1. 23 3月, 2013 5 次提交
  2. 16 3月, 2013 1 次提交
    • F
      timekeeping: utilize the suspend-nonstop clocksource to count suspended time · e445cf1c
      Feng Tang 提交于
      There are some new processors whose TSC clocksource won't stop during
      suspend. Currently, after system resumes, kernel will use persistent
      clock or RTC to compensate the sleep time, but with these nonstop
      clocksources, we could skip the special compensation from external
      sources, and just use current clocksource for time recounting.
      
      This can solve some time drift bugs caused by some not-so-accurate or
      error-prone RTC devices.
      
      The current way to count suspended time is first try to use the persistent
      clock, and then try the RTC if persistent clock can't be used. This
      patch will change the trying order to:
      	suspend-nonstop clocksource -> persistent clock -> RTC
      
      When counting the sleep time with nonstop clocksource, use an accurate way
      suggested by Jason Gunthorpe to cover very large delta cycles.
      Signed-off-by: NFeng Tang <feng.tang@intel.com>
      [jstultz: Small optimization, avoiding re-reading the clocksource]
      Signed-off-by: NJohn Stultz <john.stultz@linaro.org>
      e445cf1c
  3. 16 1月, 2013 2 次提交
  4. 25 12月, 2012 1 次提交
    • S
      time: convert arch_gettimeoffset to a pointer · 7b1f6207
      Stephen Warren 提交于
      Currently, whenever CONFIG_ARCH_USES_GETTIMEOFFSET is enabled, each
      arch core provides a single implementation of arch_gettimeoffset(). In
      many cases, different sub-architectures, different machines, or
      different timer providers exist, and so the arch ends up implementing
      arch_gettimeoffset() as a call-through-pointer anyway. Examples are
      ARM, Cris, M68K, and it's arguable that the remaining architectures,
      M32R and Blackfin, should be doing this anyway.
      
      Modify arch_gettimeoffset so that it itself is a function pointer, which
      the arch initializes. This will allow later changes to move the
      initialization of this function into individual machine support or timer
      drivers. This is particularly useful for code in drivers/clocksource
      which should rely on an arch-independant mechanism to register their
      implementation of arch_gettimeoffset().
      
      This patch also converts the Cris architecture to set arch_gettimeoffset
      directly to the final implementation in time_init(), because Cris already
      had separate time_init() functions per sub-architecture. M68K and ARM
      are converted to set arch_gettimeoffset to the final implementation in
      later patches, because they already have function pointers in place for
      this purpose.
      
      Cc: Russell King <linux@arm.linux.org.uk>
      Cc: Mike Frysinger <vapier@gentoo.org>
      Cc: Mikael Starvik <starvik@axis.com>
      Cc: Hirokazu Takata <takata@linux-m32r.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Acked-by: NGeert Uytterhoeven <geert@linux-m68k.org>
      Acked-by: NJesper Nilsson <jesper.nilsson@axis.com>
      Acked-by: NJohn Stultz <johnstul@us.ibm.com>
      Signed-off-by: NStephen Warren <swarren@nvidia.com>
      7b1f6207
  5. 28 11月, 2012 1 次提交
  6. 14 11月, 2012 1 次提交
  7. 10 10月, 2012 1 次提交
  8. 25 9月, 2012 4 次提交
    • J
      time: Only do nanosecond rounding on GENERIC_TIME_VSYSCALL_OLD systems · 92bb1fcf
      John Stultz 提交于
      We only do rounding to the next nanosecond so we don't see minor
      1ns inconsistencies in the vsyscall implementations. Since we're
      changing the vsyscall implementations to avoid this, conditionalize
      the rounding only to the GENERIC_TIME_VSYSCALL_OLD architectures.
      
      Cc: Tony Luck <tony.luck@intel.com>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
      Cc: Andy Lutomirski <luto@amacapital.net>
      Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
      Cc: Paul Turner <pjt@google.com>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: Richard Cochran <richardcochran@gmail.com>
      Cc: Prarit Bhargava <prarit@redhat.com>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Signed-off-by: NJohn Stultz <john.stultz@linaro.org>
      92bb1fcf
    • J
      time: Introduce new GENERIC_TIME_VSYSCALL · 576094b7
      John Stultz 提交于
      Now that we moved everyone over to GENERIC_TIME_VSYSCALL_OLD,
      introduce the new declaration and config option for the new
      update_vsyscall method.
      
