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2013-06-28hrtimers: Support resuming with two or more CPUs online (but stopped)David Vrabel1-3/+12
hrtimers_resume() only reprograms the timers for the current CPU as it assumes that all other CPUs are offline at this point in the resume process. If other CPUs are online then their timers will not be corrected and they may fire at the wrong time. When running as a Xen guest, this assumption is not true. Non-boot CPUs are only stopped with IRQs disabled instead of offlining them. This is a performance optimization as disabling the CPUs would add an unacceptable amount of additional downtime during a live migration (> 200 ms for a 4 VCPU guest). hrtimers_resume() cannot call on_each_cpu(retrigger_next_event,...) as the other CPUs will be stopped with IRQs disabled. Instead, defer the call to the next softirq. [ tglx: Separated the xen change out ] Signed-off-by: David Vrabel <david.vrabel@citrix.com> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: John Stultz <john.stultz@linaro.org> Cc: <xen-devel@lists.xen.org> Link: http://lkml.kernel.org/r/1372329348-20841-2-git-send-email-david.vrabel@citrix.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-06-28timer: Fix jiffies wrap behavior of round_jiffies_common()Bart Van Assche1-3/+5
Direct compare of jiffies related values does not work in the wrap around case. Replace it with time_is_after_jiffies(). Signed-off-by: Bart Van Assche <bvanassche@acm.org> Cc: Arjan van de Ven <arjan@infradead.org> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Link: http://lkml.kernel.org/r/519BC066.5080600@acm.org Cc: stable@vger.kernel.org Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-06-25clocksource: vf_pit_timer: Use linux/sched_clock.hFabio Estevam1-1/+1
Commit 38ff87f7 (sched_clock: Make ARM's sched_clock generic for all architectures) changed the header to <linux/sched_clock.h>, so adapt it in order to fix the following build error: drivers/clocksource/vf_pit_timer.c:15:29: fatal error: asm/sched_clock.h: No such file or directory Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com> Cc: shawn.guo@linaro.org Cc: sboyd@codeaurora.org Cc: john.stultz@linaro.org Link: http://lkml.kernel.org/r/1372116008-2323-1-git-send-email-festevam@gmail.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-06-25Merge branch 'fortglx/3.11/time' of ↵Thomas Gleixner1-0/+4
git://git.linaro.org/people/jstultz/linux into timers/core
2013-06-24clocksource: Add generic dummy timer driverMark Rutland2-0/+70
Several architectures have a dummy timer driver tightly coupled with their broadcast code to support machines without cpu-local timers (or where there is a lack of driver support). Since 12ad100046: "clockevents: Add generic timer broadcast function" it's been possible to write broadcast-capable timer drivers decoupled from the broadcast mechanism. We can use this functionality to implement a generic dummy timer driver that can be shared by all architectures with generic tick broadcast (ARCH_HAS_TICK_BROADCAST). This patch implements a generic dummy timer using this facility. [sboyd: Make percpu data static, use __this_cpu_ptr(), move to early_initcall to properly register on each CPU, only register if more than one CPU possible] Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> Acked-by: Marc Zyngier <marc.zyngier@arm.com>, Cc: John Stultz <john.stultz@linaro.org> Cc: Daniel Lezcano <daniel.lezcano@linaro.org> Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/1370291642-13259-3-git-send-email-sboyd@codeaurora.org Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-06-24clockevents: Prefer CPU local devices over global devicesStephen Boyd1-2/+7
On an SMP system with only one global clockevent and a dummy clockevent per CPU we run into problems. We want the dummy clockevents to be registered as the per CPU tick devices, but we can only achieve that if we register the dummy clockevents before the global clockevent or if we artificially inflate the rating of the dummy clockevents to be higher than the rating of the global clockevent. Failure to do so leads to boot hangs when the dummy timers are registered on all other CPUs besides the CPU that accepted the global clockevent as its tick device and there is no broadcast timer to poke the dummy devices. If we're registering multiple clockevents and one clockevent is global and the other is local to a particular CPU we should