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Date: Fri, 12 Oct 2012 13:42:29 +0200 (CEST)
From: Thomas Gleixner <tglx@...utronix.de>
To: Linus Torvalds <torvalds@...ux-foundation.org>
cc: Andrew Morton <akpm@...ux-foundation.org>,
Ingo Molnar <mingo@...nel.org>,
John Stultz <johnstul@...ibm.com>,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: [GIT PULL] timers for 3.7
On Fri, 12 Oct 2012, Thomas Gleixner wrote:
> Linus,
>
> please pull the latest timers-core-for-linus git tree from:
>
> git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git timers-core-for-linus
Forgot to add the short description:
* Bug fixes (one for a long standing dead loop issue)
* Rework of time related vsyscalls
* Timer extensions for workqueues
* Alarm timer updates
* Jiffies updates to remove compile time dependencies
Thanks,
tglx
> ------------------>
> Arnd Bergmann (1):
> time/jiffies: bring back unconditional LATCH definition
>
> Dan Carpenter (1):
> timekeeping: Cast raw_interval to u64 to avoid shift overflow
>
> Hildner, Christian (1):
> timers: Fix endless looping between cascade() and internal_add_timer()
>
> John Stultz (11):
> alarmtimer: Use hrtimer per-alarm instead of per-base
> alarmtimer: Remove unused helpers & defines
> alarmtimer: Rename alarmtimer_remove to alarmtimer_dequeue
> jiffies: Kill unused TICK_USEC_TO_NSEC
> jiffies: Remove compile time assumptions about CLOCK_TICK_RATE
> time: Move timekeeper structure to timekeeper_internal.h for vsyscall changes
> time: Move update_vsyscall definitions to timekeeper_internal.h
> time: Convert CONFIG_GENERIC_TIME_VSYSCALL to CONFIG_GENERIC_TIME_VSYSCALL_OLD
> time: Introduce new GENERIC_TIME_VSYSCALL
> time: Only do nanosecond rounding on GENERIC_TIME_VSYSCALL_OLD systems
> time: Convert x86_64 to using new update_vsyscall
>
> Tejun Heo (4):
> timer: Generalize timer->base flags handling
> timer: Relocate declarations of init_timer_on_stack_key()
> timer: Clean up timer initializers
> timer: Implement TIMER_IRQSAFE
>
> Todd Poynor (1):
> alarmtimer: Implement minimum alarm interval for allowing suspend
>
>
> arch/ia64/Kconfig | 2 +-
> arch/ia64/kernel/time.c | 4 +-
> arch/powerpc/Kconfig | 2 +-
> arch/powerpc/kernel/time.c | 4 +-
> arch/s390/Kconfig | 2 +-
> arch/s390/kernel/time.c | 4 +-
> arch/x86/include/asm/vgtod.h | 4 +-
> arch/x86/kernel/setup.c | 3 +
> arch/x86/kernel/vsyscall_64.c | 49 ++++++----
> arch/x86/vdso/vclock_gettime.c | 22 +++--
> include/linux/alarmtimer.h | 31 +------
> include/linux/clocksource.h | 16 ----
> include/linux/jiffies.h | 20 +----
> include/linux/timekeeper_internal.h | 108 +++++++++++++++++++++++
> include/linux/timer.h | 165 ++++++++++++++---------------------
> kernel/time.c | 2 +-
> kernel/time/Kconfig | 4 +
> kernel/time/alarmtimer.c | 118 +++++++++----------------
> kernel/time/jiffies.c | 32 +++++++-
> kernel/time/timekeeping.c | 117 +++++++------------------
> kernel/timer.c | 118 ++++++++++++-------------
> 21 files changed, 403 insertions(+), 424 deletions(-)
> create mode 100644 include/linux/timekeeper_internal.h
>
> diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
> index 310cf57..f9e673c 100644
> --- a/arch/ia64/Kconfig
> +++ b/arch/ia64/Kconfig
> @@ -38,7 +38,7 @@ config IA64
> select ARCH_TASK_STRUCT_ALLOCATOR
> select ARCH_THREAD_INFO_ALLOCATOR
> select ARCH_CLOCKSOURCE_DATA
> - select GENERIC_TIME_VSYSCALL
> + select GENERIC_TIME_VSYSCALL_OLD
> default y
> help
> The Itanium Processor Family is Intel's 64-bit successor to
> diff --git a/arch/ia64/kernel/time.c b/arch/ia64/kernel/time.c
> index ecc904b..d2f4e26 100644
> --- a/arch/ia64/kernel/time.c
> +++ b/arch/ia64/kernel/time.c
> @@ -19,7 +19,7 @@
> #include <linux/interrupt.h>
> #include <linux/efi.h>
> #include <linux/timex.h>
> -#include <linux/clocksource.h>
> +#include <linux/timekeeper_internal.h>
> #include <linux/platform_device.h>
>
> #include <asm/machvec.h>
> @@ -454,7 +454,7 @@ void update_vsyscall_tz(void)
> {
> }
>
> -void update_vsyscall(struct timespec *wall, struct timespec *wtm,
> +void update_vsyscall_old(struct timespec *wall, struct timespec *wtm,
> struct clocksource *c, u32 mult)
> {
> write_seqcount_begin(&fsyscall_gtod_data.seq);
> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
> index 352f416..0881660 100644
> --- a/arch/powerpc/Kconfig
> +++ b/arch/powerpc/Kconfig
> @@ -135,7 +135,7 @@ config PPC
> select ARCH_HAVE_NMI_SAFE_CMPXCHG
> select GENERIC_SMP_IDLE_THREAD
> select GENERIC_CMOS_UPDATE
> - select GENERIC_TIME_VSYSCALL
> + select GENERIC_TIME_VSYSCALL_OLD
> select GENERIC_CLOCKEVENTS
> select GENERIC_STRNCPY_FROM_USER
> select GENERIC_STRNLEN_USER
> diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c
> index e49e931..c825809 100644
> --- a/arch/powerpc/kernel/time.c
> +++ b/arch/powerpc/kernel/time.c
> @@ -73,7 +73,7 @@
> /* powerpc clocksource/clockevent code */
>
> #include <linux/clockchips.h>
> -#include <linux/clocksource.h>
> +#include <linux/timekeeper_internal.h>
>
> static cycle_t rtc_read(struct clocksource *);
> static struct clocksource clocksource_rtc = {
> @@ -712,7 +712,7 @@ static cycle_t timebase_read(struct clocksource *cs)
> return (cycle_t)get_tb();
> }
>
> -void update_vsyscall(struct timespec *wall_time, struct timespec *wtm,
> +void update_vsyscall_old(struct timespec *wall_time, struct timespec *wtm,
> struct clocksource *clock, u32 mult)
> {
> u64 new_tb_to_xs, new_stamp_xsec;
> diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
> index 107610e..ba488aa 100644
> --- a/arch/s390/Kconfig
> +++ b/arch/s390/Kconfig
> @@ -121,7 +121,7 @@ config S390
> select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
> select ARCH_WANT_IPC_PARSE_VERSION
> select GENERIC_SMP_IDLE_THREAD
> - select GENERIC_TIME_VSYSCALL
> + select GENERIC_TIME_VSYSCALL_OLD
> select GENERIC_CLOCKEVENTS
> select KTIME_SCALAR if 32BIT
> select HAVE_ARCH_SECCOMP_FILTER
> diff --git a/arch/s390/kernel/time.c b/arch/s390/kernel/time.c
> index dcec960..c5430bf 100644
> --- a/arch/s390/kernel/time.c
> +++ b/arch/s390/kernel/time.c
> @@ -34,7 +34,7 @@
> #include <linux/profile.h>
> #include <linux/timex.h>
> #include <linux/notifier.h>
> -#include <linux/clocksource.h>
> +#include <linux/timekeeper_internal.h>
> #include <linux/clockchips.h>
> #include <linux/gfp.h>
> #include <linux/kprobes.h>
> @@ -219,7 +219,7 @@ struct clocksource * __init clocksource_default_clock(void)
> return &clocksource_tod;
> }
>
> -void update_vsyscall(struct timespec *wall_time, struct timespec *wtm,
> +void update_vsyscall_old(struct timespec *wall_time, struct timespec *wtm,
> struct clocksource *clock, u32 mult)
> {
> if (clock != &clocksource_tod)
> diff --git a/arch/x86/include/asm/vgtod.h b/arch/x86/include/asm/vgtod.h
