linux-toradex.git/kernel/time/alarmtimer.c, branch v5.19-rc1

alarmtimer: Check RTC features instead of ops

2021-05-11T19:28:04+00:00

RTC drivers used to leave .set_alarm() NULL in order to signal the RTC
device doesn't support alarms. The drivers are now clearing the
RTC_FEATURE_ALARM bit for that purpose in order to keep the rtc_class_ops
structure const. So now, .set_alarm() is set unconditionally and this
possibly causes the alarmtimer code to select an RTC device that doesn't
support alarms.

Test RTC_FEATURE_ALARM instead of relying on ops->set_alarm to determine
whether alarms are available.

Fixes: 7ae41220ef58 ("rtc: introduce features bitfield")
Signed-off-by: Alexandre Belloni 
Signed-off-by: Thomas Gleixner 
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20210511014516.563031-1-alexandre.belloni@bootlin.com

Merge tag 'timers-core-2021-04-26' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2021-04-26T16:54:03+00:00

Pull timer updates from Thomas Gleixner:
 "The time and timers updates contain:

  Core changes:

   - Allow runtime power management when the clocksource is changed.

   - A correctness fix for clock_adjtime32() so that the return value on
     success is not overwritten by the result of the copy to user.

   - Allow late installment of broadcast clockevent devices which was
     broken because nothing switched them over to oneshot mode. This
     went unnoticed so far because clockevent devices used to be built
     in, but now people started to make them modular.

   - Debugfs related simplifications

   - Small cleanups and improvements here and there

  Driver changes:

   - The usual set of device tree binding updates for a wide range of
     drivers/devices.

   - The usual updates and improvements for drivers all over the place
     but nothing outstanding.

   - No new clocksource/event drivers. They'll come back next time"

* tag 'timers-core-2021-04-26' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (24 commits)
  posix-timers: Preserve return value in clock_adjtime32()
  tick/broadcast: Allow late registered device to enter oneshot mode
  tick: Use tick_check_replacement() instead of open coding it
  time/timecounter: Mark 1st argument of timecounter_cyc2time() as const
  dt-bindings: timer: nuvoton,npcm7xx: Add wpcm450-timer
  clocksource/drivers/arm_arch_timer: Add __ro_after_init and __init
  clocksource/drivers/timer-ti-dm: Handle dra7 timer wrap errata i940
  clocksource/drivers/timer-ti-dm: Prepare to handle dra7 timer wrap issue
  clocksource/drivers/dw_apb_timer_of: Add handling for potential memory leak
  clocksource/drivers/npcm: Add support for WPCM450
  clocksource/drivers/sh_cmt: Don't use CMTOUT_IE with R-Car Gen2/3
  clocksource/drivers/pistachio: Fix trivial typo
  clocksource/drivers/ingenic_ost: Fix return value check in ingenic_ost_probe()
  clocksource/drivers/timer-ti-dm: Add missing set_state_oneshot_stopped
  clocksource/drivers/timer-ti-dm: Fix posted mode status check order
  dt-bindings: timer: renesas,cmt: Document R8A77961
  dt-bindings: timer: renesas,cmt: Add r8a779a0 CMT support
  clocksource/drivers/ingenic-ost: Add support for the JZ4760B
  clocksource/drivers/ingenic: Add support for the JZ4760
  dt-bindings: timer: ingenic: Add compatible strings for JZ4760(B)
  ...

timekeeping, clocksource: Fix various typos in comments

2021-03-22T22:06:48+00:00

Fix ~56 single-word typos in timekeeping & clocksource code comments.

Signed-off-by: Ingo Molnar 
Cc: Thomas Gleixner 
Cc: John Stultz 
Cc: Stephen Boyd 
Cc: Daniel Lezcano 
Cc: linux-kernel@vger.kernel.org

kernel, fs: Introduce and use set_restart_fn() and arch_set_restart_data()

2021-03-16T21:13:10+00:00

Preparation for fixing get_nr_restart_syscall() on X86 for COMPAT.

Add a new helper which sets restart_block->fn and calls a dummy
arch_set_restart_data() helper.

Fixes: 609c19a385c8 ("x86/ptrace: Stop setting TS_COMPAT in ptrace code")
Signed-off-by: Oleg Nesterov 
Signed-off-by: Thomas Gleixner 
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20210201174641.GA17871@redhat.com

alarmtimer: Update kerneldoc

2021-02-05T18:26:41+00:00

Update kerneldoc comments to reflect the actual arguments and return values
of the documented functions.

Signed-off-by: Alexandre Belloni 
Signed-off-by: Thomas Gleixner 
Link: https://lore.kernel.org/r/20210202013457.3482388-1-alexandre.belloni@bootlin.com

alarmtimer: Convert comma to semicolon

2020-08-25T10:45:53+00:00

Replace a comma between expression statements by a semicolon.

Signed-off-by: Xu Wang 
Signed-off-by: Thomas Gleixner 
Reviewed-by: Stephen Boyd 
Link: https://lore.kernel.org/r/20200818062651.21680-1-vulab@iscas.ac.cn

time: Delete repeated words in comments

2020-08-10T20:14:07+00:00

Drop repeated words in kernel/time/.  {when, one, into}

Signed-off-by: Randy Dunlap 
Signed-off-by: Thomas Gleixner 
Acked-by: John Stultz 
Link: https://lore.kernel.org/r/20200807033248.8452-1-rdunlap@infradead.org

alarmtimer: Make alarmtimer_get_rtcdev() a stub when CONFIG_RTC_CLASS=n

2020-01-24T20:03:53+00:00

The stubbed version of alarmtimer_get_rtcdev() is not exported.
so this won't work if this function is used in a module when
CONFIG_RTC_CLASS=n.

Move the stub function to the header file and make it inline so that
callers don't have to worry about linking against this symbol.

rtcdev isn't used outside of this ifdef so it's not required to be
redefined to NULL. Drop that while touching this area.

Signed-off-by: Stephen Boyd 
Signed-off-by: Thomas Gleixner 
Link: https://lore.kernel.org/r/20200124055849.154411-4-swboyd@chromium.org

alarmtimer: Use wakeup source from alarmtimer platform device

2020-01-24T20:00:21+00:00

Use the wakeup source that can be associated with the 'alarmtimer'
platform device instead of registering another one by hand.

Signed-off-by: Stephen Boyd 
Signed-off-by: Thomas Gleixner 
Reviewed-by: Douglas Anderson 
Link: https://lore.kernel.org/r/20200124055849.154411-3-swboyd@chromium.org

alarmtimer: Make alarmtimer platform device child of RTC device

2020-01-24T20:00:20+00:00

The alarmtimer_suspend() function will fail if an RTC device is on a bus
such as SPI or i2c and that RTC device registers and probes after
alarmtimer_init() registers and probes the 'alarmtimer' platform device.

This is because system wide suspend suspends devices in the reverse order
of their probe. When alarmtimer_suspend() attempts to program the RTC for a
wakeup it will try to program an RTC device on a bus that has already been
suspended.

Move the alarmtimer device registration to happen when the RTC which is
used for wakeup is registered. Register the 'alarmtimer' platform device as
a child of the RTC device too, so that it can be guaranteed that the RTC
device won't be suspended when alarmtimer_suspend() is called.

Reported-by: Douglas Anderson 
Signed-off-by: Stephen Boyd 
Signed-off-by: Thomas Gleixner 
Reviewed-by: Douglas Anderson 
Link: https://lore.kernel.org/r/20200124055849.154411-2-swboyd@chromium.org