choose to use the local clockevent regardless of the rating of the device. This way, if the clockevent is a dummy it will take the tick device duty as long as there isn't a higher rated tick device and any global clockevent will be bumped out into broadcast mode, fixing the problem described above. Reported-and-tested-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> Tested-by: soren.brinkmann@xilinx.com Cc: John Stultz <john.stultz@linaro.org> Cc: Daniel Lezcano <daniel.lezcano@linaro.org> Cc: linux-arm-kernel@lists.infradead.org Cc: John Stultz <john.stultz@linaro.org> Link: http://lkml.kernel.org/r/20130613183950.GA32061@codeaurora.org Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-06-21sched_clock: Add temporary asm/sched_clock.hStephen Boyd1-0/+4
Some new users of the ARM sched_clock framework are going through the arm-soc tree. Before 38ff87f (sched_clock: Make ARM's sched_clock generic for all architectures, 2013-06-01) the header file was in asm, but now it's in linux. One solution would be to do an evil merge of the arm-soc tree and fix up the asm users, but it's easier to add a temporary asm header that we can remove along with the few stragglers after the merge window is over. Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> Signed-off-by: John Stultz <john.stultz@linaro.org>
2013-06-18Revert "dw_apb_timer_of.c: Remove parts that were picoxcell-specific"John Stultz4-29/+37
This reverts commit 55a68c23e0a675b2b8ac2656fd6edbf98b78e4c6. In order to avoid a collision with dw_apb_timer changes in the arm-soc tree, revert this change. I'm leaving it to the arm-soc folks to sort out if they want to keep the other side of the collision or if they're just going to back it all out and try again during the next release cycle. Reported-by: Dinh Nguyen <dinguyen@altera.com> Signed-off-by: John Stultz <john.stultz@linaro.org>
2013-06-17ARM: sched_clock: Load cycle count after epoch stabilizesStephen Boyd1-11/+8
There is a small race between when the cycle count is read from the hardware and when the epoch stabilizes. Consider this scenario: CPU0 CPU1 ---- ---- cyc = read_sched_clock() cyc_to_sched_clock() update_sched_clock() ... cd.epoch_cyc = cyc; epoch_cyc = cd.epoch_cyc; ... epoch_ns + cyc_to_ns((cyc - epoch_cyc) The cyc on cpu0 was read before the epoch changed. But we calculate the nanoseconds based on the new epoch by subtracting the new epoch from the old cycle count. Since epoch is most likely larger than the old cycle count we calculate a large number that will be converted to nanoseconds and added to epoch_ns, causing time to jump forward too much. Fix this problem by reading the hardware after the epoch has stabilized. Cc: Russell King <linux@arm.linux.org.uk> Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> Signed-off-by: John Stultz <john.stultz@linaro.org>
2013-06-12sched_clock: Make ARM's sched_clock generic for all architecturesStephen Boyd36-38/+45
Nothing about the sched_clock implementation in the ARM port is specific to the architecture. Generalize the code so that other architectures can use it by selecting GENERIC_SCHED_CLOCK. Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> [jstultz: Merge minor collisions with other patches in my tree] Signed-off-by: John Stultz <john.stultz@linaro.org>
2013-06-12ARM: sched_clock: Return suspended count earlierStephen Boyd1-3/+3
If we're suspended and sched_clock() is called we're going to read the hardware one more time and throw away that value and return back the cached value we saved during the suspend callback. This is wasteful. Let's short circuit all that and return the cached value as early as possible if we're suspended. Acked-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> Signed-off-by: John Stultz <john.stultz@linaro.org>
2013-06-12ARM: sched_clock: Remove unused needs_suspend memberStephen Boyd1-1/+0
The needs_suspend member is unused now that we always do the suspend/resume handling (see 6a4dae5 (ARM: 7565/1: sched: stop sched_clock() during suspend, 2012-10-23)). Acked-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> Signed-off-by: John Stultz <john.stultz@linaro.org>
2013-06-12alarmtimer: Export symbols of functions declared in linux/alarmtimer.hMarcus Gelderie1-1/+9
Export symbols so they can be used by drivers/staging/android/alarm-dev.c if it is built as a module. So far alarm-dev is built-in but module support is planned (see drivers/staging/android/TODO). Signed-off-by: Marcus Gelderie <redmnic@gmail.com> [jstultz: tweaked commit message, also export newly added functions] Signed-off-by: John Stultz <john.stultz@linaro.org>
