From: Aboorva Devarajan <aboor...@linux.ibm.com>
- Export `boot_tb` for external use, this is useful in perf vpa-dtl
interface, where `boot_tb` can be used to convert raw timebase
values to it's relative boot timestamp.
- Log the initial timebase at `time_init` as it is a useful
information which can be referred to as needed.
Signed-off-by: Aboorva Devarajan <aboor...@linux.ibm.com>
Signed-off-by: Kajol Jain <kj...@linux.ibm.com>
---
arch/powerpc/include/asm/time.h | 1 +
arch/powerpc/kernel/time.c | 4 +++-
2 files changed, 4 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/include/asm/time.h b/arch/powerpc/include/asm/time.h
index 9bdd8080299b..b6fc5df01d53 100644
--- a/arch/powerpc/include/asm/time.h
+++ b/arch/powerpc/include/asm/time.h
@@ -23,6 +23,7 @@ extern u64 decrementer_max;
extern unsigned long tb_ticks_per_jiffy;
extern unsigned long tb_ticks_per_usec;
extern unsigned long tb_ticks_per_sec;
+extern u64 boot_tb;
extern struct clock_event_device decrementer_clockevent;
extern u64 decrementer_max;
diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c
index 0727332ad86f..6e8548f0e48f 100644
--- a/arch/powerpc/kernel/time.c
+++ b/arch/powerpc/kernel/time.c
@@ -137,7 +137,8 @@ EXPORT_SYMBOL_GPL(rtc_lock);
static u64 tb_to_ns_scale __read_mostly;
static unsigned tb_to_ns_shift __read_mostly;
-static u64 boot_tb __read_mostly;
+u64 boot_tb __read_mostly;
+EXPORT_SYMBOL_GPL(boot_tb);
extern struct timezone sys_tz;
static long timezone_offset;
@@ -943,6 +944,7 @@ void __init time_init(void)
tb_to_ns_shift = shift;
/* Save the current timebase to pretty up CONFIG_PRINTK_TIME */
boot_tb = get_tb();
+ pr_debug("%s: timebase at boot: %llu\n", __func__, (unsigned long
long)boot_tb);
/* If platform provided a timezone (pmac), we correct the time */
if (timezone_offset) {
--
2.43.0
