Re: [PATCH 5.10.y 00/15] timers: Provide timer_shutdown[_sync]()

[Greg KH <gregkh@linuxfoundation.org>]

On Fri, Feb 20, 2026 at 02:12:55AM +0900, Jeongjun Park wrote:
> The "timers: Provide timer_shutdown[_sync]()" patch series implemented a
> useful feature that addresses various bugs caused by attempts to rearm
> shutdown timers.
> 
> https://lore.kernel.org/all/20221123201306.823305113@linutronix.de/
> 
> However, this patch series was not fully backported to versions prior to
> 6.2, requiring separate patches for older kernels if these bugs were
> encountered.
> 
> The biggest problem with this is that even if these bugs were discovered
> and patched in the upstream kernel, if the maintainer or author didn't
> create a separate backport patch for versions prior to 6.2, the bugs would
> remain untouched in older kernels.
> 
> Therefore, to reduce the hassle of having to write a separate patch, we
> should backport the remaining unbackported commits from the
> "timers: Provide timer_shutdown[_sync]()" patch series to versions prior
> to 6.2.
> 
> ---
>  Documentation/RCU/Design/Requirements/Requirements.rst      |   2 +-
>  Documentation/core-api/local_ops.rst                        |   2 +-
>  Documentation/kernel-hacking/locking.rst                    |  17 ++---
>  Documentation/timers/hrtimers.rst                           |   2 +-
>  Documentation/translations/it_IT/kernel-hacking/locking.rst |  14 ++---
>  arch/arm/mach-spear/time.c                                  |   8 +--
>  drivers/bluetooth/hci_qca.c                                 |  10 ++-
>  drivers/char/tpm/tpm-dev-common.c                           |   4 +-
>  drivers/clocksource/arm_arch_timer.c                        |  12 ++--
>  drivers/clocksource/timer-sp804.c                           |   6 +-
>  drivers/staging/wlan-ng/hfa384x_usb.c                       |   4 +-
>  drivers/staging/wlan-ng/prism2usb.c                         |   6 +-
>  include/linux/timer.h                                       |  17 ++++-
>  kernel/time/timer.c                                         | 316 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-----------------
>  net/sunrpc/xprt.c                                           |   2 +-
>  15 files changed, 322 insertions(+), 100 deletions(-)
> 

Ugh, I got the following build error for this series:
../drivers/misc/sgi-xp/xpc_partition.c: In function 'xpc_partition_disengaged':
../drivers/misc/sgi-xp/xpc_partition.c:294:25: error: implicit declaration of function 'del_singleshot_timer_sync' [-Werror=implicit-function-declaration]
  294 |                         del_singleshot_timer_sync(&part->disengage_timer);
      |                         ^~~~~~~~~~~~~~~~~~~~~~~~~


Don't know what happened, but I'll go and drop them all now.

Do you _REALLY_ need these in the 5.10.y kernel?  Who is going to use
them?

thanks,

greg k-h