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clocksource: Add common vdso clock mode storage

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All architectures which use the generic VDSO code have their own storage
for the VDSO clock mode. That's pointless and just requires duplicate code.

Provide generic storage for it. The new Kconfig symbol is intermediate and
will be removed once all architectures are converted over.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Reviewed-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Link: https://lkml.kernel.org/r/20200207124403.028046322@linutronix.de
This commit is contained in:
Thomas Gleixner
2020-02-07 13:38:55 +01:00
parent eec399dd86
commit 5d51bee725
5 changed files with 42 additions and 5 deletions
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12
include/linux/clocksource.h
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@@ -23,10 +23,19 @@
struct clocksource;
struct module;
#ifdef CONFIG_ARCH_CLOCKSOURCE_DATA
#if defined(CONFIG_ARCH_CLOCKSOURCE_DATA) || \
defined(CONFIG_GENERIC_VDSO_CLOCK_MODE)
#include <asm/clocksource.h>
#endif
enum vdso_clock_mode {
VDSO_CLOCKMODE_NONE,
#ifdef CONFIG_GENERIC_VDSO_CLOCK_MODE
VDSO_ARCH_CLOCKMODES,
#endif
VDSO_CLOCKMODE_MAX,
};
/**
* struct clocksource - hardware abstraction for a free running counter
* Provides mostly state-free accessors to the underlying hardware.
@@ -97,6 +106,7 @@ struct clocksource {
const char *name;
struct list_head list;
int rating;
enum vdso_clock_mode vdso_clock_mode;
unsigned long flags;
int (*enable)(struct clocksource *cs);