[PATCH 00/13] Clean up legacy clock tick users

[Arnd Bergmann]

When I created the patch removing CONFIG_ARCH_GETTIMEOFFSET,
I also had a look at CONFIG_GENERIC_CLOCKEVENTS, which is
selected by most, but not all, platforms today, each of the
ones that lack it doing the timer tick slightly differently.

The cleanups here make the old platforms a bit more
consistent, in multiple ways:

- rather than selecting GENERIC_CLOCKEVENTS on modern
  platforms, select LEGACY_TIMER_TICK on the old ones.

- Hide some more of the internal implementation and only
  provide a single common entry point for the timer tick,
  which also makes the behavior more consistent.

- Remove the m68k and arm specific infrastructure pieces
  and call the common helper directly from each timer
  interrupt function.

I tested the series on m68k with the qemu q800 target
platform, both with the legacy_timer_tick() implementation
and after converting that to a periodic clockevent driver.

     Arnd

Arnd Bergmann (13):
  timekeeping: add CONFIG_LEGACY_TIMER_TICK
  ia64: convert to legacy_timer_tick
  ARM: rpc: use legacy_timer_tick
  parisc: use legacy_timer_tick
  m68k: coldfire: use legacy_timer_tick()
  m68k: split heartbeat out of timer function
  m68k: sun3/sun3c: use legacy_timer_tick
  m68k: m68328: use legacy_timer_tick()
  m68k: change remaining timers to legacy_timer_tick
  m68k: remove timer_interrupt() function
  timekeeping: remove xtime_update
  timekeeping: default GENERIC_CLOCKEVENTS to enabled
  [RFC] m68k: mac: convert to generic clockevent

 .../time/clockevents/arch-support.txt         |  8 ++--
 arch/alpha/Kconfig                            |  1 -
 arch/arc/Kconfig                              |  1 -
 arch/arm/Kconfig                              | 13 +-----
 arch/arm/include/asm/mach/time.h              |  2 -
 arch/arm/kernel/time.c                        | 14 ------
 arch/arm/mach-rpc/time.c                      |  2 +-
 arch/arm64/Kconfig                            |  1 -
 arch/arm64/Kconfig.platforms                  |  1 -
 arch/c6x/Kconfig                              |  1 -
 arch/csky/Kconfig                             |  1 -
 arch/h8300/Kconfig                            |  1 -
 arch/hexagon/Kconfig                          |  1 -
 arch/ia64/Kconfig                             |  1 +
 arch/ia64/kernel/time.c                       | 36 ++++++---------
 arch/m68k/68000/timers.c                      |  7 ++-
 arch/m68k/Kconfig.cpu                         | 34 +++++++++++---
 arch/m68k/Kconfig.machine                     | 15 +++++++
 arch/m68k/amiga/config.c                      | 11 +++--
 arch/m68k/apollo/config.c                     | 11 +++--
 arch/m68k/atari/config.c                      |  2 +-
 arch/m68k/atari/time.c                        |  9 ++--
 arch/m68k/bvme6000/config.c                   |  9 ++--
 arch/m68k/coldfire/Makefile                   | 32 ++++++++------
 arch/m68k/coldfire/pit.c                      |  2 +-
 arch/m68k/coldfire/sltimers.c                 |  8 ++--
 arch/m68k/coldfire/timers.c                   |  8 ++--
 arch/m68k/hp300/time.c                        |  8 ++--
 arch/m68k/hp300/time.h                        |  2 +-
 arch/m68k/include/asm/machdep.h               | 12 +++--
 arch/m68k/kernel/setup_mm.c                   |  2 +-
 arch/m68k/kernel/setup_no.c                   |  2 +-
 arch/m68k/kernel/time.c                       | 18 ++------
 arch/m68k/mac/config.c                        |  6 +--
 arch/m68k/mac/via.c                           | 44 +++++++++++++++----
 arch/m68k/mvme147/config.c                    |  9 ++--
 arch/m68k/mvme16x/config.c                    |  9 ++--
 arch/m68k/q40/config.c                        |  2 +-
 arch/m68k/q40/q40ints.c                       | 10 ++---
 arch/m68k/sun3/config.c                       |  4 +-
 arch/m68k/sun3/sun3ints.c                     |  3 +-
 arch/m68k/sun3x/time.c                        |  5 +--
 arch/m68k/sun3x/time.h                        |  2 +-
 arch/microblaze/Kconfig                       |  1 -
 arch/mips/Kconfig                             |  1 -
 arch/nds32/Kconfig                            |  1 -
 arch/nios2/Kconfig                            |  1 -
 arch/openrisc/Kconfig                         |  1 -
 arch/parisc/Kconfig                           |  2 +-
 arch/parisc/kernel/time.c                     |  9 ++--
 arch/powerpc/Kconfig                          |  1 -
 arch/riscv/Kconfig                            |  1 -
 arch/s390/Kconfig                             |  1 -
 arch/sh/Kconfig                               |  1 -
 arch/sparc/Kconfig                            |  1 -
 arch/um/Kconfig                               |  1 -
 arch/x86/Kconfig                              |  1 -
 arch/xtensa/Kconfig                           |  1 -
 include/linux/timekeeping.h                   |  5 +--
 kernel/time/Kconfig                           |  9 +++-
 kernel/time/Makefile                          |  1 +
 kernel/time/tick-legacy.c                     | 37 ++++++++++++++++
 kernel/time/timekeeping.c                     | 16 -------
 kernel/time/timekeeping.h                     |  1 +
 64 files changed, 242 insertions(+), 221 deletions(-)
 create mode 100644 kernel/time/tick-legacy.c

Cc: Russell King <linux@xxxxxxxxxxxxxxx>
Cc: Tony Luck <tony.luck@xxxxxxxxx>
Cc: Fenghua Yu <fenghua.yu@xxxxxxxxx>
Cc: Greg Ungerer <gerg@xxxxxxxxxxxxxx>
Cc: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Cc: Finn Thain <fthain@xxxxxxxxxxxxxxxxxxx>
Cc: Philip Blundell <philb@xxxxxxx>
Cc: Joshua Thompson <funaho@xxxxxxxxx>
Cc: Sam Creasey <sammy@xxxxxxxxx>
Cc: "James E.J. Bottomley" <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx>
Cc: Helge Deller <deller@xxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
Cc: John Stultz <john.stultz@xxxxxxxxxx>
Cc: Stephen Boyd <sboyd@xxxxxxxxxx>
Cc: Linus Walleij <linus.walleij@xxxxxxxxxx>
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: linux-ia64@xxxxxxxxxxxxxxx
Cc: linux-parisc@xxxxxxxxxxxxxxx
Cc: linux-m68k@xxxxxxxxxxxxxxxxxxxx
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx

-- 
2.27.0