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

Arnd Bergmann
2020-10-08T15:46:38Z

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@armlinux.org.uk>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Greg Ungerer <gerg@linux-m68k.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Finn Thain <fthain@telegraphics.com.au>
Cc: Philip Blundell <philb@gnu.org>
Cc: Joshua Thompson <funaho@jurai.org>
Cc: Sam Creasey <sammy@sammy.net>
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc: Helge Deller <deller@gmx.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Stephen Boyd <sboyd@kernel.org>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: linux-kernel@vger.kernel.org
Cc: linux-ia64@vger.kernel.org
Cc: linux-parisc@vger.kernel.org
Cc: linux-m68k@lists.linux-m68k.org
Cc: linux-arm-kernel@lists.infradead.org

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2.27.0