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Subject[PATCH v6 0/6] timers: Use timer_shutdown*() before freeing timers

This is just the patches to implement the infrastructure of the
timer_shutdown_sync() and timer_shutdown(). I'll leave the scripting for the
second stage if this is approved.

Changes since the v5a: https://lore.kernel.org/all/20221106054535.709068702@goodmis.org/

- Broke up the implementation patch into three patches:

1. The code taken from Thomas and tweaked to compile and added comments,
as well as changing the name to timer_shutdown_sync():
https://lore.kernel.org/all/20221106054535.709068702@goodmis.org/

2. Addition of timer_shutdown() that is like del_timer() but uses the same
logic as timer_shutdown_sync() to disable the timer after it is called.

3. Update the documentation to reflect the new APIs.

Steven Rostedt (Google) (6):
ARM: spear: Do not use timer namespace for timer_shutdown() function
clocksource/drivers/arm_arch_timer: Do not use timer namespace for timer_shutdown() function
clocksource/drivers/sp804: Do not use timer namespace for timer_shutdown() function
timers: Add timer_shutdown_sync() to be called before freeing timers
timers: Add timer_shutdown() to be called before freeing timers
timers: Update the documentation to reflect on the new timer_shutdown() API

----
.../RCU/Design/Requirements/Requirements.rst | 2 +-
Documentation/core-api/local_ops.rst | 2 +-
Documentation/kernel-hacking/locking.rst | 5 ++
arch/arm/mach-spear/time.c | 8 +--
drivers/clocksource/arm_arch_timer.c | 12 ++--
drivers/clocksource/timer-sp804.c | 6 +-
include/linux/timer.h | 62 +++++++++++++++++++--
kernel/time/timer.c | 64 ++++++++++++----------
8 files changed, 110 insertions(+), 51 deletions(-)

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