2013-06-08Merge branch 'timers/clockevents' of ↵Thomas Gleixner6-1/+450
git://git.linaro.org/people/dlezcano/clockevents into timers/core
2013-06-06clocksource: Add TI-Nspire timer supportDaniel Tang3-0/+249
This patch adds a clocksource/clockevent driver for the timer found on some models in the TI-Nspire calculator series. The timer has two 16bit subtimers within its memory mapped I/O interface but only the first can generate interrupts. The first subtimer is used to generate clockevents but only if an interrupt number and register is given. The interrupt acknowledgement mechanism is a little strange because the interrupt mask and acknowledge registers are located in another memory mapped I/O peripheral. The address of this register is passed to the driver through device tree bindings. The second subtimer is used as a clocksource because it isn't capable of generating an interrupt. This subtimer is always added. Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Daniel Tang <dt.tangr@gmail.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2013-06-06clocksource: Add Freescale Vybrid pit timer supportJingchang Lu3-0/+200
Add Freescale Vybrid Family period interrupt timer support. Signed-off-by: Jingchang Lu <b35083@freescale.com> Reviewed-by: Daniel Lezcano <daniel.lezcano@linaro.org> Acked-by: Shawn Guo <shawn.guo@linaro.org> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2013-06-06clocksource: dw_apb: Fix error checkBaruch Siach1-1/+1
irq_of_parse_and_map() returns 0 on error, while the code checks for NO_IRQ. This breaks on platforms that have NO_IRQ != 0. Cc: <stable@vger.kernel.org> Signed-off-by: Baruch Siach <baruch@tkos.co.il> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2013-05-29x86: Fix vrtc_get_time/set_mmss to use new timespec interfaceJohn Stultz2-7/+8
The patch "x86: Increase precision of x86_platform.get/set_wallclock" changed the x86 platform set_wallclock/get_wallclock interfaces to use nsec granular timespecs instead of a second granular interface. However, that patch missed converting the vrtc code, so this patch converts those functions to use timespecs. Many thanks to the kbuild test robot for finding this! Reported-by: kbuild test robot <fengguang.wu@intel.com> Signed-off-by: John Stultz <john.stultz@linaro.org>
2013-05-29power: Add option to log time spent in suspendColin Cross4-0/+89
Below is a patch from android kernel that maintains a histogram of suspend times. Please review and provide feedback. Statistices on the time spent in suspend are kept in /sys/kernel/debug/sleep_time. Cc: Android Kernel Team <kernel-team@android.com> Cc: Colin Cross <ccross@android.com> Cc: Todd Poynor <toddpoynor@google.com> Cc: San Mehat <san@google.com> Cc: Benoit Goby <benoit@android.com> Cc: John Stultz <john.stultz@linaro.org> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Colin Cross <ccross@android.com> Signed-off-by: Todd Poynor <toddpoynor@google.com> [zoran.markovic@linaro.org: Re-formatted suspend time table to better fit expected values. Moved accounting of suspend time into timekeeping core. Removed CONFIG_SUSPEND_TIME flag and made the feature conditional on CONFIG_DEBUG_FS. Changed the file name to sleep_time to better fit terminology in timekeeping core. Changed seq_printf to seq_puts. Tweaked commit message] Signed-off-by: Zoran Markovic <zoran.markovic@linaro.org> Signed-off-by: John Stultz <john.stultz@linaro.org>
2013-05-29timerfd: Add alarm timersTodd Poynor1-23/+108
Add support for clocks CLOCK_REALTIME_ALARM and CLOCK_BOOTTIME_ALARM, thereby enabling wakeup alarm timers via file descriptors. Signed-off-by: Todd Poynor <toddpoynor@google.com> Signed-off-by: John Stultz <john.stultz@linaro.org>
2013-05-29alarmtimer: Add functions for timerfd supportTodd Poynor2-1/+42
Add functions needed for hooking up alarmtimer to timerfd: * alarm_restart: Similar to hrtimer_restart, restart an alarmtimer after the expires time has already been updated (as with alarm_forward). * alarm_forward_now: Similar to hrtimer_forward_now, move the expires time forward to an interval from the current time of the associated clock. * alarm_start_relative: Start an alarmtimer with an expires time relative to the current time of the associated clock. * alarm_expires_remaining: Similar to hrtimer_expires_remaining, return the amount of time remaining until alarm expiry. Signed-off-by: Todd Poynor <toddpoynor@google.com> Signed-off-by: John Stultz <john.stultz@linaro.org>
