Commit b3550164 authored by Arnd Bergmann's avatar Arnd Bergmann
Browse files

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.

Reviewed-by: default avatarGeert Uytterhoeven <geert@linux-m68k.org>
Reviewed-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
parent 77f6c0b8

include/linux/timekeeping.h

+1 −0
Original line number Diff line number Diff line
@@ -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

kernel/time/Kconfig

+7 −0
Original line number Diff line number Diff line
@@ -57,6 +57,13 @@ 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"

kernel/time/Makefile

+1 −0
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@@ -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

kernel/time/tick-legacy.c

0 → 100644
+19 −0
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// 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);

}