> index 8b38be2..46e24d3 100644
> --- a/arch/x86/include/asm/vgtod.h
> +++ b/arch/x86/include/asm/vgtod.h
> @@ -17,8 +17,8 @@ struct vsyscall_gtod_data {
>
> /* open coded 'struct timespec' */
> time_t wall_time_sec;
> - u32 wall_time_nsec;
> - u32 monotonic_time_nsec;
> + u64 wall_time_snsec;
> + u64 monotonic_time_snsec;
> time_t monotonic_time_sec;
>
> struct timezone sys_tz;
> diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
> index f4b9b80..4062f15 100644
> --- a/arch/x86/kernel/setup.c
> +++ b/arch/x86/kernel/setup.c
> @@ -68,6 +68,7 @@
> #include <linux/percpu.h>
> #include <linux/crash_dump.h>
> #include <linux/tboot.h>
> +#include <linux/jiffies.h>
>
> #include <video/edid.h>
>
> @@ -1034,6 +1035,8 @@ void __init setup_arch(char **cmdline_p)
> mcheck_init();
>
> arch_init_ideal_nops();
> +
> + register_refined_jiffies(CLOCK_TICK_RATE);
> }
>
> #ifdef CONFIG_X86_32
> diff --git a/arch/x86/kernel/vsyscall_64.c b/arch/x86/kernel/vsyscall_64.c
> index 8d141b3..3a3e8c9 100644
> --- a/arch/x86/kernel/vsyscall_64.c
> +++ b/arch/x86/kernel/vsyscall_64.c
> @@ -28,7 +28,7 @@
> #include <linux/jiffies.h>
> #include <linux/sysctl.h>
> #include <linux/topology.h>
> -#include <linux/clocksource.h>
> +#include <linux/timekeeper_internal.h>
> #include <linux/getcpu.h>
> #include <linux/cpu.h>
> #include <linux/smp.h>
> @@ -82,32 +82,41 @@ void update_vsyscall_tz(void)
> vsyscall_gtod_data.sys_tz = sys_tz;
> }
>
> -void update_vsyscall(struct timespec *wall_time, struct timespec *wtm,
> - struct clocksource *clock, u32 mult)
> +void update_vsyscall(struct timekeeper *tk)
> {
> - struct timespec monotonic;
> + struct vsyscall_gtod_data *vdata = &vsyscall_gtod_data;
>
> - write_seqcount_begin(&vsyscall_gtod_data.seq);
> + write_seqcount_begin(&vdata->seq);
>
> /* copy vsyscall data */
> - vsyscall_gtod_data.clock.vclock_mode = clock->archdata.vclock_mode;
> - vsyscall_gtod_data.clock.cycle_last = clock->cycle_last;
> - vsyscall_gtod_data.clock.mask = clock->mask;
> - vsyscall_gtod_data.clock.mult = mult;
> - vsyscall_gtod_data.clock.shift = clock->shift;
> -
> - vsyscall_gtod_data.wall_time_sec = wall_time->tv_sec;
> - vsyscall_gtod_data.wall_time_nsec = wall_time->tv_nsec;
> + vdata->clock.vclock_mode = tk->clock->archdata.vclock_mode;
> + vdata->clock.cycle_last = tk->clock->cycle_last;
> + vdata->clock.mask = tk->clock->mask;
> + vdata->clock.mult = tk->mult;
> + vdata->clock.shift = tk->shift;
> +
> + vdata->wall_time_sec = tk->xtime_sec;
> + vdata->wall_time_snsec = tk->xtime_nsec;
> +
> + vdata->monotonic_time_sec = tk->xtime_sec
> + + tk->wall_to_monotonic.tv_sec;
> + vdata->monotonic_time_snsec = tk->xtime_nsec
> + + (tk->wall_to_monotonic.tv_nsec
> + << tk->shift);
> + while (vdata->monotonic_time_snsec >=
> + (((u64)NSEC_PER_SEC) << tk->shift)) {
> + vdata->monotonic_time_snsec -=
> + ((u64)NSEC_PER_SEC) << tk->shift;
> + vdata->monotonic_time_sec++;
> + }
>
> - monotonic = timespec_add(*wall_time, *wtm);
> - vsyscall_gtod_data.monotonic_time_sec = monotonic.tv_sec;
> - vsyscall_gtod_data.monotonic_time_nsec = monotonic.tv_nsec;
> + vdata->wall_time_coarse.tv_sec = tk->xtime_sec;
> + vdata->wall_time_coarse.tv_nsec = (long)(tk->xtime_nsec >> tk->shift);
>
> - vsyscall_gtod_data.wall_time_coarse = __current_kernel_time();
> - vsyscall_gtod_data.monotonic_time_coarse =
> - timespec_add(vsyscall_gtod_data.wall_time_coarse, *wtm);
> + vdata->monotonic_time_coarse = timespec_add(vdata->wall_time_coarse,
> + tk->wall_to_monotonic);
>
> - write_seqcount_end(&vsyscall_gtod_data.seq);
> + write_seqcount_end(&vdata->seq);
> }
>
> static void warn_bad_vsyscall(const char *level, struct pt_regs *regs,
> diff --git a/arch/x86/vdso/vclock_gettime.c b/arch/x86/vdso/vclock_gettime.c
> index 885eff4..4df6c37 100644
> --- a/arch/x86/vdso/vclock_gettime.c
> +++ b/arch/x86/vdso/vclock_gettime.c
> @@ -80,7 +80,7 @@ notrace static long vdso_fallback_gtod(struct timeval *tv, struct timezone *tz)
> }
>
>
> -notrace static inline long vgetns(void)
> +notrace static inline u64 vgetsns(void)
> {
> long v;
> cycles_t cycles;
> @@ -91,21 +91,24 @@ notrace static inline long vgetns(void)
> else
> return 0;
> v = (cycles - gtod->clock.cycle_last) & gtod->clock.mask;
> - return (v * gtod->clock.mult) >> gtod->clock.shift;
> + return v * gtod->clock.mult;
> }
>
> /* Code size doesn't matter (vdso is 4k anyway) and this is faster. */
> notrace static int __always_inline do_realtime(struct timespec *ts)
> {
> - unsigned long seq, ns;
> + unsigned long seq;
> + u64 ns;
> int mode;
>
> + ts->tv_nsec = 0;
> do {
> seq = read_seqcount_begin(>od->seq);
> mode = gtod->clock.vclock_mode;
> ts->tv_sec = gtod->wall_time_sec;
> - ts->tv_nsec = gtod->wall_time_nsec;
> - ns = vgetns();
> + ns = gtod->wall_time_snsec;
> + ns += vgetsns();
> + ns >>= gtod->clock.shift;
> } while (unlikely(read_seqcount_retry(>od->seq, seq)));
>
> timespec_add_ns(ts, ns);
> @@ -114,15 +117,18 @@ notrace static int __always_inline do_realtime(struct timespec *ts)
>
> notrace static int do_monotonic(struct timespec *ts)
> {
> - unsigned long seq, ns;
> + unsigned long seq;
> + u64 ns;
> int mode;
>
> + ts->tv_nsec = 0;
> do {
> seq = read_seqcount_begin(>od->seq);
> mode = gtod->clock.vclock_mode;
> ts->tv_sec = gtod->monotonic_time_sec;
> - ts->tv_nsec = gtod->monotonic_time_nsec;
> - ns = vgetns();
> + ns = gtod->monotonic_time_snsec;
> + ns += vgetsns();
> + ns >>= gtod->clock.shift;
> } while (unlikely(read_seqcount_retry(>od->seq, seq)));
> timespec_add_ns(ts, ns);
>
> diff --git a/include/linux/alarmtimer.h b/include/linux/alarmtimer.h
> index 96c5c24..9069694 100644
> --- a/include/linux/alarmtimer.h
> +++ b/include/linux/alarmtimer.h
> @@ -21,7 +21,6 @@ enum alarmtimer_restart {
>
> #define ALARMTIMER_STATE_INACTIVE 0x00
> #define ALARMTIMER_STATE_ENQUEUED 0x01
> -#define ALARMTIMER_STATE_CALLBACK 0x02
>
> /**
> * struct alarm - Alarm timer structure
> @@ -35,6 +34,7 @@ enum alarmtimer_restart {
> */
> struct alarm {
> struct timerqueue_node node;
> + struct hrtimer timer;
> enum alarmtimer_restart (*function)(struct alarm *, ktime_t now);
> enum alarmtimer_type type;
> int state;
> @@ -43,39 +43,12 @@ struct alarm {
>
> void alarm_init(struct alarm *alarm, enum alarmtimer_type type,
> enum alarmtimer_restart (*function)(struct alarm *, ktime_t));
> -void alarm_start(struct alarm *alarm, ktime_t start);
> +int alarm_start(struct alarm *alarm, ktime_t start);
> int alarm_try_to_cancel(struct alarm *alarm);
> int alarm_cancel(struct alarm *alarm);
>
> u64 alarm_forward(struct alarm *alarm, ktime_t now, ktime_t interval);
>
> -/*
> - * A alarmtimer is active, when it is enqueued into timerqueue or the
> - * callback function is running.
