[PATCH] init: Use ktime_us_delta() to make initcall_debug log more precise

[Mark-PK Tsai]

Use ktime_us_delta() to make the initcall_debug log more precise than
right shifting the result of ktime_to_ns() by 10 bits.

Signed-off-by: Mark-PK Tsai <mark-pk.tsai@xxxxxxxxxxxx>
---
 init/main.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/init/main.c b/init/main.c
index 65fa2e41a9c0..c8edcc3029b1 100644
--- a/init/main.c
+++ b/init/main.c
@@ -1246,15 +1246,11 @@ trace_initcall_start_cb(void *data, initcall_t fn)
 static __init_or_module void
 trace_initcall_finish_cb(void *data, initcall_t fn, int ret)
 {
-	ktime_t *calltime = (ktime_t *)data;
-	ktime_t delta, rettime;
-	unsigned long long duration;
+	ktime_t rettime, *calltime = (ktime_t *)data;
 
 	rettime = ktime_get();
-	delta = ktime_sub(rettime, *calltime);
-	duration = (unsigned long long) ktime_to_ns(delta) >> 10;
 	printk(KERN_DEBUG "initcall %pS returned %d after %lld usecs\n",
-		 fn, ret, duration);
+		 fn, ret, (unsigned long long)ktime_us_delta(rettime, *calltime));
 }
 
 static ktime_t initcall_calltime;
-- 
2.18.0