Subject: [PATCH v2 0/5] tick/broadcast: Allow per-cpu timers to be used instead of broadcast

From: Will Deacon <[email-masked]>
Date: Mon, 24 May 2021 23:18:13 +0100

Hi all,

This is version two of the series I posted last week:

  https://lore.kernel.org/r/[email-masked]

This patch series adds support for hardware where the per-cpu tick timer
cannot wake up from deep idle states (i.e. CLOCK_EVT_FEAT_C3STOP is set)
yet there is a secondary per-cpu timer which is generally less preferable
(i.e. slow to access) yet capable of delivering the wakeup.

Changes since v1 include:

  * Fixed module refcounting and use of clockevents_exchange_device()
  * Require CLOCK_EVT_FEAT_PERCPU for new wakeup per-cpu source
  * Fix transition to oneshot mode while idle
  * Tested on my x86 laptop

Cheers,

Will

Cc: Frederic Weisbecker <[email-masked]>
Cc: Thomas Gleixner <[email-masked]>
Cc: Marc Zyngier <[email-masked]>
Cc: Lorenzo Colitti <[email-masked]>
Cc: John Stultz <[email-masked]>
Cc: Stephen Boyd <[email-masked]>
Cc: Mika Penttilä <[email-masked]>
Cc: [email-masked]

--->8

Will Deacon (5):
  tick/broadcast: Drop unneeded CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
    guard
  tick/broadcast: Split __tick_broadcast_oneshot_control() into a helper
  tick/broadcast: Prefer per-cpu oneshot wakeup timers to broadcast
  tick/broadcast: Program wakeup timer when entering idle if required
  timer_list: Print name of per-cpu wakeup device

 kernel/time/tick-broadcast.c | 143 +++++++++++++++++++++++++++++++----
 kernel/time/tick-common.c    |   2 +-
 kernel/time/tick-internal.h  |   5 +-
 kernel/time/timer_list.c     |  10 ++-
 4 files changed, 140 insertions(+), 20 deletions(-)

-- 
2.31.1.818.g46aad6cb9e-goog

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