ntpc include/linux/time.h
--- a/include/linux/time.h~ntp-move-the-cmos-update-code-into-ntpc
+++ a/include/linux/time.h
@@ -4,6 +4,7 @@
#include <linux/types.h>
#ifdef __KERNEL__
+# include <linux/cache.h>
# include <linux/seqlock.h>
#endif
@@ -94,6 +95,8 @@ extern struct timespec wall_to_monotonic
extern seqlock_t xtime_lock __attribute__((weak));
extern unsigned long read_persistent_clock(void);
+extern int update_persistent_clock(struct timespec now);
+extern int no_sync_cmos_clock __read_mostly;
void timekeeping_init(void);
static inline unsigned long get_seconds(void)
diff -puN kernel/time/ntp.c~ntp-move-the-cmos-update-code-into-ntpc kernel/time/ntp.c
--- a/kernel/time/ntp.c~ntp-move-the-cmos-update-code-into-ntpc
+++ a/kernel/time/ntp.c
@@ -10,6 +10,7 @@
#include <linux/mm.h>
#include <linux/time.h>
+#include <linux/timer.h>
#include <linux/timex.h>
#include <linux/jiffies.h>
#include <linux/hrtimer.h>
@@ -175,12 +176,64 @@ u64 current_tick_length(void)
return tick_length;
}
+#ifdef CONFIG_GENERIC_CMOS_UPDATE
-void __attribute__ ((weak)) notify_arch_cmos_timer(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 DEFINE_TIMER(sync_cmos_timer, sync_cmos_clock, 0, 0);
+
+static void sync_cmos_clock(unsigned long dummy)
{
- return;
+ struct timespec now, next;
+ int fail = 1;
+
+ /*
+ * If we have an externally synchronized Linux clock, then update
+ * CMOS clock accordingly every ~11 minutes. Set_rtc_mmss() has to be
+ * called as close as possible to 500 ms before the new second starts.
+ * This code is run on a timer. If the clock is set, that timer
+ * may not expire at the correct time. Thus, we adjust...
+ */
+ if (!ntp_synced())
+ /*
+ * Not synced, exit, do not restart a timer (if one is
+ * running, let it run out).
+ */
+ return;
+
+ getnstimeofday(&now);
+ if (abs(xtime.tv_nsec - (NSEC_PER_SEC / 2)) <= tick_nsec / 2)
+ fail = update_persistent_clock(now);
+
+ next.tv_nsec = (NSEC_PER_SEC / 2) - now.tv_nsec;
+ if (next.tv_nsec <= 0)
+ next.tv_nsec += NSEC_PER_SEC;
+
+ if (!fail)
+ next.tv_sec = 659;
+ else
+ next.tv_sec = 0;
+
+ if (next.tv_nsec >= NSEC_PER_SEC) {
+ next.tv_sec++;
+ next.tv_nsec -= NSEC_PER_SEC;
+ }
+ mod_timer(&sync_cmos_timer, jiffies + timespec_to_jiffies(&next));
}
+static void notify_cmos_timer(void)
+{
+ if (no_sync_cmos_clock)
+ mod_timer(&sync_cmos_timer, jiffies + 1);
+}
+
+#else
+static inline void notify_cmos_timer(void) { }
+#endif
+
/* adjtimex mainly allows reading (and writing, if superuser) of
* kernel time-keeping variables. used by xntpd.
*/
@@ -345,6 +398,6 @@ leave: if ((time_status & (STA_UNSYNC|ST
txc->stbcnt = 0;
write_sequnlock_irq(&xtime_lock);
do_gettimeofday(&txc->time);
- notify_arch_cmos_timer();
+ notify_cmos_timer();
return(result);
}
_
Patches currently in -mm which might be from tglx@xxxxxxxxxxxxx are
git-acpi.patch
acpi-move-timer-broadcast-and-pmtimer-access-before-c3-arbiter-shutdown.patch
nohz-fix-nohz-x86-dyntick-idle-handling.patch
acpi-remove-the-useless-ifdef-code.patch
x86_64-hpet-restore-vread.patch
x86_64-restore-restore-nohpet-cmdline.patch
x86_64-block-irq-balancing-for-timer.patch
x86_64-prep-idle-loop-for-dynticks.patch
x86_64-enable-high-resolution-timers-and-dynticks.patch
x86_64-dynticks-disable-hpet_id_legsup-hpets.patch
geode-mfgpt-clock-event-device-support.patch
whitespace-fixes-time-syscalls.patch
whitespace-fixes-interval-timers.patch
whitespace-fixes-system-timers.patch
-
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