2013-05-28x86: Increase precision of x86_platform.get/set_wallclock()David Vrabel8-41/+32
All the virtualized platforms (KVM, lguest and Xen) have persistent wallclocks that have more than one second of precision. read_persistent_wallclock() and update_persistent_wallclock() allow for nanosecond precision but their implementation on x86 with x86_platform.get/set_wallclock() only allows for one second precision. This means guests may see a wallclock time that is off by up to 1 second. Make set_wallclock() and get_wallclock() take a struct timespec parameter (which allows for nanosecond precision) so KVM and Xen guests may start with a more accurate wallclock time and a Xen dom0 can maintain a more accurate wallclock for guests. Signed-off-by: David Vrabel <david.vrabel@citrix.com> Signed-off-by: John Stultz <john.stultz@linaro.org>
2013-05-28clocksource: dw_apb: Remove unused headerBaruch Siach1-1/+0
The time.h header seems not to be used by current code. Removing this include allows the driver to build on other architecture that do not have this header. Cc: Ingo Molnar <mingo@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: John Stultz <john.stultz@linaro.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Jamie Iles <jamie@jamieiles.com> Cc: Dinh Nguyen <dinguyen@altera.com> Acked-by: Jamie Iles <jamie@jamieiles.com> Signed-off-by: Baruch Siach <baruch@tkos.co.il> [tweaked commit message and header] Signed-off-by: John Stultz <john.stultz@linaro.org>
2013-05-28dw_apb_timer_of.c: Remove parts that were picoxcell-specificPavel Machek4-37/+29
It seems we made a mistake when creating dw_apb_timer_of.c: picoxcell sched_clock had parts that were not related to dw_apb_timer, yet we moved them to dw_apb_timer_of, and tried to use them on socfpga. This results in system where user/system time is not measured properly, as demonstrated by time dd if=/dev/urandom of=/dev/zero bs=100000 count=100 So this patch switches sched_clock to hardware that exists on both platforms, and adds missing of_node_put() in dw_apb_timer_init(). Signed-off-by: Pavel Machek <pavel@denx.de> Acked-by: Jamie Iles <jamie@jamieiles.com> Signed-off-by: John Stultz <john.stultz@linaro.org>
2013-05-28ktime: Add __must_check prefix to ktime_to_timespec_condDaniel Borkmann1-1/+2
The function is currently mainly used in the networking code and if others start using it, they must check the result, otherwise it cannot be determined if the timespec conversion suceeded. Currently no user lacks this check, but make future users aware of a possible misusage. Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Signed-off-by: John Stultz <john.stultz@linaro.org>
2013-05-28ktime: Use macro NSEC_PER_USEC where appropriateLiu Ying1-3/+4
We've got the macro NSEC_PER_USEC defined in header file include/linux/time.h. To make the code decent, this patch replaces the immediate number 1000 to convert bewteen a time value in microseconds and one in nanoseconds with the macro NSEC_PER_USEC. Signed-off-by: Liu Ying <Ying.Liu@freescale.com> Cc: David S. Miller <davem@davemloft.net> Cc: Daniel Borkmann <dborkman@redhat.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: John Stultz <john.stultz@linaro.org> Signed-off-by: John Stultz <john.stultz@linaro.org>
2013-05-28clocksource: Implement clocksource_select_fallback() for ↵Thomas Gleixner1-0/+1
CONFIG_ARCH_USES_GETTIMEOFFSET=y commit 7eaeb34305 (clocksource: Provide unbind interface in sysfs) implemented clocksource_select_fallback() which is not defined for CONFIG_ARCH_USES_GETTIMEOFFSET=y. Add an empty inline function for that. Reported-by: Ingo Molnar <mingo@kernel.org> Reported-by: fengguang.wu@intel.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-28clockevents: Define CS_NAME_LEN unconditionallyThomas Gleixner1-2/+2
Unbreak architectures which do not use clockevents, but require to build some of the core timekeeping infrastructure Reported-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-16clockevents: Implement unbind functionalityThomas Gleixner5-4/+162
