[PATCH v15 18/26] ARM/time: remove read_boot_clock64()

[Pavel Tatashin]

read_boot_clock64() is deleted, and replaced with
read_persistent_wall_and_boot_offset().

The default implementation of read_persistent_wall_and_boot_offset()
provides a better fallback than the current stubs for read_boot_clock64()
that arm has with no users, so remove the old code.

Signed-off-by: Pavel Tatashin <pasha.tatas...@oracle.com>
---
 arch/arm/include/asm/mach/time.h    |  3 +--
 arch/arm/kernel/time.c              | 15 ++-------------
 arch/arm/plat-omap/counter_32k.c    |  2 +-
 drivers/clocksource/tegra20_timer.c |  2 +-
 4 files changed, 5 insertions(+), 17 deletions(-)

diff --git a/arch/arm/include/asm/mach/time.h b/arch/arm/include/asm/mach/time.h
index 0f79e4dec7f9..4ac3a019a46f 100644
--- a/arch/arm/include/asm/mach/time.h
+++ b/arch/arm/include/asm/mach/time.h
@@ -13,7 +13,6 @@
 extern void timer_tick(void);
 
 typedef void (*clock_access_fn)(struct timespec64 *);
-extern int register_persistent_clock(clock_access_fn read_boot,
-                                    clock_access_fn read_persistent);
+extern int register_persistent_clock(clock_access_fn read_persistent);
 
 #endif
diff --git a/arch/arm/kernel/time.c b/arch/arm/kernel/time.c
index cf2701cb0de8..078b259ead4e 100644
--- a/arch/arm/kernel/time.c
+++ b/arch/arm/kernel/time.c
@@ -83,29 +83,18 @@ static void dummy_clock_access(struct timespec64 *ts)
 }
 
 static clock_access_fn __read_persistent_clock = dummy_clock_access;
-static clock_access_fn __read_boot_clock = dummy_clock_access;
 
 void read_persistent_clock64(struct timespec64 *ts)
 {
        __read_persistent_clock(ts);
 }
 
-void read_boot_clock64(struct timespec64 *ts)
-{
-       __read_boot_clock(ts);
-}
-
-int __init register_persistent_clock(clock_access_fn read_boot,
-                                    clock_access_fn read_persistent)
+int __init register_persistent_clock(clock_access_fn read_persistent)
 {
        /* Only allow the clockaccess functions to be registered once */
-       if (__read_persistent_clock == dummy_clock_access &&
-           __read_boot_clock == dummy_clock_access) {
-               if (read_boot)
-                       __read_boot_clock = read_boot;
+       if (__read_persistent_clock == dummy_clock_access) {
                if (read_persistent)
                        __read_persistent_clock = read_persistent;
-
                return 0;
        }
 
diff --git a/arch/arm/plat-omap/counter_32k.c b/arch/arm/plat-omap/counter_32k.c
index 2438b96004c1..fcc5bfec8bd1 100644
--- a/arch/arm/plat-omap/counter_32k.c
+++ b/arch/arm/plat-omap/counter_32k.c
@@ -110,7 +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_clock64);
+       register_persistent_clock(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 c337a8100a7b..2242a36fc5b0 100644
--- a/drivers/clocksource/tegra20_timer.c
+++ b/drivers/clocksource/tegra20_timer.c
@@ -259,6 +259,6 @@ static int __init tegra20_init_rtc(struct device_node *np)
        else
                clk_prepare_enable(clk);
 
-       return register_persistent_clock(NULL, tegra_read_persistent_clock64);
+       return register_persistent_clock(tegra_read_persistent_clock64);
 }
 TIMER_OF_DECLARE(tegra20_rtc, "nvidia,tegra20-rtc", tegra20_init_rtc);
-- 
2.18.0