From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stephen Boyd Subject: [PATCHv3 00/10] Remove ARM local timer API Date: Wed, 13 Mar 2013 11:17:46 -0700 Message-ID: <1363198676-30417-1-git-send-email-sboyd@codeaurora.org> Return-path: Sender: linux-kernel-owner@vger.kernel.org To: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, Mark Rutland , Marc Zyngier , Kukjin Kim , Barry Song , Daniel Walker , Bryan Huntsman , Gregory CLEMENT , Santosh Shilimkar , Tony Lindgren , John Stultz , Thomas Gleixner List-Id: linux-arm-msm@vger.kernel.org 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 v3.9-rc2. 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 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 (9): 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-exynos/mct.c | 53 +++++++++---- arch/arm/mach-msm/timer.c | 125 +++++++++++++++++-------------- arch/arm/mach-omap2/Kconfig | 1 - arch/arm/mach-omap2/timer.c | 7 -- arch/arm/mach-prima2/timer-marco.c | 98 ++++++++++++------------ drivers/clocksource/Makefile | 1 + drivers/clocksource/dummy_timer.c | 67 +++++++++++++++++ drivers/clocksource/time-armada-370-xp.c | 88 ++++++++++------------ include/linux/time-armada-370-xp.h | 4 +- 13 files changed, 309 insertions(+), 332 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 From mboxrd@z Thu Jan 1 00:00:00 1970 From: sboyd@codeaurora.org (Stephen Boyd) Date: Wed, 13 Mar 2013 11:17:46 -0700 Subject: [PATCHv3 00/10] Remove ARM local timer API Message-ID: <1363198676-30417-1-git-send-email-sboyd@codeaurora.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 v3.9-rc2. 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 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 (9): 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-exynos/mct.c | 53 +++++++++---- arch/arm/mach-msm/timer.c | 125 +++++++++++++++++-------------- arch/arm/mach-omap2/Kconfig | 1 - arch/arm/mach-omap2/timer.c | 7 -- arch/arm/mach-prima2/timer-marco.c | 98 ++++++++++++------------ drivers/clocksource/Makefile | 1 + drivers/clocksource/dummy_timer.c | 67 +++++++++++++++++ drivers/clocksource/time-armada-370-xp.c | 88 ++++++++++------------ include/linux/time-armada-370-xp.h | 4 +- 13 files changed, 309 insertions(+), 332 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