Provide a sysfs interface to allow unbinding of clockevent devices. The device is unbound if it is unused or if there is a replacement device available. Unbinding of broadcast devices is not supported as we don't want to foster that nonsense. If no replacement device is available the unbind returns -EBUSY. Unbind is available from the kernel and through sysfs, which is necessary to drop the module refcount. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: John Stultz <john.stultz@linaro.org> Cc: Magnus Damm <magnus.damm@gmail.com> Link: http://lkml.kernel.org/r/20130425143436.499216659@linutronix.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-16clockevents: Split out selection logicThomas Gleixner2-38/+56
Split out the clockevent device selection logic. Preparatory patch to allow unbinding active clockevent devices. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: John Stultz <john.stultz@linaro.org> Cc: Magnus Damm <magnus.damm@gmail.com> Link: http://lkml.kernel.org/r/20130425143436.431796247@linutronix.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-16clockevents: Provide sysfs interfaceThomas Gleixner1-0/+86
Provide a simple sysfs interface for the clockevent devices. Show the current active clockevent device. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: John Stultz <john.stultz@linaro.org> Cc: Magnus Damm <magnus.damm@gmail.com> Link: http://lkml.kernel.org/r/20130425143436.371634778@linutronix.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-16clockevents: Add module refcountThomas Gleixner4-0/+11
We want to be able to remove clockevent modules as well. Add a refcount so we don't remove a module with an active clock event device. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: John Stultz <john.stultz@linaro.org> Cc: Magnus Damm <magnus.damm@gmail.com> Link: http://lkml.kernel.org/r/20130425143436.307435149@linutronix.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-16clockevents: Move the tick_notify() switch case to clockevents_notify()Thomas Gleixner3-48/+35
No need to call another function and have duplicated cases. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: John Stultz <john.stultz@linaro.org> Cc: Magnus Damm <magnus.damm@gmail.com> Link: http://lkml.kernel.org/r/20130425143436.235746557@linutronix.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-16clockevents: Simplify lockingThomas Gleixner1-17/+5
Now that the notifier chain is gone there are no other users and it's pointless to nest tick_device_lock inside of clockevents_lock because there is no other use case. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: John Stultz <john.stultz@linaro.org> Cc: Magnus Damm <magnus.damm@gmail.com> Link: http://lkml.kernel.org/r/20130425143436.162888472@linutronix.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-16clockevents: Get rid of the notifier chainThomas Gleixner5-64/+14
7+ years and still a single user. Kill it. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: John Stultz <john.stultz@linaro.org> Cc: Magnus Damm <magnus.damm@gmail.com> Link: http://lkml.kernel.org/r/20130425143436.098520211@linutronix.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-16clocksource: Let clocksource_unregister() return success/errorThomas Gleixner2-22/+13
The unregister call can fail, if the clocksource is the current one and there is no replacement clocksource available. It can also fail, if the clocksource is the watchdog clocksource and I'm not going to provide support for this. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: John Stultz <john.stultz@linaro.org> Cc: Magnus Damm <magnus.damm@gmail.com> Link: http://lkml.kernel.org/r/20130425143436.029915527@linutronix.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-16clocksource: Provide unbind interface in sysfsThomas Gleixner1-0/+73
With the module refcount held for the current clocksource there is no way to unload the module. Provide a sysfs interface which allows to unbind the clocksource. One could argue that the clocksource override could be (ab)used to do so, but the clocksource override cannot be used from the kernel itself, while an unbind function can be used to programmatically check whether a clocksource can be shutdown or not. The unbind functionality uses the new skip current feature of clocksource_select and verifies that a fallback clocksource has been installed. If the clocksource which should be unbound is the current clocksource and no fallback can be found, unbind returns -EBUSY. This does not support the unbinding of a clocksource which is used as the watchdog clocksource. No point in fostering crappy hardware. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: John Stultz <john.stultz@linaro.org> Cc: Magnus Damm <magnus.damm@gmail.com> Link: http://lkml.kernel.org/r/20130425143435.964218245@linutronix.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-16clocksource: Split out user string inputThomas Gleixner1-14/+23
