linux/kernel/time, branch v5.0

posix-cpu-timers: Unbreak timer rearming

2019-01-15T15:34:37Z

The recent commit which prevented a division by 0 issue in the alarm timer code broke posix CPU timers as an unwanted side effect. The reason is that the common rearm code checks for timer->it_interval being 0 now. What went unnoticed is that the posix cpu timer setup does not initialize timer->it_interval as it stores the interval in CPU timer specific storage. The reason for the separate storage is historical as the posix CPU timers always had a 64bit nanoseconds representation internally while timer->it_interval is type ktime_t which used to be a modified timespec representation on 32bit machines. Instead of reverting the offending commit and fixing the alarmtimer issue in the alarmtimer code, store the interval in timer->it_interval at CPU timer setup time so the common code check works. This also repairs the existing inconistency of the posix CPU timer code which kept a single shot timer armed despite of the interval being 0. The separate storage can be removed in mainline, but that needs to be a separate commit as the current one has to be backported to stable kernels. Fixes: 0e334db6bb4b ("posix-timers: Fix division by zero bug") Reported-by: H.J. Lu Signed-off-by: Thomas Gleixner Cc: John Stultz Cc: Peter Zijlstra Cc: stable@vger.kernel.org Link: https://lkml.kernel.org/r/20190111133500.840117406@linutronix.de

Merge tag 'y2038-for-4.21' of ssh://gitolite.kernel.org:/pub/scm/linux/kernel/git/arnd/playground

2018-12-28T20:45:04Z

Pull y2038 updates from Arnd Bergmann: "More syscalls and cleanups This concludes the main part of the system call rework for 64-bit time_t, which has spread over most of year 2018, the last six system calls being - ppoll - pselect6 - io_pgetevents - recvmmsg - futex - rt_sigtimedwait As before, nothing changes for 64-bit architectures, while 32-bit architectures gain another entry point that differs only in the layout of the timespec structure. Hopefully in the next release we can wire up all 22 of those system calls on all 32-bit architectures, which gives us a baseline version for glibc to start using them. This does not include the clock_adjtime, getrusage/waitid, and getitimer/setitimer system calls. I still plan to have new versions of those as well, but they are not required for correct operation of the C library since they can be emulated using the old 32-bit time_t based system calls. Aside from the system calls, there are also a few cleanups here, removing old kernel internal interfaces that have become unused after all references got removed. The arch/sh cleanups are part of this, there were posted several times over the past year without a reaction from the maintainers, while the corresponding changes made it into all other architectures" * tag 'y2038-for-4.21' of ssh://gitolite.kernel.org:/pub/scm/linux/kernel/git/arnd/playground: timekeeping: remove obsolete time accessors vfs: replace current_kernel_time64 with ktime equivalent timekeeping: remove timespec_add/timespec_del timekeeping: remove unused {read,update}_persistent_clock sh: remove board_time_init() callback sh: remove unused rtc_sh_get/set_time infrastructure sh: sh03: rtc: push down rtc class ops into driver sh: dreamcast: rtc: push down rtc class ops into driver y2038: signal: Add compat_sys_rt_sigtimedwait_time64 y2038: signal: Add sys_rt_sigtimedwait_time32 y2038: socket: Add compat_sys_recvmmsg_time64 y2038: futex: Add support for __kernel_timespec y2038: futex: Move compat implementation into futex.c io_pgetevents: use __kernel_timespec pselect6: use __kernel_timespec ppoll: use __kernel_timespec signal: Add restore_user_sigmask() signal: Add set_user_sigmask()

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

2018-12-25T23:44:08Z

Pull timer updates from Thomas Gleixner: "The timer department delivers the following christmas presents: Core code: - Use proper seqcount initializer to make lockdep happy - SPDX annotations and cleanup of license boilerplates - Use DEFINE_SHOW_ATTRIBUTE() instead of open coding it - Minor cleanups Driver code: - Add the sched_clock for the arc timer (Alexey Brodkin) - Change the file timer names for riscv, rockchip, tegra20, sun4i and meson6 (Daniel Lezcano) - Add the DT bindings for r8a7796, r8a77470 and r8a774a1 (Biju Das) - Remove the early platform driver registration for timer-ti-dm (Bartosz Golaszewski) - Provide the sched_clock for the riscv timer (Anup Patel) - Add support for ARM64 for the imx-gpt and convert the imx-tpm to the timer-of API (Anson Huang) - Remove useless irq protection for the imx-gpt (Clément Péron) - Remove a duplicate function name for the vt8500 (Dan Carpenter) - Remove obsolete inclusion of for the tegra20 (Geert Uytterhoeven) - Demote the prcmu and the custom sched_clock for the dbx500 and the ux500 (Linus Walleij) - Add a new timer clock for the RDA8810PL (Manivannan Sadhasivam) - Rename the macro to stick to the register name and add the delay timer (Martin Blumenstingl) - Switch the bcm2835 to the SPDX identifier (Stefan Wahren) - Fix the interrupt register access on the fttmr010 (Tao Ren) - Add missing of_node_put in the initialization path on the integrator-ap (Yangtao Li)" * 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (39 commits) dt-bindings: timer: Document RDA8810PL SoC timer clocksource/drivers/rda: Add clock driver for RDA8810PL SoC clocksource/drivers/meson6: Change name meson6_timer timer-meson6 clocksource/drivers/sun4i: Change name sun4i_timer to timer-sun4i clocksource/drivers/tegra20: Change name tegra20_timer to timer-tegra20 clocksource/drivers/rockchip: Change name rockchip_timer to timer-rockchip clocksource/drivers/riscv: Change name riscv_timer to timer-riscv clocksource/drivers/riscv_timer: Provide the sched_clock clocksource/drivers/timer-imx-tpm: Specify clock name for timer-of clocksource/drivers/fttmr010: Fix invalid interrupt register access clocksource/drivers/integrator-ap: Add missing of_node_put() clocksource/drivers/bcm2835: Switch to SPDX identifier dt-bindings: timer: renesas, cmt: Document r8a774a1 CMT support clocksource/drivers/timer-imx-tpm: Convert the driver to timer-of clocksource/drivers/arc_timer: Utilize generic sched_clock dt-bindings: timer: renesas, cmt: Document r8a77470 CMT support dt-bindings: timer: renesas, cmt: Document r8a7796 CMT support clocksource/drivers/imx-gpt: Remove unnecessary irq protection clocksource/drivers/imx-gpt: Add support for ARM64 clocksource/drivers/meson6_timer: Implement the ARM delay timer ...

