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Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Pull timer and time updates from Thomas Gleixner:
 "A rather large update of timers, timekeeping & co

   - Core timekeeping code is year-2038 safe now for 32bit machines.
     Now we just need to fix all in kernel users and the gazillion of
     user space interfaces which rely on timespec/timeval :)

   - Better cache layout for the timekeeping internal data structures.

   - Proper nanosecond based interfaces for in kernel users.

   - Tree wide cleanup of code which wants nanoseconds but does hoops
     and loops to convert back and forth from timespecs.  Some of it
     definitely belongs into the ugly code museum.

   - Consolidation of the timekeeping interface zoo.

   - A fast NMI safe accessor to clock monotonic for tracing.  This is a
     long standing request to support correlated user/kernel space
     traces.  With proper NTP frequency correction it's also suitable
     for correlation of traces accross separate machines.

   - Checkpoint/restart support for timerfd.

   - A few NOHZ[_FULL] improvements in the [hr]timer code.

   - Code move from kernel to kernel/time of all time* related code.

   - New clocksource/event drivers from the ARM universe.  I'm really
     impressed that despite an architected timer in the newer chips SoC
     manufacturers insist on inventing new and differently broken SoC
     specific timers.

[ Ed. "Impressed"? I don't think that word means what you think it means ]

   - Another round of code move from arch to drivers.  Looks like most
     of the legacy mess in ARM regarding timers is sorted out except for
     a few obnoxious strongholds.

   - The usual updates and fixlets all over the place"

* 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (114 commits)
  timekeeping: Fixup typo in update_vsyscall_old definition
  clocksource: document some basic timekeeping concepts
  timekeeping: Use cached ntp_tick_length when accumulating error
  timekeeping: Rework frequency adjustments to work better w/ nohz
  timekeeping: Minor fixup for timespec64->timespec assignment
  ftrace: Provide trace clocks monotonic
  timekeeping: Provide fast and NMI safe access to CLOCK_MONOTONIC
  seqcount: Add raw_write_seqcount_latch()
  seqcount: Provide raw_read_seqcount()
  timekeeping: Use tk_read_base as argument for timekeeping_get_ns()
  timekeeping: Create struct tk_read_base and use it in struct timekeeper
  timekeeping: Restructure the timekeeper some more
  clocksource: Get rid of cycle_last
  clocksource: Move cycle_last validation to core code
  clocksource: Make delta calculation a function
  wireless: ath9k: Get rid of timespec conversions
  drm: vmwgfx: Use nsec based interfaces
  drm: i915: Use nsec based interfaces
  timekeeping: Provide ktime_get_raw()
  hangcheck-timer: Use ktime_get_ns()
  ...
This commit is contained in:
Linus Torvalds 2014-08-05 17:46:42 -07:00
commit e7fda6c4c3
108 changed files with 3221 additions and 1923 deletions
Download patch file Download diff file Expand all files Collapse all files

13
arch/tile/kernel/time.c
View file

@ -260,9 +260,8 @@ void update_vsyscall_tz(void)
void update_vsyscall(struct timekeeper *tk)
{
struct timespec wall_time = tk_xtime(tk);
struct timespec *wtm = &tk->wall_to_monotonic;
struct clocksource *clock = tk->clock;
struct clocksource *clock = tk->tkr.clock;
if (clock != &cycle_counter_cs)
return;
@ -270,13 +269,13 @@ void update_vsyscall(struct timekeeper *tk)
/* Userspace gettimeofday will spin while this value is odd. */
++vdso_data->tb_update_count;
smp_wmb();
vdso_data->xtime_tod_stamp = clock->cycle_last;
vdso_data->xtime_clock_sec = wall_time.tv_sec;
vdso_data->xtime_clock_nsec = wall_time.tv_nsec;
vdso_data->xtime_tod_stamp = tk->tkr.cycle_last;
vdso_data->xtime_clock_sec = tk->xtime_sec;
vdso_data->xtime_clock_nsec = tk->tkr.xtime_nsec;
vdso_data->wtom_clock_sec = wtm->tv_sec;
vdso_data->wtom_clock_nsec = wtm->tv_nsec;
vdso_data->mult = clock->mult;
vdso_data->shift = clock->shift;
vdso_data->mult = tk->tkr.mult;
vdso_data->shift = tk->tkr.shift;
smp_wmb();
++vdso_data->tb_update_count;
}

7
arch/tile/kernel/vdso/vgettimeofday.c
View file

@ -83,10 +83,11 @@ int __vdso_gettimeofday(struct timeval *tv, struct timezone *tz)
if (count & 1)
continue;
cycles = (get_cycles() - vdso_data->xtime_tod_stamp);
ns = (cycles * vdso_data->mult) >> vdso_data->shift;
sec = vdso_data->xtime_clock_sec;
ns += vdso_data->xtime_clock_nsec;
cycles = get_cycles() - vdso_data->xtime_tod_stamp;
ns = (cycles * vdso_data->mult) + vdso_data->xtime_clock_nsec;
ns >>= vdso_data->shift;
if (ns >= NSEC_PER_SEC) {
ns -= NSEC_PER_SEC;
sec += 1;