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  1. 16 Sep, 2007 7 commits
    • Thomas Gleixner's avatar
      clockevents: prevent stale tick update on offline cpu · 5e41d0d6
      Thomas Gleixner authored 
      Taking a cpu offline removes the cpu from the online mask before the
CPU_DEAD notification is done. The clock events layer does the cleanup
of the dead CPU from the CPU_DEAD notifier chain. tick_do_timer_cpu is
used to avoid xtime lock contention by assigning the task of jiffies
xtime updates to one CPU. If a CPU is taken offline, then this
assignment becomes stale. This went unnoticed because most of the time
the offline CPU went dead before the online CPU reached __cpu_die(),
where the CPU_DEAD state is checked. In the case that the offline CPU did
not reach the DEAD state before we reach __cpu_die(), the code in there
goes to sleep for 100ms. Due to the stale time update assignment, the
system is stuck forever.

Take the assignment away when a cpu is not longer in the cpu_online_mask.
We do this in the last call to tick_nohz_stop_sched_tick() when the offline
CPU is on the way to the final play_dead() idle entry.
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
      5e41d0d6
    • Thomas Gleixner's avatar
      clockevents: do not shutdown the oneshot broadcast device · 31d9b393
      Thomas Gleixner authored 
      When a cpu goes offline it is removed from the broadcast masks. If the
mask becomes empty the code shuts down the broadcast device. This is
wrong, because the broadcast device needs to be ready for the online
cpu going idle (into a c-state, which stops the local apic timer).
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
      31d9b393
    • Thomas Gleixner's avatar
      clockevents: Enforce oneshot broadcast when broadcast mask is set on resume · 07eec6af
      Thomas Gleixner authored 
      The jinxed VAIO refuses to resume without hitting keys on the keyboard
when this is not enforced. It is unclear why the cpu ends up in a lower
C State without notifying the clock events layer, but enforcing the
oneshot broadcast here is safe.
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
      07eec6af
    • Venkatesh Pallipadi's avatar
      ACPI: Reevaluate C/P/T states when a cpu becomes online · 729c6ba3
      Venkatesh Pallipadi authored 
      Reevaluate C/P/T states when a cpu becomes online. This avoids
the caching of the broadcast information in the clockevents layer.
Signed-off-by: default avatarVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Cc: Len Brown <len.brown@intel.com>
      729c6ba3
    • Thomas Gleixner's avatar
      timekeeping: Prevent time going backwards on resume · 6a669ee8
      Thomas Gleixner authored 
      Timekeeping resume adjusts xtime by adding the slept time in seconds and
resets the reference value of the clock source (clock->cycle_last).
clock->cycle last is used to calculate the delta between the last xtime
update and the readout of the clock source in __get_nsec_offset(). xtime
plus the offset is the current time. The resume code ignores the delta
which had already elapsed between the last xtime update and the actual
time of suspend. If the suspend time is short, then we can see time
going backwards on resume.

Suspend:
offs_s = clock->read() - clock->cycle_last;
now = xtime + offs_s;
timekeeping_suspend_time = read_rtc();

Resume:
sleep_time = read_rtc() - timekeeping_suspend_time;
xtime.tv_sec += sleep_time;
clock->cycle_last = clock->read();
offs_r = clock->read() - clock->cycle_last;
now = xtime + offs_r;

if sleep_time_seconds == 0 and offs_r < offs_s, then time goes
backwards.

Fix this by storing the offset from the last xtime update and add it to
xtime during resume, when we reset clock->cycle_last:

sleep_time = read_rtc() - timekeeping_suspend_time;
xtime.tv_sec += sleep_time;
xtime += offs_s;	/* Fixup xtime offset at suspend time */
clock->cycle_last = clock->read();
offs_r = clock->read() - clock->cycle_last;
now = xtime + offs_r;

Thanks to Marcelo for tracking this down on the OLPC and providing the
necessary details to analyze the root cause.
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Cc: John Stultz <johnstul@us.ibm.com>
Cc: Tosatti <marcelo@kvack.org>
      6a669ee8
    • Thomas Gleixner's avatar
      timekeeping: access rtc outside of xtime lock · 3be90950
      Thomas Gleixner authored 
      Lockdep complains about the access of rtc in timekeeping_suspend
inside the interrupt disabled region of the write locked xtime lock.
Move the access outside.
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Cc: John Stultz <johnstul@us.ibm.com>
      3be90950
    • Linus Torvalds's avatar
      Merge branch 'upstream-linus' of master.kernel.org:/pub/scm/linux/kernel/git/jgarzik/netdev-2.6 · d0174640
      Linus Torvalds authored 
      * 'upstream-linus' of master.kernel.org:/pub/scm/linux/kernel/git/jgarzik/netdev-2.6:
  drivers/net/pcmcia/3c589_cs: fix port configuration switcheroo
  sk98lin: resurrect driver
  ucc_geth: fix compilation
  mv643xx_eth: Fix tx_bytes stats calculation
  As struct iw_point is bi-directional payload, we should copy back the content
  [PATCH] bcm43xx: Fix cancellation of work queue crashes
  spidernet: fix interrupt reason recognition
  ehea: fix last_rx update
  ehea: propagate physical port state
  Fix a lock problem in generic phy code
  sky2: restore multicast list on resume and other ops
  atl1: disable broken 64-bit DMA
      d0174640
  3. 15 Sep, 2007 7 commits
  5. 14 Sep, 2007 25 commits
  7. 13 Sep, 2007 1 commit
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