> - */
> -static inline int alarmtimer_active(const struct alarm *timer)
> -{
> - return timer->state != ALARMTIMER_STATE_INACTIVE;
> -}
> -
> -/*
> - * Helper function to check, whether the timer is on one of the queues
> - */
> -static inline int alarmtimer_is_queued(struct alarm *timer)
> -{
> - return timer->state & ALARMTIMER_STATE_ENQUEUED;
> -}
> -
> -/*
> - * Helper function to check, whether the timer is running the callback
> - * function
> - */
> -static inline int alarmtimer_callback_running(struct alarm *timer)
> -{
> - return timer->state & ALARMTIMER_STATE_CALLBACK;
> -}
> -
> -
> /* Provide way to access the rtc device being used by alarmtimers */
> struct rtc_device *alarmtimer_get_rtcdev(void);
>
> diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h
> index fbe89e1..4dceaf8 100644
> --- a/include/linux/clocksource.h
> +++ b/include/linux/clocksource.h
> @@ -319,22 +319,6 @@ static inline void __clocksource_updatefreq_khz(struct clocksource *cs, u32 khz)
> __clocksource_updatefreq_scale(cs, 1000, khz);
> }
>
> -#ifdef CONFIG_GENERIC_TIME_VSYSCALL
> -extern void
> -update_vsyscall(struct timespec *ts, struct timespec *wtm,
> - struct clocksource *c, u32 mult);
> -extern void update_vsyscall_tz(void);
> -#else
> -static inline void
> -update_vsyscall(struct timespec *ts, struct timespec *wtm,
> - struct clocksource *c, u32 mult)
> -{
> -}
> -
> -static inline void update_vsyscall_tz(void)
> -{
> -}
> -#endif
>
> extern void timekeeping_notify(struct clocksource *clock);
>
> diff --git a/include/linux/jiffies.h b/include/linux/jiffies.h
> index 8268054..c6d5b2a 100644
> --- a/include/linux/jiffies.h
> +++ b/include/linux/jiffies.h
> @@ -51,31 +51,17 @@
> #define SH_DIV(NOM,DEN,LSH) ( (((NOM) / (DEN)) << (LSH)) \
> + ((((NOM) % (DEN)) << (LSH)) + (DEN) / 2) / (DEN))
>
> -#ifdef CLOCK_TICK_RATE
> /* LATCH is used in the interval timer and ftape setup. */
> -# define LATCH ((CLOCK_TICK_RATE + HZ/2) / HZ) /* For divider */
> +#define LATCH ((CLOCK_TICK_RATE + HZ/2) / HZ) /* For divider */
>
> -/*
> - * HZ is the requested value. However the CLOCK_TICK_RATE may not allow
> - * for exactly HZ. So SHIFTED_HZ is high res HZ ("<< 8" is for accuracy)
> - */
> -# define SHIFTED_HZ (SH_DIV(CLOCK_TICK_RATE, LATCH, 8))
> -#else
> -# define SHIFTED_HZ (HZ << 8)
> -#endif
> +extern int register_refined_jiffies(long clock_tick_rate);
>
> /* TICK_NSEC is the time between ticks in nsec assuming SHIFTED_HZ */
> -#define TICK_NSEC (SH_DIV(1000000UL * 1000, SHIFTED_HZ, 8))
> +#define TICK_NSEC ((NSEC_PER_SEC+HZ/2)/HZ)
>
> /* TICK_USEC is the time between ticks in usec assuming fake USER_HZ */
> #define TICK_USEC ((1000000UL + USER_HZ/2) / USER_HZ)
>
> -/*
> - * TICK_USEC_TO_NSEC is the time between ticks in nsec assuming SHIFTED_HZ and
> - * a value TUSEC for TICK_USEC (can be set bij adjtimex)
> - */
> -#define TICK_USEC_TO_NSEC(TUSEC) (SH_DIV(TUSEC * USER_HZ * 1000, SHIFTED_HZ, 8))
> -
> /* some arch's have a small-data section that can be accessed register-relative
> * but that can only take up to, say, 4-byte variables. jiffies being part of
> * an 8-byte variable may not be correctly accessed unless we force the issue
> diff --git a/include/linux/timekeeper_internal.h b/include/linux/timekeeper_internal.h
> new file mode 100644
> index 0000000..e1d558e
> --- /dev/null
> +++ b/include/linux/timekeeper_internal.h
> @@ -0,0 +1,108 @@
> +/*
> + * You SHOULD NOT be including this unless you're vsyscall
> + * handling code or timekeeping internal code!
> + */
> +
> +#ifndef _LINUX_TIMEKEEPER_INTERNAL_H
> +#define _LINUX_TIMEKEEPER_INTERNAL_H
> +
> +#include <linux/clocksource.h>
> +#include <linux/jiffies.h>
> +#include <linux/time.h>
> +
> +/* Structure holding internal timekeeping values. */
> +struct timekeeper {
> + /* Current clocksource used for timekeeping. */
> + struct clocksource *clock;
> + /* NTP adjusted clock multiplier */
> + u32 mult;
> + /* The shift value of the current clocksource. */
> + u32 shift;
> + /* Number of clock cycles in one NTP interval. */
> + cycle_t cycle_interval;
> + /* Number of clock shifted nano seconds in one NTP interval. */
> + u64 xtime_interval;
> + /* shifted nano seconds left over when rounding cycle_interval */
> + s64 xtime_remainder;
> + /* Raw nano seconds accumulated per NTP interval. */
> + u32 raw_interval;
> +
> + /* Current CLOCK_REALTIME time in seconds */
> + u64 xtime_sec;
> + /* Clock shifted nano seconds */
> + u64 xtime_nsec;
> +
> + /* Difference between accumulated time and NTP time in ntp
> + * shifted nano seconds. */
> + s64 ntp_error;
> + /* Shift conversion between clock shifted nano seconds and
> + * ntp shifted nano seconds. */
> + u32 ntp_error_shift;
> +
> + /*
> + * wall_to_monotonic is what we need to add to xtime (or xtime corrected
> + * for sub jiffie times) to get to monotonic time. Monotonic is pegged
> + * at zero at system boot time, so wall_to_monotonic will be negative,
> + * however, we will ALWAYS keep the tv_nsec part positive so we can use
> + * the usual normalization.
> + *
> + * wall_to_monotonic is moved after resume from suspend for the
> + * monotonic time not to jump. We need to add total_sleep_time to
> + * wall_to_monotonic to get the real boot based time offset.
> + *
> + * - wall_to_monotonic is no longer the boot time, getboottime must be
> + * used instead.
