Re: [PATCHv6 00/11] Remove ARM local timer API

[Stephen Boyd]

Comments have been light for this round so I think we're about
ready to merge. John/Thomas, can you pick up these patches or
shall I route them through arm-soc or something else?

On 05/13, Stephen Boyd wrote:
> In light of Mark Rutland's recent work on divorcing the ARM architected
> timers from the ARM local timer API and introducing a generic arch hook for
> broadcast it seems that we should remove the local timer API entirely.
> Doing so will reduce the architecture dependencies of our timer drivers,
> reduce code in ARM core, and simplify timer drivers because they no longer
> go through an architecture layer that is essentially a hotplug notifier.
> 
> Previous attempts have been made[1] unsuccessfully. I'm hoping this can
> be accepted now so that we can clean up the timer drivers that are
> used in both UP and SMP situations. Right now these drivers have to ignore
> the timer setup callback on the boot CPU to avoid registering clockevents
> twice. This is not very symmetric and causes convuluted code that does
> the same thing in two places.
> 
> Patches based on next-20130418
> 
> I'm still looking for Acks/Tested-by on EXYNOS and PRIMA2.
> 
> [1] http://article.gmane.org/gmane.linux.ports.arm.kernel/145705
> 
> Note: A hotplug notifier is used by both x86 for the apb_timer (see 
> apbt_cpuhp_notify) and by metag (see arch_timer_cpu_notify in
> metag_generic.c) so this is not new.
> 
> Changes since v5:
>  * Rebased onto v3.10-rc1
>  * Rebase caused minor updates to mct patch
> 
> Changes since v4:
>  * Rebased onto next-20130418
>  * Rebase caused minor updates to mct patch and twd Kconfig
> 
> Changes since v3:
>  * New patch to fix SMP with dummy timers registered after a global timer
>  * Push this_cpu_ptr lower to avoid preemptible false positive warnings
>  * Collected acks/tested-bys
> 
> Changes since v2:
>  * Bug fixes in smp_twd from Tony Lindgren's testing
>  * Move smp_twd to use late_time_init hook
>  * Collected Acks
> 
> Changes since v1:
>  * Picked up Mark's generic dummy timer driver
>  * Split out omap changes into new patch
> 
> Mark Rutland (1):
>   clocksource: add generic dummy timer driver
> 
> Stephen Boyd (10):
>   clockevents: Prefer CPU local devices over global devices
>   ARM: smp: Remove duplicate dummy timer implementation
>   ARM: smp_twd: Divorce smp_twd from local timer API
>   ARM: OMAP2+: Divorce from local timer API
>   ARM: EXYNOS4: Divorce mct from local timer API
>   ARM: PRIMA2: Divorce timer-marco from local timer API
>   ARM: msm: Divorce msm_timer from local timer API
>   clocksource: time-armada-370-xp: Fix sparse warning
>   clocksource: time-armada-370-xp: Divorce from local timer API
>   ARM: smp: Remove local timer API
> 
>  arch/arm/Kconfig                         |  12 +--
>  arch/arm/include/asm/localtimer.h        |  34 ---------
>  arch/arm/kernel/smp.c                    |  87 ---------------------
>  arch/arm/kernel/smp_twd.c                |  64 ++++++++++------
>  arch/arm/mach-highbank/Kconfig           |   2 +-
>  arch/arm/mach-imx/Kconfig                |   2 +-
>  arch/arm/mach-msm/timer.c                | 126 +++++++++++++++++--------------
>  arch/arm/mach-omap2/Kconfig              |   3 +-
>  arch/arm/mach-omap2/timer.c              |   7 --
>  arch/arm/mach-realview/Kconfig           |   8 +-
>  arch/arm/mach-spear/Kconfig              |   2 +-
>  arch/arm/mach-tegra/Kconfig              |   2 +-
>  arch/arm/mach-ux500/Kconfig              |   2 +-
>  arch/arm/mach-vexpress/Kconfig           |   2 +-
>  arch/arm/mach-zynq/Kconfig               |   2 +-
>  drivers/clocksource/Makefile             |   1 +
>  drivers/clocksource/dummy_timer.c        |  69 +++++++++++++++++
>  drivers/clocksource/exynos_mct.c         |  60 ++++++++++-----
>  drivers/clocksource/time-armada-370-xp.c |  92 +++++++++++-----------
>  drivers/clocksource/timer-marco.c        | 100 +++++++++++++-----------
>  include/linux/time-armada-370-xp.h       |   4 +-
>  kernel/time/tick-common.c                |   5 +-
>  22 files changed, 340 insertions(+), 346 deletions(-)
>  delete mode 100644 arch/arm/include/asm/localtimer.h
>  create mode 100644 drivers/clocksource/dummy_timer.c
> 
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