timekeeping: remove timespec_add/timespec_del

2018-12-18T15:13:05Z

The last users were removed a while ago since everyone moved to ktime_t, so we can remove the two unused interfaces for old timespec structures. With those two gone, set_normalized_timespec() is also unused, so remove that as well. Signed-off-by: Arnd Bergmann Acked-by: John Stultz

timekeeping: remove unused {read,update}_persistent_clock

2018-12-18T15:13:05Z

After arch/sh has removed the last reference to these functions, we can remove them completely and just rely on the 64-bit time_t based versions. This cleans up a rather ugly use of __weak functions. Signed-off-by: Arnd Bergmann Acked-by: John Stultz

ntp: Remove duplicated include

2018-12-18T11:59:33Z

Signed-off-by: YueHaibing Signed-off-by: Thomas Gleixner Cc: Cc: Link: https://lkml.kernel.org/r/20181209062225.4344-1-yuehaibing@huawei.com

posix-timers: Fix division by zero bug

2018-12-17T16:35:45Z

The signal delivery path of posix-timers can try to rearm the timer even if the interval is zero. That's handled for the common case (hrtimer) but not for alarm timers. In that case the forwarding function raises a division by zero exception. The handling for hrtimer based posix timers is wrong because it marks the timer as active despite the fact that it is stopped. Move the check from common_hrtimer_rearm() to posixtimer_rearm() to cure both issues. Reported-by: syzbot+9d38bedac9cc77b8ad5e@syzkaller.appspotmail.com Signed-off-by: Thomas Gleixner Cc: John Stultz Cc: Linus Torvalds Cc: Peter Zijlstra Cc: sboyd@kernel.org Cc: stable@vger.kernel.org Cc: syzkaller-bugs@googlegroups.com Link: http://lkml.kernel.org/r/alpine.DEB.2.21.1812171328050.1880@nanos.tec.linutronix.de Signed-off-by: Ingo Molnar

timekeeping: Convert to DEFINE_SHOW_ATTRIBUTE

2018-12-12T02:13:35Z

Use DEFINE_SHOW_ATTRIBUTE macro to simplify the code. Signed-off-by: Yangtao Li Signed-off-by: Thomas Gleixner Cc: john.stultz@linaro.org Cc: sboyd@kernel.org Link: https://lkml.kernel.org/r/20181211163744.22133-1-tiny.windzz@gmail.com

timekeeping: Use proper seqcount initializer

2018-12-05T10:00:09Z

tk_core.seq is initialized open coded, but that misses to initialize the lockdep map when lockdep is enabled. Lockdep splats involving tk_core seq consequently lack a name and are hard to read. Use the proper initializer which takes care of the lockdep map initialization. [ tglx: Massaged changelog ] Signed-off-by: Bart Van Assche Signed-off-by: Thomas Gleixner Cc: peterz@infradead.org Cc: tj@kernel.org Cc: johannes.berg@intel.com Link: https://lkml.kernel.org/r/20181128234325.110011-12-bvanassche@acm.org

posix-timers: Remove license boilerplate

2018-11-23T10:51:22Z

The SPDX identifier defines the license of the file already. No need for the boilerplate. Remove also the completely outdated Montavista snail mail address. Signed-off-by: Thomas Gleixner Acked-by: Kees Cook Acked-by: Ingo Molnar Acked-by: John Stultz Acked-by: Corey Minyard Cc: Peter Zijlstra Cc: Kate Stewart Cc: Philippe Ombredanne Cc: Peter Anvin Cc: Russell King Cc: Richard Cochran Cc: "Paul E. McKenney" Cc: Nicolas Pitre Cc: David Riley Cc: Colin Cross Cc: Mark Brown Link: https://lkml.kernel.org/r/20181031182253.479792883@linutronix.de