> + */
> + struct timespec wall_to_monotonic;
> + /* Offset clock monotonic -> clock realtime */
> + ktime_t offs_real;
> + /* time spent in suspend */
> + struct timespec total_sleep_time;
> + /* Offset clock monotonic -> clock boottime */
> + ktime_t offs_boot;
> + /* The raw monotonic time for the CLOCK_MONOTONIC_RAW posix clock. */
> + struct timespec raw_time;
> + /* Seqlock for all timekeeper values */
> + seqlock_t lock;
> +};
> +
> +static inline struct timespec tk_xtime(struct timekeeper *tk)
> +{
> + struct timespec ts;
> +
> + ts.tv_sec = tk->xtime_sec;
> + ts.tv_nsec = (long)(tk->xtime_nsec >> tk->shift);
> + return ts;
> +}
> +
> +
> +#ifdef CONFIG_GENERIC_TIME_VSYSCALL
> +
> +extern void update_vsyscall(struct timekeeper *tk);
> +extern void update_vsyscall_tz(void);
> +
> +#elif defined(CONFIG_GENERIC_TIME_VSYSCALL_OLD)
> +
> +extern void update_vsyscall_old(struct timespec *ts, struct timespec *wtm,
> + struct clocksource *c, u32 mult);
> +extern void update_vsyscall_tz(void);
> +
> +static inline void update_vsyscall(struct timekeeper *tk)
> +{
> + struct timespec xt;
> +
> + xt = tk_xtime(tk);
> + update_vsyscall_old(&xt, &tk->wall_to_monotonic, tk->clock, tk->mult);
> +}
> +
> +#else
> +
> +static inline void update_vsyscall(struct timekeeper *tk)
> +{
> +}
> +static inline void update_vsyscall_tz(void)
> +{
> +}
> +#endif
> +
> +#endif /* _LINUX_TIMEKEEPER_INTERNAL_H */
> diff --git a/include/linux/timer.h b/include/linux/timer.h
> index 6abd913..8c5a197 100644
> --- a/include/linux/timer.h
> +++ b/include/linux/timer.h
> @@ -49,147 +49,112 @@ extern struct tvec_base boot_tvec_bases;
> #endif
>
> /*
> - * Note that all tvec_bases are 2 byte aligned and lower bit of
> - * base in timer_list is guaranteed to be zero. Use the LSB to
> - * indicate whether the timer is deferrable.
> + * Note that all tvec_bases are at least 4 byte aligned and lower two bits
> + * of base in timer_list is guaranteed to be zero. Use them for flags.
> *
> * A deferrable timer will work normally when the system is busy, but
> * will not cause a CPU to come out of idle just to service it; instead,
> * the timer will be serviced when the CPU eventually wakes up with a
> * subsequent non-deferrable timer.
> + *
> + * An irqsafe timer is executed with IRQ disabled and it's safe to wait for
> + * the completion of the running instance from IRQ handlers, for example,
> + * by calling del_timer_sync().
> + *
> + * Note: The irq disabled callback execution is a special case for
> + * workqueue locking issues. It's not meant for executing random crap
> + * with interrupts disabled. Abuse is monitored!
> */
> -#define TBASE_DEFERRABLE_FLAG (0x1)
> +#define TIMER_DEFERRABLE 0x1LU
> +#define TIMER_IRQSAFE 0x2LU
>
> -#define TIMER_INITIALIZER(_function, _expires, _data) { \
> +#define TIMER_FLAG_MASK 0x3LU
> +
> +#define __TIMER_INITIALIZER(_function, _expires, _data, _flags) { \
> .entry = { .prev = TIMER_ENTRY_STATIC }, \
> .function = (_function), \
> .expires = (_expires), \
> .data = (_data), \
> - .base = &boot_tvec_bases, \
> + .base = (void *)((unsigned long)&boot_tvec_bases + (_flags)), \
> .slack = -1, \
> __TIMER_LOCKDEP_MAP_INITIALIZER( \
> __FILE__ ":" __stringify(__LINE__)) \
> }
>
> -#define TBASE_MAKE_DEFERRED(ptr) ((struct tvec_base *) \
> - ((unsigned char *)(ptr) + TBASE_DEFERRABLE_FLAG))
> +#define TIMER_INITIALIZER(_function, _expires, _data) \
> + __TIMER_INITIALIZER((_function), (_expires), (_data), 0)
>
> -#define TIMER_DEFERRED_INITIALIZER(_function, _expires, _data) {\
> - .entry = { .prev = TIMER_ENTRY_STATIC }, \
> - .function = (_function), \
> - .expires = (_expires), \
> - .data = (_data), \
> - .base = TBASE_MAKE_DEFERRED(&boot_tvec_bases), \
> - __TIMER_LOCKDEP_MAP_INITIALIZER( \
> - __FILE__ ":" __stringify(__LINE__)) \
> - }
> +#define TIMER_DEFERRED_INITIALIZER(_function, _expires, _data) \
> + __TIMER_INITIALIZER((_function), (_expires), (_data), TIMER_DEFERRABLE)
>
> #define DEFINE_TIMER(_name, _function, _expires, _data) \
> struct timer_list _name = \
> TIMER_INITIALIZER(_function, _expires, _data)
>
> -void init_timer_key(struct timer_list *timer,
> - const char *name,
> - struct lock_class_key *key);
> -void init_timer_deferrable_key(struct timer_list *timer,
> - const char *name,
> - struct lock_class_key *key);
> +void init_timer_key(struct timer_list *timer, unsigned int flags,
> + const char *name, struct lock_class_key *key);
> +
> +#ifdef CONFIG_DEBUG_OBJECTS_TIMERS
> +extern void init_timer_on_stack_key(struct timer_list *timer,
> + unsigned int flags, const char *name,
> + struct lock_class_key *key);
> +extern void destroy_timer_on_stack(struct timer_list *timer);
> +#else
> +static inline void destroy_timer_on_stack(struct timer_list *timer) { }
> +static inline void init_timer_on_stack_key(struct timer_list *timer,
> + unsigned int flags, const char *name,
> + struct lock_class_key *key)
> +{
> + init_timer_key(timer, flags, name, key);
> +}
> +#endif
>
> #ifdef CONFIG_LOCKDEP
> -#define init_timer(timer) \
> +#define __init_timer(_timer, _flags) \
> do { \
> static struct lock_class_key __key; \
> - init_timer_key((timer), #timer, &__key); \
> + init_timer_key((_timer), (_flags), #_timer, &__key); \
> } while (0)
>
> -#define init_timer_deferrable(timer) \
> +#define __init_timer_on_stack(_timer, _flags) \
> do { \
> static struct lock_class_key __key; \
> - init_timer_deferrable_key((timer), #timer, &__key); \
> + init_timer_on_stack_key((_timer), (_flags), #_timer, &__key); \
> } while (0)
> +#else
> +#define __init_timer(_timer, _flags) \
> + init_timer_key((_timer), (_flags), NULL, NULL)
> +#define __init_timer_on_stack(_timer, _flags) \
> + init_timer_on_stack_key((_timer), (_flags), NULL, NULL)
> +#endif
>
> +#define init_timer(timer) \
> + __init_timer((timer), 0)
> +#define init_timer_deferrable(timer) \
> + __init_timer((timer), TIMER_DEFERRABLE)
> #define init_timer_on_stack(timer) \
> + __init_timer_on_stack((timer), 0)
> +
> +#define __setup_timer(_timer, _fn, _data, _flags) \
> do { \
> - static struct lock_class_key __key; \
> - init_timer_on_stack_key((timer), #timer, &__key); \
> + __init_timer((_timer), (_flags)); \
> + (_timer)->function = (_fn); \
> + (_timer)->data = (_data); \
> } while (0)
>
> -#define setup_timer(timer, fn, data) \
> +#define __setup_timer_on_stack(_timer, _fn, _data, _flags) \
> do { \
> - static struct lock_class_key __key; \
> - setup_timer_key((timer), #timer, &__key, (fn), (data));\
> + __init_timer_on_stack((_timer), (_flags)); \
> + (_timer)->function = (_fn); \
> + (_timer)->data = (_data); \
> } while (0)
>
> +#define setup_timer(timer, fn, data) \
> + __setup_timer((timer), (fn), (data), 0)
> #define setup_timer_on_stack(timer, fn, data) \
> - do { \
> - static struct lock_class_key __key; \
> - setup_timer_on_stack_key((timer), #timer, &__key, \
> - (fn), (data)); \
> - } while (0)
> + __setup_timer_on_stack((timer), (fn), (data), 0)
> #define setup_deferrable_timer_on_stack(timer, fn, data) \
> - do { \
> - static struct lock_class_key __key; \
> - setup_deferrable_timer_on_stack_key((timer), #timer, \
> - &__key, (fn), \
> - (data)); \
> - } while (0)
> -#else
> -#define init_timer(timer)\
> - init_timer_key((timer), NULL, NULL)
> -#define init_timer_deferrable(timer)\
> - init_timer_deferrable_key((timer), NULL, NULL)
> -#define init_timer_on_stack(timer)\
> - init_timer_on_stack_key((timer), NULL, NULL)
> -#define setup_timer(timer, fn, data)\
> - setup_timer_key((timer), NULL, NULL, (fn), (data))
> -#define setup_timer_on_stack(timer, fn, data)\
> - setup_timer_on_stack_key((timer), NULL, NULL, (fn), (data))
> -#define setup_deferrable_timer_on_stack(timer, fn, data)\
> - setup_deferrable_timer_on_stack_key((timer), NULL, NULL, (fn), (data))
> -#endif
> -
> -#ifdef CONFIG_DEBUG_OBJECTS_TIMERS
> -extern void init_timer_on_stack_key(struct timer_list *timer,
> - const char *name,
> - struct lock_class_key *key);
> -extern void destroy_timer_on_stack(struct timer_list *timer);
> -#else
> -static inline void destroy_timer_on_stack(struct timer_list *timer) { }
> -static inline void init_timer_on_stack_key(struct timer_list *timer,
> - const char *name,
> - struct lock_class_key *key)
> -{
> - init_timer_key(timer, name, key);
> -}
> -#endif
> -
> -static inline void setup_timer_key(struct timer_list * timer,
> - const char *name,
> - struct lock_class_key *key,
> - void (*function)(unsigned long),
> - unsigned long data)
> -{
> - timer->function = function;
> - timer->data = data;
> - init_timer_key(timer, name, key);
> -}
> -
> -static inline void setup_timer_on_stack_key(struct timer_list *timer,
> - const char *name,
> - struct lock_class_key *key,
> - void (*function)(unsigned long),
> - unsigned long data)
> -{
> - timer->function = function;
> - timer->data = data;
> - init_timer_on_stack_key(timer, name, key);
> -}
> -
> -extern void setup_deferrable_timer_on_stack_key(struct timer_list *timer,
> - const char *name,
> - struct lock_class_key *key,
> - void (*function)(unsigned long),
> - unsigned long data);
> + __setup_timer_on_stack((timer), (fn), (data), TIMER_DEFERRABLE)
>
> /**
> * timer_pending - is a timer pending?
