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authorArnd Bergmann <arnd@arndb.de>2020-09-24 15:21:43 +0200
committerArnd Bergmann <arnd@arndb.de>2020-10-30 21:57:04 +0100
commitb3550164a19d62e515af6cacb5a31f0b2b3f9501 (patch)
tree237ecf1236ea097d572c1021d704933def5bbaeb /kernel/time
parent77f6c0b87479c4578ac0798fc249637092ac45a3 (diff)
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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: Geert Uytterhoeven <geert@linux-m68k.org> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'kernel/time')
-rw-r--r--kernel/time/Kconfig7
-rw-r--r--kernel/time/Makefile1
-rw-r--r--kernel/time/tick-legacy.c19
3 files changed, 27 insertions, 0 deletions
diff --git a/kernel/time/Kconfig b/kernel/time/Kconfig
index 51d298ccbe05..c6867f29d279 100644
--- a/kernel/time/Kconfig
+++ b/kernel/time/Kconfig
@@ -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"
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);
+}