This is a note to let you know that I've just added the patch titled
selftests/ptp: Fix timestamp printf format for PTP_SYS_OFFSET
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
selftests-ptp-fix-timestamp-printf-format-for-ptp_sy.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 0fc7a9c3e30634a9f9582cbdd6db08f84f2bd019
Author: Alex Maftei <alex.maftei@xxxxxxx>
Date: Thu Jun 15 09:34:04 2023 +0100
selftests/ptp: Fix timestamp printf format for PTP_SYS_OFFSET
[ Upstream commit 76a4c8b82938bc5020b67663db41f451684bf327 ]
Previously, timestamps were printed using "%lld.%u" which is incorrect
for nanosecond values lower than 100,000,000 as they're fractional
digits, therefore leading zeros are meaningful.
This patch changes the format strings to "%lld.%09u" in order to add
leading zeros to the nanosecond value.
Fixes: 568ebc5985f5 ("ptp: add the PTP_SYS_OFFSET ioctl to the testptp program")
Fixes: 4ec54f95736f ("ptp: Fix compiler warnings in the testptp utility")
Fixes: 6ab0e475f1f3 ("Documentation: fix misc. warnings")
Signed-off-by: Alex Maftei <alex.maftei@xxxxxxx>
Acked-by: Richard Cochran <richardcochran@xxxxxxxxx>
Link: https://lore.kernel.org/r/20230615083404.57112-1-alex.maftei@xxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/tools/testing/selftests/ptp/testptp.c b/tools/testing/selftests/ptp/testptp.c
index f7911aaeb0075..aa474febb4712 100644
--- a/tools/testing/selftests/ptp/testptp.c
+++ b/tools/testing/selftests/ptp/testptp.c
@@ -492,11 +492,11 @@ int main(int argc, char *argv[])
interval = t2 - t1;
offset = (t2 + t1) / 2 - tp;
- printf("system time: %lld.%u\n",
+ printf("system time: %lld.%09u\n",
(pct+2*i)->sec, (pct+2*i)->nsec);
- printf("phc time: %lld.%u\n",
+ printf("phc time: %lld.%09u\n",
(pct+2*i+1)->sec, (pct+2*i+1)->nsec);
- printf("system time: %lld.%u\n",
+ printf("system time: %lld.%09u\n",
(pct+2*i+2)->sec, (pct+2*i+2)->nsec);
printf("system/phc clock time offset is %" PRId64 " ns\n"
"system clock time delay is %" PRId64 " ns\n",