Split out the user string input for clocksource override. Preparatory patch for unbind. [ jstultz: Fix an off by one error ] Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: John Stultz <john.stultz@linaro.org> Cc: Magnus Damm <magnus.damm@gmail.com> Link: http://lkml.kernel.org/r/20130425143435.895851338@linutronix.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-16clocksource: Allow clocksource select to skip current clocksourceThomas Gleixner1-11/+20
Preparatory patch for clocksource unbind support. Split out code from clocksource_select and modify it, so it skips the current clocksource on request and tries to find a fallback clocksource. Convert all existing users. No functional change. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: John Stultz <john.stultz@linaro.org> Cc: Magnus Damm <magnus.damm@gmail.com> Link: http://lkml.kernel.org/r/20130425143435.834965397@linutronix.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-16clocksource: Add module refcountThomas Gleixner2-5/+17
Add a module refcount, so the current clocksource cannot be removed unconditionally. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: John Stultz <john.stultz@linaro.org> Cc: Magnus Damm <magnus.damm@gmail.com> Link: http://lkml.kernel.org/r/20130425143435.762417789@linutronix.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-16clocksource: Let timekeeping_notify return success/errorThomas Gleixner3-6/+7
timekeeping_notify() can fail due cs->enable() failure. Though the caller does not notice and happily keeps the wrong clocksource as the current one. Let the caller know about failure, so the current clocksource will be shown correctly in sysfs. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: John Stultz <john.stultz@linaro.org> Cc: Magnus Damm <magnus.damm@gmail.com> Link: http://lkml.kernel.org/r/20130425143435.696321912@linutronix.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-16clocksource: Always verify highres capabilityThomas Gleixner1-5/+26
If a clocksource has a (wrong) high rating, but can't be used as a timebase for oneshot tick mode, it is unconditionally selected even when the system is already in oneshot tick mode. This causes full system failure. Verify the clocksource selection against the oneshot mode. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: John Stultz <john.stultz@linaro.org> Cc: Magnus Damm <magnus.damm@gmail.com> Link: http://lkml.kernel.org/r/20130425143435.635040849@linutronix.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-16clocksource: apb_timer: Remove unsused functionThomas Gleixner2-13/+0
Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: John Stultz <john.stultz@linaro.org> Cc: Magnus Damm <magnus.damm@gmail.com> Acked-by: Jamie Iles <jamie@jamieiles.com> Link: http://lkml.kernel.org/r/20130425143435.558006195@linutronix.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-15Merge tag 'trace-fixes-v3.10-rc1' of ↵Linus Torvalds2-13/+44
git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace Pull tracing fixes from Steven Rostedt: "This includes a fix to a memory leak when adding filters to traces. Also, Masami Hiramatsu fixed up some minor bugs that were discovered by sparse." * tag 'trace-fixes-v3.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: tracing/kprobes: Make print_*probe_event static tracing/kprobes: Fix a sparse warning for incorrect type in assignment tracing/kprobes: Use rcu_dereference_raw for tp->files tracing: Fix leaks of filter preds
2013-05-15Merge branch 'x86-urgent-for-linus' of ↵Linus Torvalds3-6/+23
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull x86 fixes from Thomas Gleixner: - Fix for a CPU hot-add deadlock in microcode update code - Fix for idle consolidation fallout - Documentation update for initial kernel direct mapping * 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/mm: Add missing comments for initial kernel direct mapping x86/microcode: Add local mutex to fix physical CPU hot-add deadlock x86: Fix idle consolidation fallout
2013-05-15Merge branch 'perf-urgent-for-linus' of ↵Linus Torvalds1-151/+89