> diff --git a/kernel/time.c b/kernel/time.c
> index ba744cf..d226c6a 100644
> --- a/kernel/time.c
> +++ b/kernel/time.c
> @@ -30,7 +30,7 @@
> #include <linux/export.h>
> #include <linux/timex.h>
> #include <linux/capability.h>
> -#include <linux/clocksource.h>
> +#include <linux/timekeeper_internal.h>
> #include <linux/errno.h>
> #include <linux/syscalls.h>
> #include <linux/security.h>
> diff --git a/kernel/time/Kconfig b/kernel/time/Kconfig
> index fd42bd4..8601f0d 100644
> --- a/kernel/time/Kconfig
> +++ b/kernel/time/Kconfig
> @@ -16,6 +16,10 @@ config ARCH_CLOCKSOURCE_DATA
> config GENERIC_TIME_VSYSCALL
> bool
>
> +# Timekeeping vsyscall support
> +config GENERIC_TIME_VSYSCALL_OLD
> + bool
> +
> # ktime_t scalar 64bit nsec representation
> config KTIME_SCALAR
> bool
> diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c
> index aa27d39..f11d83b 100644
> --- a/kernel/time/alarmtimer.c
> +++ b/kernel/time/alarmtimer.c
> @@ -37,7 +37,6 @@
> static struct alarm_base {
> spinlock_t lock;
> struct timerqueue_head timerqueue;
> - struct hrtimer timer;
> ktime_t (*gettime)(void);
> clockid_t base_clockid;
> } alarm_bases[ALARM_NUMTYPE];
> @@ -46,6 +45,8 @@ static struct alarm_base {
> static ktime_t freezer_delta;
> static DEFINE_SPINLOCK(freezer_delta_lock);
>
> +static struct wakeup_source *ws;
> +
> #ifdef CONFIG_RTC_CLASS
> /* rtc timer and device for setting alarm wakeups at suspend */
> static struct rtc_timer rtctimer;
> @@ -130,50 +131,35 @@ static inline void alarmtimer_rtc_timer_init(void) { }
> * @base: pointer to the base where the timer is being run
> * @alarm: pointer to alarm being enqueued.
> *
> - * Adds alarm to a alarm_base timerqueue and if necessary sets
> - * an hrtimer to run.
> + * Adds alarm to a alarm_base timerqueue
> *
> * Must hold base->lock when calling.
> */
> static void alarmtimer_enqueue(struct alarm_base *base, struct alarm *alarm)
> {
> + if (alarm->state & ALARMTIMER_STATE_ENQUEUED)
> + timerqueue_del(&base->timerqueue, &alarm->node);
> +
> timerqueue_add(&base->timerqueue, &alarm->node);
> alarm->state |= ALARMTIMER_STATE_ENQUEUED;
> -
> - if (&alarm->node == timerqueue_getnext(&base->timerqueue)) {
> - hrtimer_try_to_cancel(&base->timer);
> - hrtimer_start(&base->timer, alarm->node.expires,
> - HRTIMER_MODE_ABS);
> - }
> }
>
> /**
> - * alarmtimer_remove - Removes an alarm timer from an alarm_base timerqueue
> + * alarmtimer_dequeue - Removes an alarm timer from an alarm_base timerqueue
> * @base: pointer to the base where the timer is running
> * @alarm: pointer to alarm being removed
> *
> - * Removes alarm to a alarm_base timerqueue and if necessary sets
> - * a new timer to run.
> + * Removes alarm to a alarm_base timerqueue
> *
> * Must hold base->lock when calling.
> */
> -static void alarmtimer_remove(struct alarm_base *base, struct alarm *alarm)
> +static void alarmtimer_dequeue(struct alarm_base *base, struct alarm *alarm)
> {
> - struct timerqueue_node *next = timerqueue_getnext(&base->timerqueue);
> -
> if (!(alarm->state & ALARMTIMER_STATE_ENQUEUED))
> return;
>
> timerqueue_del(&base->timerqueue, &alarm->node);
> alarm->state &= ~ALARMTIMER_STATE_ENQUEUED;
> -
> - if (next == &alarm->node) {
> - hrtimer_try_to_cancel(&base->timer);
> - next = timerqueue_getnext(&base->timerqueue);
> - if (!next)
> - return;
> - hrtimer_start(&base->timer, next->expires, HRTIMER_MODE_ABS);
> - }
> }
>
>
> @@ -188,42 +174,23 @@ static void alarmtimer_remove(struct alarm_base *base, struct alarm *alarm)
> */
> static enum hrtimer_restart alarmtimer_fired(struct hrtimer *timer)
> {
> - struct alarm_base *base = container_of(timer, struct alarm_base, timer);
> - struct timerqueue_node *next;
> + struct alarm *alarm = container_of(timer, struct alarm, timer);
> + struct alarm_base *base = &alarm_bases[alarm->type];
> unsigned long flags;
> - ktime_t now;
> int ret = HRTIMER_NORESTART;
> int restart = ALARMTIMER_NORESTART;
>
> spin_lock_irqsave(&base->lock, flags);
> - now = base->gettime();
> - while ((next = timerqueue_getnext(&base->timerqueue))) {
> - struct alarm *alarm;
> - ktime_t expired = next->expires;
> -
> - if (expired.tv64 > now.tv64)
> - break;
> -
> - alarm = container_of(next, struct alarm, node);
> -
> - timerqueue_del(&base->timerqueue, &alarm->node);
> - alarm->state &= ~ALARMTIMER_STATE_ENQUEUED;
> -
> - alarm->state |= ALARMTIMER_STATE_CALLBACK;
> - spin_unlock_irqrestore(&base->lock, flags);
> - if (alarm->function)
> - restart = alarm->function(alarm, now);
> - spin_lock_irqsave(&base->lock, flags);
> - alarm->state &= ~ALARMTIMER_STATE_CALLBACK;
> + alarmtimer_dequeue(base, alarm);
> + spin_unlock_irqrestore(&base->lock, flags);
>
> - if (restart != ALARMTIMER_NORESTART) {
> - timerqueue_add(&base->timerqueue, &alarm->node);
> - alarm->state |= ALARMTIMER_STATE_ENQUEUED;
> - }
> - }
> + if (alarm->function)
> + restart = alarm->function(alarm, base->gettime());
>
> - if (next) {
> - hrtimer_set_expires(&base->timer, next->expires);
> + spin_lock_irqsave(&base->lock, flags);
> + if (restart != ALARMTIMER_NORESTART) {
> + hrtimer_set_expires(&alarm->timer, alarm->node.expires);
> + alarmtimer_enqueue(base, alarm);
> ret = HRTIMER_RESTART;
> }
> spin_unlock_irqrestore(&base->lock, flags);
> @@ -250,6 +217,7 @@ static int alarmtimer_suspend(struct device *dev)
> unsigned long flags;
> struct rtc_device *rtc;
> int i;
> + int ret;
>
> spin_lock_irqsave(&freezer_delta_lock, flags);
> min = freezer_delta;
> @@ -279,8 +247,10 @@ static int alarmtimer_suspend(struct device *dev)
> if (min.tv64 == 0)
> return 0;
>
> - /* XXX - Should we enforce a minimum sleep time? */
> - WARN_ON(min.tv64 < NSEC_PER_SEC);
> + if (ktime_to_ns(min) < 2 * NSEC_PER_SEC) {
> + __pm_wakeup_event(ws, 2 * MSEC_PER_SEC);
> + return -EBUSY;
> + }
>
> /* Setup an rtc timer to fire that far in the future */
> rtc_timer_cancel(rtc, &rtctimer);
> @@ -288,9 +258,11 @@ static int alarmtimer_suspend(struct device *dev)
