Commit-ID: 4a19bd3d22d51a0c89db10879dacaffa0f52aecf
Gitweb: http://git.kernel.org/tip/4a19bd3d22d51a0c89db10879dacaffa0f52aecf
Author: Arnd Bergmann <arnd@xxxxxxxx>
AuthorDate: Fri, 17 Jun 2016 18:03:02 +0200
Committer: John Stultz <john.stultz@xxxxxxxxxx>
CommitDate: Mon, 20 Jun 2016 12:47:26 -0700
time: Avoid timespec in udelay_test
udelay_test_single() uses ktime_get_ts() to get two timespec values
and calculate the difference between them, while udelay_test_show()
uses the same to printk() the current monotonic time.
Both of these are y2038 safe on all machines, but we want to
get rid of struct timespec anyway, so this converts the code to
use ktime_get_ns() and ktime_get_ts64() respectively.
Cc: Prarit Bhargava <prarit@xxxxxxxxxx>
Cc: Richard Cochran <richardcochran@xxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
Signed-off-by: John Stultz <john.stultz@xxxxxxxxxx>
---
kernel/time/test_udelay.c | 16 ++++++++--------
1 file changed, 8 insertions(+), 8 deletions(-)
diff --git a/kernel/time/test_udelay.c b/kernel/time/test_udelay.c
index e622ba3..b0928ab 100644
--- a/kernel/time/test_udelay.c
+++ b/kernel/time/test_udelay.c
@@ -43,13 +43,13 @@ static int udelay_test_single(struct seq_file *s, int usecs, uint32_t iters)
int allowed_error_ns = usecs * 5;
for (i = 0; i < iters; ++i) {
- struct timespec ts1, ts2;
+ s64 kt1, kt2;
int time_passed;
- ktime_get_ts(&ts1);
+ kt1 = ktime_get_ns();
udelay(usecs);
- ktime_get_ts(&ts2);
- time_passed = timespec_to_ns(&ts2) - timespec_to_ns(&ts1);
+ kt2 = ktime_get_ns();
+ time_passed = kt2 - kt1;
if (i == 0 || time_passed < min)
min = time_passed;
@@ -87,11 +87,11 @@ static int udelay_test_show(struct seq_file *s, void *v)
if (usecs > 0 && iters > 0) {
return udelay_test_single(s, usecs, iters);
} else if (usecs == 0) {
- struct timespec ts;
+ struct timespec64 ts;
- ktime_get_ts(&ts);
- seq_printf(s, "udelay() test (lpj=%ld kt=%ld.%09ld)\n",
- loops_per_jiffy, ts.tv_sec, ts.tv_nsec);
+ ktime_get_ts64(&ts);
+ seq_printf(s, "udelay() test (lpj=%ld kt=%lld.%09ld)\n",
+ loops_per_jiffy, (s64)ts.tv_sec, ts.tv_nsec);
seq_puts(s, "usage:\n");
seq_puts(s, "echo USECS [ITERS] > " DEBUGFS_FILENAME "\n");
seq_puts(s, "cat " DEBUGFS_FILENAME "\n");
--
To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
|