[PATCH 06/21] ARM: time: Provide read_boot_clock64() and read_persistent_clock64()

John Stultz
2015-04-02T03:39:05Z

From: Xunlei Pang <pang.xunlei@linaro.org>

As part of addressing "y2038 problem" for in-kernel uses, this
patch converts read_boot_clock() to read_boot_clock64() and
read_persistent_clock() to read_persistent_clock64() using
timespec64 by converting clock_access_fn to use timespec64.

Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@kernel.org>
Acked-by: Thierry Reding <treding@nvidia.com> (for tegra part)
Signed-off-by: Xunlei Pang <pang.xunlei@linaro.org>
Signed-off-by: John Stultz <john.stultz@linaro.org>
---
arch/arm/include/asm/mach/time.h | 3 +--
arch/arm/kernel/time.c | 6 +++---
arch/arm/plat-omap/counter_32k.c | 10 +---------
drivers/clocksource/tegra20_timer.c | 10 +---------
4 files changed, 6 insertions(+), 23 deletions(-)

diff --git a/arch/arm/include/asm/mach/time.h b/arch/arm/include/asm/mach/time.h
index 90c12e1..0f79e4d 100644
--- a/arch/arm/include/asm/mach/time.h
+++ b/arch/arm/include/asm/mach/time.h
@@ -12,8 +12,7 @@

extern void timer_tick(void);

-struct timespec;
-typedef void (*clock_access_fn)(struct timespec *);
+typedef void (*clock_access_fn)(struct timespec64 *);
extern int register_persistent_clock(clock_access_fn read_boot,
clock_access_fn read_persistent);

diff --git a/arch/arm/kernel/time.c b/arch/arm/kernel/time.c
index 0cc7e58..a66e37e 100644
--- a/arch/arm/kernel/time.c
+++ b/arch/arm/kernel/time.c
@@ -76,7 +76,7 @@ void timer_tick(void)
}
#endif

-static void dummy_clock_access(struct timespec *ts)
+static void dummy_clock_access(struct timespec64 *ts)
{
ts->tv_sec = 0;
ts->tv_nsec = 0;
@@ -85,12 +85,12 @@ static void dummy_clock_access(struct timespec *ts)
static clock_access_fn __read_persistent_clock = dummy_clock_access;
static clock_access_fn __read_boot_clock = dummy_clock_access;;

-void read_persistent_clock(struct timespec *ts)
+void read_persistent_clock64(struct timespec64 *ts)
{
__read_persistent_clock(ts);
}

-void read_boot_clock(struct timespec *ts)
+void read_boot_clock64(struct timespec64 *ts)
{
__read_boot_clock(ts);
}
diff --git a/arch/arm/plat-omap/counter_32k.c b/arch/arm/plat-omap/counter_32k.c
index b7b7b07..2438b96 100644
--- a/arch/arm/plat-omap/counter_32k.c
+++ b/arch/arm/plat-omap/counter_32k.c
@@ -70,14 +70,6 @@ static void omap_read_persistent_clock64(struct timespec64 *ts)
*ts = persistent_ts;
}

-static void omap_read_persistent_clock(struct timespec *ts)
-{
- struct timespec64 ts64;
-
- omap_read_persistent_clock64(&ts64);
- *ts = timespec64_to_timespec(ts64);
-}
-
/**
* omap_init_clocksource_32k - setup and register counter 32k as a
* kernel clocksource
@@ -118,7 +110,7 @@ int __init omap_init_clocksource_32k(void __iomem *vbase)
}

sched_clock_register(omap_32k_read_sched_clock, 32, 32768);
- register_persistent_clock(NULL, omap_read_persistent_clock);
+ register_persistent_clock(NULL, omap_read_persistent_clock64);
pr_info("OMAP clocksource: 32k_counter at 32768 Hz\n");

return 0;
diff --git a/drivers/clocksource/tegra20_timer.c b/drivers/clocksource/tegra20_timer.c
index 4a0a603..5a112d7 100644
--- a/drivers/clocksource/tegra20_timer.c
+++ b/drivers/clocksource/tegra20_timer.c
@@ -141,14 +141,6 @@ static void tegra_read_persistent_clock64(struct timespec64 *ts)
*ts = persistent_ts;
}

-static void tegra_read_persistent_clock(struct timespec *ts)
-{
- struct timespec ts64;
-
- tegra_read_persistent_clock64(&ts64);
- *ts = timespec64_to_timespec(ts64);
-}
-
static unsigned long tegra_delay_timer_read_counter_long(void)
{
return readl(timer_reg_base + TIMERUS_CNTR_1US);
@@ -259,7 +251,7 @@ static void __init tegra20_init_rtc(struct device_node *np)
else
clk_prepare_enable(clk);

- register_persistent_clock(NULL, tegra_read_persistent_clock);
+ register_persistent_clock(NULL, tegra_read_persistent_clock64);
}
CLOCKSOURCE_OF_DECLARE(tegra20_rtc, "nvidia,tegra20-rtc", tegra20_init_rtc);

--
1.9.1