> now = rtc_tm_to_ktime(tm);
> now = ktime_add(now, min);
>
> - rtc_timer_start(rtc, &rtctimer, now, ktime_set(0, 0));
> -
> - return 0;
> + /* Set alarm, if in the past reject suspend briefly to handle */
> + ret = rtc_timer_start(rtc, &rtctimer, now, ktime_set(0, 0));
> + if (ret < 0)
> + __pm_wakeup_event(ws, MSEC_PER_SEC);
> + return ret;
> }
> #else
> static int alarmtimer_suspend(struct device *dev)
> @@ -324,6 +296,9 @@ void alarm_init(struct alarm *alarm, enum alarmtimer_type type,
> enum alarmtimer_restart (*function)(struct alarm *, ktime_t))
> {
> timerqueue_init(&alarm->node);
> + hrtimer_init(&alarm->timer, alarm_bases[type].base_clockid,
> + HRTIMER_MODE_ABS);
> + alarm->timer.function = alarmtimer_fired;
> alarm->function = function;
> alarm->type = type;
> alarm->state = ALARMTIMER_STATE_INACTIVE;
> @@ -334,17 +309,19 @@ void alarm_init(struct alarm *alarm, enum alarmtimer_type type,
> * @alarm: ptr to alarm to set
> * @start: time to run the alarm
> */
> -void alarm_start(struct alarm *alarm, ktime_t start)
> +int alarm_start(struct alarm *alarm, ktime_t start)
> {
> struct alarm_base *base = &alarm_bases[alarm->type];
> unsigned long flags;
> + int ret;
>
> spin_lock_irqsave(&base->lock, flags);
> - if (alarmtimer_active(alarm))
> - alarmtimer_remove(base, alarm);
> alarm->node.expires = start;
> alarmtimer_enqueue(base, alarm);
> + ret = hrtimer_start(&alarm->timer, alarm->node.expires,
> + HRTIMER_MODE_ABS);
> spin_unlock_irqrestore(&base->lock, flags);
> + return ret;
> }
>
> /**
> @@ -358,18 +335,12 @@ int alarm_try_to_cancel(struct alarm *alarm)
> {
> struct alarm_base *base = &alarm_bases[alarm->type];
> unsigned long flags;
> - int ret = -1;
> - spin_lock_irqsave(&base->lock, flags);
> -
> - if (alarmtimer_callback_running(alarm))
> - goto out;
> + int ret;
>
> - if (alarmtimer_is_queued(alarm)) {
> - alarmtimer_remove(base, alarm);
> - ret = 1;
> - } else
> - ret = 0;
> -out:
> + spin_lock_irqsave(&base->lock, flags);
> + ret = hrtimer_try_to_cancel(&alarm->timer);
> + if (ret >= 0)
> + alarmtimer_dequeue(base, alarm);
> spin_unlock_irqrestore(&base->lock, flags);
> return ret;
> }
> @@ -802,10 +773,6 @@ static int __init alarmtimer_init(void)
> for (i = 0; i < ALARM_NUMTYPE; i++) {
> timerqueue_init_head(&alarm_bases[i].timerqueue);
> spin_lock_init(&alarm_bases[i].lock);
> - hrtimer_init(&alarm_bases[i].timer,
> - alarm_bases[i].base_clockid,
> - HRTIMER_MODE_ABS);
> - alarm_bases[i].timer.function = alarmtimer_fired;
> }
>
> error = alarmtimer_rtc_interface_setup();
> @@ -821,6 +788,7 @@ static int __init alarmtimer_init(void)
> error = PTR_ERR(pdev);
> goto out_drv;
> }
> + ws = wakeup_source_register("alarmtimer");
> return 0;
>
> out_drv:
> diff --git a/kernel/time/jiffies.c b/kernel/time/jiffies.c
> index 46da053..6629bf7 100644
> --- a/kernel/time/jiffies.c
> +++ b/kernel/time/jiffies.c
> @@ -37,7 +37,7 @@
> * requested HZ value. It is also not recommended
> * for "tick-less" systems.
> */
> -#define NSEC_PER_JIFFY ((u32)((((u64)NSEC_PER_SEC)<<8)/SHIFTED_HZ))
> +#define NSEC_PER_JIFFY ((NSEC_PER_SEC+HZ/2)/HZ)
>
> /* Since jiffies uses a simple NSEC_PER_JIFFY multiplier
> * conversion, the .shift value could be zero. However
> @@ -95,3 +95,33 @@ struct clocksource * __init __weak clocksource_default_clock(void)
> {
> return &clocksource_jiffies;
> }
> +
> +struct clocksource refined_jiffies;
> +
> +int register_refined_jiffies(long cycles_per_second)
> +{
> + u64 nsec_per_tick, shift_hz;
> + long cycles_per_tick;
> +
> +
> +
> + refined_jiffies = clocksource_jiffies;
> + refined_jiffies.name = "refined-jiffies";
> + refined_jiffies.rating++;
> +
> + /* Calc cycles per tick */
> + cycles_per_tick = (cycles_per_second + HZ/2)/HZ;
> + /* shift_hz stores hz<<8 for extra accuracy */
> + shift_hz = (u64)cycles_per_second << 8;
> + shift_hz += cycles_per_tick/2;
> + do_div(shift_hz, cycles_per_tick);
> + /* Calculate nsec_per_tick using shift_hz */
> + nsec_per_tick = (u64)NSEC_PER_SEC << 8;
> + nsec_per_tick += (u32)shift_hz/2;
> + do_div(nsec_per_tick, (u32)shift_hz);
> +
> + refined_jiffies.mult = ((u32)nsec_per_tick) << JIFFIES_SHIFT;
> +
> + clocksource_register(&refined_jiffies);
> + return 0;
> +}
> diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
> index d3b91e7..3eb3fc7c 100644
> --- a/kernel/time/timekeeping.c
> +++ b/kernel/time/timekeeping.c
> @@ -8,6 +8,7 @@
> *
> */
>
> +#include <linux/timekeeper_internal.h>
> #include <linux/module.h>
> #include <linux/interrupt.h>
> #include <linux/percpu.h>
> @@ -21,61 +22,6 @@
> #include <linux/tick.h>
> #include <linux/stop_machine.h>
>
> -/* Structure holding internal timekeeping values. */
> -struct timekeeper {
> - /* Current clocksource used for timekeeping. */
> - struct clocksource *clock;
> - /* NTP adjusted clock multiplier */
> - u32 mult;
> - /* The shift value of the current clocksource. */
> - u32 shift;
> - /* Number of clock cycles in one NTP interval. */
> - cycle_t cycle_interval;
> - /* Number of clock shifted nano seconds in one NTP interval. */
> - u64 xtime_interval;
> - /* shifted nano seconds left over when rounding cycle_interval */
> - s64 xtime_remainder;
> - /* Raw nano seconds accumulated per NTP interval. */
> - u32 raw_interval;
> -
> - /* Current CLOCK_REALTIME time in seconds */
> - u64 xtime_sec;
> - /* Clock shifted nano seconds */
> - u64 xtime_nsec;
> -
> - /* Difference between accumulated time and NTP time in ntp
> - * shifted nano seconds. */
> - s64 ntp_error;
> - /* Shift conversion between clock shifted nano seconds and
> - * ntp shifted nano seconds. */
> - u32 ntp_error_shift;
> -
> - /*
> - * wall_to_monotonic is what we need to add to xtime (or xtime corrected
> - * for sub jiffie times) to get to monotonic time. Monotonic is pegged
> - * at zero at system boot time, so wall_to_monotonic will be negative,
> - * however, we will ALWAYS keep the tv_nsec part positive so we can use
> - * the usual normalization.