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull perf fixes from Thomas Gleixner: - Fix for a task exit cleanup race caused by a missing a preempt disable - Cleanup of the event notification functions with a massive reduction of duplicated code * 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: perf: Factor out auxiliary events notification perf: Fix EXIT event notification
2013-05-15Merge branch 'timers-urgent-for-linus' of ↵Linus Torvalds7-19/+8
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull timer fixes from Thomas Gleixner: - Cure for not using zalloc in the first place, which leads to random crashes with CPUMASK_OFF_STACK. - Revert a user space visible change which broke udev - Add a missing cpu_online early return introduced by the new full dyntick conversions - Plug a long standing race in the timer wheel cpu hotplug code. Sigh... - Cleanup NOHZ per cpu data on cpu down to prevent stale data on cpu up. * 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: time: Revert ALWAYS_USE_PERSISTENT_CLOCK compile time optimizaitons timer: Don't reinitialize the cpu base lock during CPU_UP_PREPARE tick: Don't invoke tick_nohz_stop_sched_tick() if the cpu is offline tick: Cleanup NOHZ per cpu data on cpu down tick: Use zalloc_cpumask_var for allocating offstack cpumasks
2013-05-15Merge branch 'core-urgent-for-linus' of ↵Linus Torvalds3-0/+207
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull core fixes from Thomas Gleixner: - Two fixlets for the fallout of the generic idle task conversion - Documentation update * 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: rcu/idle: Wrap cpu-idle poll mode within rcu_idle_enter/exit idle: Fix hlt/nohlt command-line handling in new generic idle kthread: Document ways of reducing OS jitter due to per-CPU kthreads
2013-05-15Merge branch 'fixes' of git://git.linaro.org/people/rmk/linux-armLinus Torvalds5-11/+14
Pull ARM fixes from Russell King: "A small number of fixes for stuff from the last merge window, and in one case (IRQ time accounting) the previous merge window." * 'fixes' of git://git.linaro.org/people/rmk/linux-arm: ARM: 7720/1: ARM v6/v7 cmpxchg64 shouldn't clear upper 32 bits of the old/new value ARM: 7715/1: MCPM: adapt to GIC changes after upstream merge ARM: 7714/1: mmc: mmci: Ensure return value of regulator_enable() is checked ARM: 7712/1: Remove trailing whitespace in arch/arm/Makefile ARM: 7711/1: dove: fix Dove cpu type from V7 to PJ4 ARM: finally enable IRQ time accounting config
2013-05-15Merge branch 'for-linus' of ↵Linus Torvalds2-387/+553
git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client Pull Ceph fixes from Sage Weil: "Yes, this is a much larger pull than I would like after -rc1. There are a few things included: - a few fixes for leaks and incorrect assertions - a few patches fixing behavior when mapped images are resized - handling for cloned/layered images that are flattened out from underneath the client The last bit was non-trivial, and there is some code movement and associated cleanup mixed in. This was ready and was meant to go in last week but I missed the boat on Friday. My only excuse is that I was waiting for an all clear from the testing and there were many other shiny things to distract me. Strictly speaking, handling the flatten case isn't a regression and could wait, so if you like we can try to pull the series apart, but Alex and I would much prefer to have it all in as it is a case real users will hit with 3.10." * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client: (33 commits) rbd: re-submit flattened write request (part 2) rbd: re-submit write request for flattened clone rbd: re-submit read request for flattened clone rbd: detect when clone image is flattened rbd: reference count parent requests rbd: define parent image request routines rbd: define rbd_dev_unparent() rbd: don't release write request until necessary rbd: get parent info on refresh rbd: ignore zero-overlap parent rbd: support reading parent page data for writes rbd: fix parent request size assumption libceph: init sent and completed when starting rbd: kill rbd_img_request_get() rbd: only set up watch for mapped images rbd: set mapping read-only flag in rbd_add() rbd: support reading parent page data rbd: fix an incorrect assertion condition rbd: define rbd_dev_v2_header_info() rbd: get rid of trivial v1 header wrappers ...
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