      Cc: Tony Luck <tony.luck@intel.com>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
      Cc: Andy Lutomirski <luto@amacapital.net>
      Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
      Cc: Paul Turner <pjt@google.com>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: Richard Cochran <richardcochran@gmail.com>
      Cc: Prarit Bhargava <prarit@redhat.com>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Signed-off-by: NJohn Stultz <john.stultz@linaro.org>
      576094b7
    • J
      time: Convert CONFIG_GENERIC_TIME_VSYSCALL to CONFIG_GENERIC_TIME_VSYSCALL_OLD · 70639421
      John Stultz 提交于
      To help migrate archtectures over to the new update_vsyscall method,
      redfine CONFIG_GENERIC_TIME_VSYSCALL as CONFIG_GENERIC_TIME_VSYSCALL_OLD
      
      Cc: Tony Luck <tony.luck@intel.com>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
      Cc: Andy Lutomirski <luto@amacapital.net>
      Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
      Cc: Paul Turner <pjt@google.com>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: Richard Cochran <richardcochran@gmail.com>
      Cc: Prarit Bhargava <prarit@redhat.com>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Signed-off-by: NJohn Stultz <john.stultz@linaro.org>
      70639421
    • J
      time: Move timekeeper structure to timekeeper_internal.h for vsyscall changes · d7b4202e
      John Stultz 提交于
      We're going to need to access the timekeeper in update_vsyscall,
      so make the structure available for those who need it.
      
      Cc: Tony Luck <tony.luck@intel.com>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
      Cc: Andy Lutomirski <luto@amacapital.net>
      Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
      Cc: Paul Turner <pjt@google.com>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: Richard Cochran <richardcochran@gmail.com>
      Cc: Prarit Bhargava <prarit@redhat.com>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Signed-off-by: NJohn Stultz <john.stultz@linaro.org>
      d7b4202e
  9. 13 9月, 2012 1 次提交
  10. 04 9月, 2012 1 次提交
    • R
      timekeeping: Add suspend and resume of clock event devices · adc78e6b
      Rafael J. Wysocki 提交于
      Some clock event devices, for example such that belong to PM domains,
      need to be handled in a spcial way during the timekeeping suspend
      and resume (which takes place in the system core, or "syscore",
      stages of system power transitions) in analogy with clock sources.
      
      Introduce .suspend() and .resume() callbacks for clock event devices
      that will be executed by timekeeping_suspend/_resume(), respectively,
      next the the clock sources' .suspend() and .resume() callbacks.
      Signed-off-by: NRafael J. Wysocki <rjw@sisk.pl>
      adc78e6b
  11. 02 9月, 2012 1 次提交
    • J
      time: Move ktime_t overflow checking into timespec_valid_strict · cee58483
      John Stultz 提交于
      Andreas Bombe reported that the added ktime_t overflow checking added to
      timespec_valid in commit 4e8b1452 ("time: Improve sanity checking of
      timekeeping inputs") was causing problems with X.org because it caused
      timeouts larger then KTIME_T to be invalid.
      
      Previously, these large timeouts would be clamped to KTIME_MAX and would
      never expire, which is valid.
      
      This patch splits the ktime_t overflow checking into a new
      timespec_valid_strict function, and converts the timekeeping codes
      internal checking to use this more strict function.
      Reported-and-tested-by: NAndreas Bombe <aeb@debian.org>
      Cc: Zhouping Liu <zliu@redhat.com>
      Cc: Ingo Molnar <mingo@kernel.org>
      Cc: Prarit Bhargava <prarit@redhat.com>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: stable@vger.kernel.org
      Signed-off-by: NJohn Stultz <john.stultz@linaro.org>
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      cee58483
  12. 22 8月, 2012 4 次提交
  13. 15 8月, 2012 1 次提交
  14. 05 8月, 2012 1 次提交
    • I
      time: Fix adjustment cleanup bug in timekeeping_adjust() · 1d17d174
      Ingo Molnar 提交于
      Tetsuo Handa reported that sporadically the system clock starts
      counting up too quickly which is enough to confuse the hangcheck
      timer to print a bogus stall warning.
      
      Commit 2a8c0883 "time: Move xtime_nsec adjustment underflow handling
      timekeeping_adjust" overlooked this exit path:
      
              } else
                      return;
      
      which should really be a proper exit sequence, fixing the bug as a
      side effect.
      
      Also make the flow more readable by properly balancing curly
      braces.
      
      Reported-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> wrote:
      Tested-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> wrote:
      Signed-off-by: NIngo Molnar <mingo@kernel.org>
      Cc: john.stultz@linaro.org
      Cc: a.p.zijlstra@chello.nl
      Cc: richardcochran@gmail.com
      Cc: prarit@redhat.com
      Link: http://lkml.kernel.org/r/20120804192114.GA28347@gmail.comSigned-off-by: NIngo Molnar <mingo@kernel.org>
      1d17d174
  15. 31 7月, 2012 3 次提交
  16. 24 7月, 2012 1 次提交
  17. 17 7月, 2012 1 次提交
  18. 15 7月, 2012 7 次提交
  19. 12 7月, 2012 3 次提交