> - *
> - * wall_to_monotonic is moved after resume from suspend for the
> - * monotonic time not to jump. We need to add total_sleep_time to
> - * wall_to_monotonic to get the real boot based time offset.
> - *
> - * - wall_to_monotonic is no longer the boot time, getboottime must be
> - * used instead.
> - */
> - struct timespec wall_to_monotonic;
> - /* Offset clock monotonic -> clock realtime */
> - ktime_t offs_real;
> - /* time spent in suspend */
> - struct timespec total_sleep_time;
> - /* Offset clock monotonic -> clock boottime */
> - ktime_t offs_boot;
> - /* The raw monotonic time for the CLOCK_MONOTONIC_RAW posix clock. */
> - struct timespec raw_time;
> - /* Seqlock for all timekeeper values */
> - seqlock_t lock;
> -};
>
> static struct timekeeper timekeeper;
>
> @@ -96,15 +42,6 @@ static inline void tk_normalize_xtime(struct timekeeper *tk)
> }
> }
>
> -static struct timespec tk_xtime(struct timekeeper *tk)
> -{
> - struct timespec ts;
> -
> - ts.tv_sec = tk->xtime_sec;
> - ts.tv_nsec = (long)(tk->xtime_nsec >> tk->shift);
> - return ts;
> -}
> -
> static void tk_set_xtime(struct timekeeper *tk, const struct timespec *ts)
> {
> tk->xtime_sec = ts->tv_sec;
> @@ -246,14 +183,11 @@ static inline s64 timekeeping_get_ns_raw(struct timekeeper *tk)
> /* must hold write on timekeeper.lock */
> static void timekeeping_update(struct timekeeper *tk, bool clearntp)
> {
> - struct timespec xt;
> -
> if (clearntp) {
> tk->ntp_error = 0;
> ntp_clear();
> }
> - xt = tk_xtime(tk);
> - update_vsyscall(&xt, &tk->wall_to_monotonic, tk->clock, tk->mult);
> + update_vsyscall(tk);
> }
>
> /**
> @@ -1111,7 +1045,7 @@ static cycle_t logarithmic_accumulation(struct timekeeper *tk, cycle_t offset,
> accumulate_nsecs_to_secs(tk);
>
> /* Accumulate raw time */
> - raw_nsecs = tk->raw_interval << shift;
> + raw_nsecs = (u64)tk->raw_interval << shift;
> raw_nsecs += tk->raw_time.tv_nsec;
> if (raw_nsecs >= NSEC_PER_SEC) {
> u64 raw_secs = raw_nsecs;
> @@ -1128,6 +1062,33 @@ static cycle_t logarithmic_accumulation(struct timekeeper *tk, cycle_t offset,
> return offset;
> }
>
> +#ifdef CONFIG_GENERIC_TIME_VSYSCALL_OLD
> +static inline void old_vsyscall_fixup(struct timekeeper *tk)
> +{
> + s64 remainder;
> +
> + /*
> + * Store only full nanoseconds into xtime_nsec after rounding
> + * it up and add the remainder to the error difference.
> + * XXX - This is necessary to avoid small 1ns inconsistnecies caused
> + * by truncating the remainder in vsyscalls. However, it causes
> + * additional work to be done in timekeeping_adjust(). Once
> + * the vsyscall implementations are converted to use xtime_nsec
> + * (shifted nanoseconds), and CONFIG_GENERIC_TIME_VSYSCALL_OLD
> + * users are removed, this can be killed.
> + */
> + remainder = tk->xtime_nsec & ((1ULL << tk->shift) - 1);
> + tk->xtime_nsec -= remainder;
> + tk->xtime_nsec += 1ULL << tk->shift;
> + tk->ntp_error += remainder << tk->ntp_error_shift;
> +
> +}
> +#else
> +#define old_vsyscall_fixup(tk)
> +#endif
> +
> +
> +
> /**
> * update_wall_time - Uses the current clocksource to increment the wall time
> *
> @@ -1139,7 +1100,6 @@ static void update_wall_time(void)
> cycle_t offset;
> int shift = 0, maxshift;
> unsigned long flags;
> - s64 remainder;
>
> write_seqlock_irqsave(&tk->lock, flags);
>
> @@ -1181,20 +1141,11 @@ static void update_wall_time(void)
> /* correct the clock when NTP error is too big */
> timekeeping_adjust(tk, offset);
>
> -
> /*
> - * Store only full nanoseconds into xtime_nsec after rounding
> - * it up and add the remainder to the error difference.
> - * XXX - This is necessary to avoid small 1ns inconsistnecies caused
> - * by truncating the remainder in vsyscalls. However, it causes
> - * additional work to be done in timekeeping_adjust(). Once
> - * the vsyscall implementations are converted to use xtime_nsec
> - * (shifted nanoseconds), this can be killed.
> - */
> - remainder = tk->xtime_nsec & ((1ULL << tk->shift) - 1);
> - tk->xtime_nsec -= remainder;
> - tk->xtime_nsec += 1ULL << tk->shift;
> - tk->ntp_error += remainder << tk->ntp_error_shift;
> + * XXX This can be killed once everyone converts
> + * to the new update_vsyscall.
> + */
> + old_vsyscall_fixup(tk);
>
> /*
> * Finally, make sure that after the rounding
> diff --git a/kernel/timer.c b/kernel/timer.c
> index 8c5e7b9..367d008 100644
> --- a/kernel/timer.c
> +++ b/kernel/timer.c
> @@ -63,6 +63,7 @@ EXPORT_SYMBOL(jiffies_64);
> #define TVR_SIZE (1 << TVR_BITS)
> #define TVN_MASK (TVN_SIZE - 1)
> #define TVR_MASK (TVR_SIZE - 1)
> +#define MAX_TVAL ((unsigned long)((1ULL << (TVR_BITS + 4*TVN_BITS)) - 1))
>
> struct tvec {
> struct list_head vec[TVN_SIZE];
> @@ -92,24 +93,25 @@ static DEFINE_PER_CPU(struct tvec_base *, tvec_bases) = &boot_tvec_bases;
> /* Functions below help us manage 'deferrable' flag */
> static inline unsigned int tbase_get_deferrable(struct tvec_base *base)
> {
> - return ((unsigned int)(unsigned long)base & TBASE_DEFERRABLE_FLAG);
> + return ((unsigned int)(unsigned long)base & TIMER_DEFERRABLE);
> }
>
> -static inline struct tvec_base *tbase_get_base(struct tvec_base *base)
> +static inline unsigned int tbase_get_irqsafe(struct tvec_base *base)
> {
> - return ((struct tvec_base *)((unsigned long)base & ~TBASE_DEFERRABLE_FLAG));
> + return ((unsigned int)(unsigned long)base & TIMER_IRQSAFE);
> }
>
> -static inline void timer_set_deferrable(struct timer_list *timer)
> +static inline struct tvec_base *tbase_get_base(struct tvec_base *base)
> {
> - timer->base = TBASE_MAKE_DEFERRED(timer->base);
> + return ((struct tvec_base *)((unsigned long)base & ~TIMER_FLAG_MASK));
> }
>
> static inline void
> timer_set_base(struct timer_list *timer, struct tvec_base *new_base)
> {
> - timer->base = (struct tvec_base *)((unsigned long)(new_base) |
> - tbase_get_deferrable(timer->base));
> + unsigned long flags = (unsigned long)timer->base & TIMER_FLAG_MASK;
> +
> + timer->base = (struct tvec_base *)((unsigned long)(new_base) | flags);
> }
>
> static unsigned long round_jiffies_common(unsigned long j, int cpu,
> @@ -358,11 +360,12 @@ __internal_add_timer(struct tvec_base *base, struct timer_list *timer)
> vec = base->tv1.vec + (base->timer_jiffies & TVR_MASK);
> } else {
> int i;
> - /* If the timeout is larger than 0xffffffff on 64-bit
> - * architectures then we use the maximum timeout:
> + /* If the timeout is larger than MAX_TVAL (on 64-bit
> + * architectures or with CONFIG_BASE_SMALL=1) then we
> + * use the maximum timeout.
