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authorArnd Bergmann <arnd@arndb.de>2016-06-17 18:03:02 +0200
committerJohn Stultz <john.stultz@linaro.org>2016-06-20 12:47:26 -0700
commit4a19bd3d22d51a0c89db10879dacaffa0f52aecf (patch)
treed6b94fc167155d529e1db63d762a83e01ae462e3 /kernel/time
parente6c2682a1da36a2e79d9bab470412374434ce89e (diff)
downloadlinux-4a19bd3d22d51a0c89db10879dacaffa0f52aecf.tar.bz2
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@redhat.com> Cc: Richard Cochran <richardcochran@gmail.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@kernel.org> Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
Diffstat (limited to 'kernel/time')
-rw-r--r--kernel/time/test_udelay.c16
1 files changed, 8 insertions, 8 deletions
diff --git a/kernel/time/test_udelay.c b/kernel/time/test_udelay.c
index e622ba365a13..b0928ab3270f 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");