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| author |   Martin Schwidefsky <schwidefsky@de.ibm.com> | 2016-11-16 09:48:41 +0100 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2017-02-07 07:27:13 +0100 |
| commit | ea417aa8a38bc7db929281d6dc4b671e75f51844 (patch) | |
| tree | 61f70f0f578d9ce66d40bcec03f727b7df256d76 /arch/s390/kernel/time.c | |
| parent | s390/topology: correct allocation of topology information (diff) | |
| download | linux-dev-ea417aa8a38bc7db929281d6dc4b671e75f51844.tar.xz linux-dev-ea417aa8a38bc7db929281d6dc4b671e75f51844.zip | |
s390/debug: make debug event time stamps relative to the boot TOD clock
The debug features currently uses absolute TOD time stamps for the
debug events. Given that the TOD clock can jump forward and backward
due to STP sync checks the order of debug events can get obfuscated.
Replace the absolute TOD time stamps with a delta to the IPL time
stamp. On a STP sync check the TOD clock correction is added to
the IPL time stamp as well to make the deltas unaffected by STP
sync check.
The readout of the debug feature entries will convert the deltas
back to absolute time stamps based on the Unix epoch.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to '')
| -rw-r--r-- | arch/s390/kernel/time.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/arch/s390/kernel/time.c b/arch/s390/kernel/time.c index eebbd6adc6c5..546e513a0271 100644 --- a/arch/s390/kernel/time.c +++ b/arch/s390/kernel/time.c @@ -110,7 +110,7 @@ unsigned long long monotonic_clock(void) } EXPORT_SYMBOL(monotonic_clock); -void tod_to_timeval(__u64 todval, struct timespec64 *xt) +static void tod_to_timeval(__u64 todval, struct timespec64 *xt) { unsigned long long sec; @@ -120,7 +120,6 @@ void tod_to_timeval(__u64 todval, struct timespec64 *xt) todval -= (sec * 1000000) << 12; xt->tv_nsec = ((todval * 1000) >> 12); } -EXPORT_SYMBOL(tod_to_timeval); void clock_comparator_work(void) { |