> */
> - if (idx > 0xffffffffUL) {
> - idx = 0xffffffffUL;
> + if (idx > MAX_TVAL) {
> + idx = MAX_TVAL;
> expires = idx + base->timer_jiffies;
> }
> i = (expires >> (TVR_BITS + 3 * TVN_BITS)) & TVN_MASK;
> @@ -563,16 +566,14 @@ static inline void debug_timer_assert_init(struct timer_list *timer)
> debug_object_assert_init(timer, &timer_debug_descr);
> }
>
> -static void __init_timer(struct timer_list *timer,
> - const char *name,
> - struct lock_class_key *key);
> +static void do_init_timer(struct timer_list *timer, unsigned int flags,
> + const char *name, struct lock_class_key *key);
>
> -void init_timer_on_stack_key(struct timer_list *timer,
> - const char *name,
> - struct lock_class_key *key)
> +void init_timer_on_stack_key(struct timer_list *timer, unsigned int flags,
> + const char *name, struct lock_class_key *key)
> {
> debug_object_init_on_stack(timer, &timer_debug_descr);
> - __init_timer(timer, name, key);
> + do_init_timer(timer, flags, name, key);
> }
> EXPORT_SYMBOL_GPL(init_timer_on_stack_key);
>
> @@ -613,12 +614,13 @@ static inline void debug_assert_init(struct timer_list *timer)
> debug_timer_assert_init(timer);
> }
>
> -static void __init_timer(struct timer_list *timer,
> - const char *name,
> - struct lock_class_key *key)
> +static void do_init_timer(struct timer_list *timer, unsigned int flags,
> + const char *name, struct lock_class_key *key)
> {
> + struct tvec_base *base = __raw_get_cpu_var(tvec_bases);
> +
> timer->entry.next = NULL;
> - timer->base = __raw_get_cpu_var(tvec_bases);
> + timer->base = (void *)((unsigned long)base | flags);
> timer->slack = -1;
> #ifdef CONFIG_TIMER_STATS
> timer->start_site = NULL;
> @@ -628,22 +630,10 @@ static void __init_timer(struct timer_list *timer,
> lockdep_init_map(&timer->lockdep_map, name, key, 0);
> }
>
> -void setup_deferrable_timer_on_stack_key(struct timer_list *timer,
> - const char *name,
> - struct lock_class_key *key,
> - void (*function)(unsigned long),
> - unsigned long data)
> -{
> - timer->function = function;
> - timer->data = data;
> - init_timer_on_stack_key(timer, name, key);
> - timer_set_deferrable(timer);
> -}
> -EXPORT_SYMBOL_GPL(setup_deferrable_timer_on_stack_key);
> -
> /**
> * init_timer_key - initialize a timer
> * @timer: the timer to be initialized
> + * @flags: timer flags
> * @name: name of the timer
> * @key: lockdep class key of the fake lock used for tracking timer
> * sync lock dependencies
> @@ -651,24 +641,14 @@ EXPORT_SYMBOL_GPL(setup_deferrable_timer_on_stack_key);
> * init_timer_key() must be done to a timer prior calling *any* of the
> * other timer functions.
> */
> -void init_timer_key(struct timer_list *timer,
> - const char *name,
> - struct lock_class_key *key)
> +void init_timer_key(struct timer_list *timer, unsigned int flags,
> + const char *name, struct lock_class_key *key)
> {
> debug_init(timer);
> - __init_timer(timer, name, key);
> + do_init_timer(timer, flags, name, key);
> }
> EXPORT_SYMBOL(init_timer_key);
>
> -void init_timer_deferrable_key(struct timer_list *timer,
> - const char *name,
> - struct lock_class_key *key)
> -{
> - init_timer_key(timer, name, key);
> - timer_set_deferrable(timer);
> -}
> -EXPORT_SYMBOL(init_timer_deferrable_key);
> -
> static inline void detach_timer(struct timer_list *timer, bool clear_pending)
> {
> struct list_head *entry = &timer->entry;
> @@ -686,7 +666,7 @@ detach_expired_timer(struct timer_list *timer, struct tvec_base *base)
> {
> detach_timer(timer, true);
> if (!tbase_get_deferrable(timer->base))
> - timer->base->active_timers--;
> + base->active_timers--;
> }
>
> static int detach_if_pending(struct timer_list *timer, struct tvec_base *base,
> @@ -697,7 +677,7 @@ static int detach_if_pending(struct timer_list *timer, struct tvec_base *base,
>
> detach_timer(timer, clear_pending);
> if (!tbase_get_deferrable(timer->base)) {
> - timer->base->active_timers--;
> + base->active_timers--;
> if (timer->expires == base->next_timer)
> base->next_timer = base->timer_jiffies;
> }
> @@ -1029,14 +1009,14 @@ EXPORT_SYMBOL(try_to_del_timer_sync);
> *
> * Synchronization rules: Callers must prevent restarting of the timer,
> * otherwise this function is meaningless. It must not be called from
> - * interrupt contexts. The caller must not hold locks which would prevent
> - * completion of the timer's handler. The timer's handler must not call
> - * add_timer_on(). Upon exit the timer is not queued and the handler is
> - * not running on any CPU.
> + * interrupt contexts unless the timer is an irqsafe one. The caller must
> + * not hold locks which would prevent completion of the timer's
> + * handler. The timer's handler must not call add_timer_on(). Upon exit the
> + * timer is not queued and the handler is not running on any CPU.
> *
> - * Note: You must not hold locks that are held in interrupt context
> - * while calling this function. Even if the lock has nothing to do
> - * with the timer in question. Here's why:
> + * Note: For !irqsafe timers, you must not hold locks that are held in
> + * interrupt context while calling this function. Even if the lock has
> + * nothing to do with the timer in question. Here's why:
> *
> * CPU0 CPU1
> * ---- ----
> @@ -1073,7 +1053,7 @@ int del_timer_sync(struct timer_list *timer)
> * don't use it in hardirq context, because it
> * could lead to deadlock.
> */
> - WARN_ON(in_irq());
> + WARN_ON(in_irq() && !tbase_get_irqsafe(timer->base));
> for (;;) {
> int ret = try_to_del_timer_sync(timer);
> if (ret >= 0)
> @@ -1180,19 +1160,27 @@ static inline void __run_timers(struct tvec_base *base)
> while (!list_empty(head)) {
> void (*fn)(unsigned long);
> unsigned long data;
> + bool irqsafe;
>
> timer = list_first_entry(head, struct timer_list,entry);
> fn = timer->function;
> data = timer->data;
> + irqsafe = tbase_get_irqsafe(timer->base);
>
> timer_stats_account_timer(timer);
>
> base->running_timer = timer;
> detach_expired_timer(timer, base);
>
> - spin_unlock_irq(&base->lock);
> - call_timer_fn(timer, fn, data);
> - spin_lock_irq(&base->lock);
> + if (irqsafe) {
> + spin_unlock(&base->lock);
> + call_timer_fn(timer, fn, data);
> + spin_lock(&base->lock);
> + } else {
> + spin_unlock_irq(&base->lock);
> + call_timer_fn(timer, fn, data);
> + spin_lock_irq(&base->lock);
> + }
> }
> }
> base->running_timer = NULL;
> @@ -1791,9 +1779,13 @@ static struct notifier_block __cpuinitdata timers_nb = {
>
> void __init init_timers(void)
> {
> - int err = timer_cpu_notify(&timers_nb, (unsigned long)CPU_UP_PREPARE,
> - (void *)(long)smp_processor_id());
> + int err;
> +
> + /* ensure there are enough low bits for flags in timer->base pointer */
> + BUILD_BUG_ON(__alignof__(struct tvec_base) & TIMER_FLAG_MASK);
>
> + err = timer_cpu_notify(&timers_nb, (unsigned long)CPU_UP_PREPARE,
> + (void *)(long)smp_processor_id());
> init_timer_stats();
>
> BUG_ON(err != NOTIFY_OK);
>
--
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