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Date: Thu, 8 Oct 2020 17:46:39 +0200 From: Arnd Bergmann <arnd@...db.de> To: linux-kernel@...r.kernel.org Cc: Arnd Bergmann <arnd@...db.de>, Russell King <linux@...linux.org.uk>, Tony Luck <tony.luck@...el.com>, Fenghua Yu <fenghua.yu@...el.com>, Greg Ungerer <gerg@...ux-m68k.org>, Geert Uytterhoeven <geert@...ux-m68k.org>, Finn Thain <fthain@...egraphics.com.au>, Philip Blundell <philb@....org>, Joshua Thompson <funaho@...ai.org>, Sam Creasey <sammy@...my.net>, "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>, Helge Deller <deller@....de>, Thomas Gleixner <tglx@...utronix.de>, Daniel Lezcano <daniel.lezcano@...aro.org>, John Stultz <john.stultz@...aro.org>, Stephen Boyd <sboyd@...nel.org>, Linus Walleij <linus.walleij@...aro.org>, linux-ia64@...r.kernel.org, linux-parisc@...r.kernel.org, linux-m68k@...ts.linux-m68k.org, linux-arm-kernel@...ts.infradead.org Subject: [PATCH 01/13] timekeeping: add CONFIG_LEGACY_TIMER_TICK All platforms that currently do not use generic clockevents roughly call the same set of functions in their timer interrupts: xtime_update(), update_process_times() and profile_tick(), sometimes in a different sequence. Add a helper function that performs all three of them, to make the callers more uniform and simplify the interface. Signed-off-by: Arnd Bergmann <arnd@...db.de> --- include/linux/timekeeping.h | 1 + kernel/time/Kconfig | 7 +++++++ kernel/time/Makefile | 1 + kernel/time/tick-legacy.c | 19 +++++++++++++++++++ 4 files changed, 28 insertions(+) create mode 100644 kernel/time/tick-legacy.c diff --git a/include/linux/timekeeping.h b/include/linux/timekeeping.h index 7f7e4a3f4394..3670cb1670ff 100644 --- a/include/linux/timekeeping.h +++ b/include/linux/timekeeping.h @@ -12,6 +12,7 @@ extern int timekeeping_suspended; /* Architecture timer tick functions: */ extern void update_process_times(int user); extern void xtime_update(unsigned long ticks); +extern void legacy_timer_tick(unsigned long ticks); /* * Get and set timeofday diff --git a/kernel/time/Kconfig b/kernel/time/Kconfig index a09b1d61df6a..f2b0cfeade47 100644 --- a/kernel/time/Kconfig +++ b/kernel/time/Kconfig @@ -61,6 +61,13 @@ config POSIX_CPU_TIMERS_TASK_WORK bool default y if POSIX_TIMERS && HAVE_POSIX_CPU_TIMERS_TASK_WORK +config LEGACY_TIMER_TICK + bool + help + The legacy timer tick helper is used by platforms that + lack support for the generic clockevent framework. + New platforms should use generic clockevents instead. + if GENERIC_CLOCKEVENTS menu "Timers subsystem" diff --git a/kernel/time/Makefile b/kernel/time/Makefile index c8f00168afe8..1fb1c1ef6a19 100644 --- a/kernel/time/Makefile +++ b/kernel/time/Makefile @@ -16,6 +16,7 @@ ifeq ($(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST),y) endif obj-$(CONFIG_GENERIC_SCHED_CLOCK) += sched_clock.o obj-$(CONFIG_TICK_ONESHOT) += tick-oneshot.o tick-sched.o +obj-$(CONFIG_LEGACY_TIMER_TICK) += tick-legacy.o obj-$(CONFIG_HAVE_GENERIC_VDSO) += vsyscall.o obj-$(CONFIG_DEBUG_FS) += timekeeping_debug.o obj-$(CONFIG_TEST_UDELAY) += test_udelay.o diff --git a/kernel/time/tick-legacy.c b/kernel/time/tick-legacy.c new file mode 100644 index 000000000000..73c5a0af4743 --- /dev/null +++ b/kernel/time/tick-legacy.c @@ -0,0 +1,19 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Timer tick function for architectures that lack generic clockevents, + * consolidated here from m68k/ia64/parisc/arm. + */ + +#include <linux/irq.h> +#include <linux/profile.h> +#include <linux/timekeeper_internal.h> + +#include "tick-internal.h" + +void legacy_timer_tick(unsigned long ticks) +{ + if (ticks) + xtime_update(ticks); + update_process_times(user_mode(get_irq_regs())); + profile_tick(CPU_PROFILING); +} -- 2.27.0
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