RE: [PATCHv5 00/11] Remove ARM local timer API
> -Original Message-
> From: Stephen Boyd [mailto:sb...@codeaurora.org]
> Sent: Saturday, April 20, 2013 12:20 AM
> To: linux-arm-ker...@lists.infradead.org
> Cc: linux-kernel@vger.kernel.org; linux-arm-...@vger.kernel.org; Mark
> Rutland; Marc Zyngier; Kukjin Kim; Barry Song; Daniel Walker; Bryan Huntsman;
> Tony Lindgren; John Stultz; Thomas Gleixner; Thomas Abraham
> Subject: [PATCHv5 00/11] Remove ARM local timer API
>
> 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.
Stephen, I hope I can give a test soon. But I have some others in higher
priority now.
> [1] http://article.gmane.org/gmane.linux.ports.arm.kernel/145705
-barry
Member of the CSR plc group of companies. CSR plc registered in England and
Wales, registered number 4187346, registered office Churchill House, Cambridge
Business Park, Cowley Road, Cambridge, CB4 0WZ, United Kingdom
More information can be found at www.csr.com. Follow CSR on Twitter at
http://twitter.com/CSR_PLC and read our blog at www.csr.com/blog
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RE: [PATCHv5 00/11] Remove ARM local timer API
-Original Message-
From: Stephen Boyd [mailto:sb...@codeaurora.org]
Sent: Saturday, April 20, 2013 12:20 AM
To: linux-arm-ker...@lists.infradead.org
Cc: linux-kernel@vger.kernel.org; linux-arm-...@vger.kernel.org; Mark
Rutland; Marc Zyngier; Kukjin Kim; Barry Song; Daniel Walker; Bryan Huntsman;
Tony Lindgren; John Stultz; Thomas Gleixner; Thomas Abraham
Subject: [PATCHv5 00/11] Remove ARM local timer API
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.
Stephen, I hope I can give a test soon. But I have some others in higher
priority now.
[1] http://article.gmane.org/gmane.linux.ports.arm.kernel/145705
-barry
Member of the CSR plc group of companies. CSR plc registered in England and
Wales, registered number 4187346, registered office Churchill House, Cambridge
Business Park, Cowley Road, Cambridge, CB4 0WZ, United Kingdom
More information can be found at www.csr.com. Follow CSR on Twitter at
http://twitter.com/CSR_PLC and read our blog at www.csr.com/blog
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[PATCHv5 00/11] Remove ARM local timer API
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 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| 122 +-- 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 | 61 +++- 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, 338 insertions(+), 345 deletions(-) delete mode 100644 arch/arm/include/asm/localtimer.h create mode 100644 drivers/clocksource/dummy_timer.c -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, hosted by The Linux Foundation -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
[PATCHv5 00/11] Remove ARM local timer API
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 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| 122 +-- 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 | 61 +++- 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, 338 insertions(+), 345 deletions(-) delete mode 100644 arch/arm/include/asm/localtimer.h create mode 100644 drivers/clocksource/dummy_timer.c -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, hosted by The Linux Foundation -- To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
