summaryrefslogtreecommitdiffstats
path: root/arch/x86/vdso
diff options
context:
space:
mode:
authorJohn Stultz <john.stultz@linaro.org>2012-09-04 16:14:46 -0400
committerJohn Stultz <john.stultz@linaro.org>2012-09-24 12:38:09 -0400
commit650ea02475106e8d6bdf561896d2ffe0d1c0ebb4 (patch)
tree0e4e06e525c8e47cd3379addbbc4895f20347df7 /arch/x86/vdso
parent92bb1fcf57a0c2e45f7e67fbf0a8ed475a749236 (diff)
downloadop-kernel-dev-650ea02475106e8d6bdf561896d2ffe0d1c0ebb4.zip
op-kernel-dev-650ea02475106e8d6bdf561896d2ffe0d1c0ebb4.tar.gz
time: Convert x86_64 to using new update_vsyscall
Switch x86_64 to using sub-ns precise vsyscall Cc: Tony Luck <tony.luck@intel.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Paul Turner <pjt@google.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Richard Cochran <richardcochran@gmail.com> Cc: Prarit Bhargava <prarit@redhat.com> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
Diffstat (limited to 'arch/x86/vdso')
-rw-r--r--arch/x86/vdso/vclock_gettime.c22
1 files changed, 14 insertions, 8 deletions
diff --git a/arch/x86/vdso/vclock_gettime.c b/arch/x86/vdso/vclock_gettime.c
index 885eff4..4df6c37 100644
--- a/arch/x86/vdso/vclock_gettime.c
+++ b/arch/x86/vdso/vclock_gettime.c
@@ -80,7 +80,7 @@ notrace static long vdso_fallback_gtod(struct timeval *tv, struct timezone *tz)
}
-notrace static inline long vgetns(void)
+notrace static inline u64 vgetsns(void)
{
long v;
cycles_t cycles;
@@ -91,21 +91,24 @@ notrace static inline long vgetns(void)
else
return 0;
v = (cycles - gtod->clock.cycle_last) & gtod->clock.mask;
- return (v * gtod->clock.mult) >> gtod->clock.shift;
+ return v * gtod->clock.mult;
}
/* Code size doesn't matter (vdso is 4k anyway) and this is faster. */
notrace static int __always_inline do_realtime(struct timespec *ts)
{
- unsigned long seq, ns;
+ unsigned long seq;
+ u64 ns;
int mode;
+ ts->tv_nsec = 0;
do {
seq = read_seqcount_begin(&gtod->seq);
mode = gtod->clock.vclock_mode;
ts->tv_sec = gtod->wall_time_sec;
- ts->tv_nsec = gtod->wall_time_nsec;
- ns = vgetns();
+ ns = gtod->wall_time_snsec;
+ ns += vgetsns();
+ ns >>= gtod->clock.shift;
} while (unlikely(read_seqcount_retry(&gtod->seq, seq)));
timespec_add_ns(ts, ns);
@@ -114,15 +117,18 @@ notrace static int __always_inline do_realtime(struct timespec *ts)
notrace static int do_monotonic(struct timespec *ts)
{
- unsigned long seq, ns;
+ unsigned long seq;
+ u64 ns;
int mode;
+ ts->tv_nsec = 0;
do {
seq = read_seqcount_begin(&gtod->seq);
mode = gtod->clock.vclock_mode;
ts->tv_sec = gtod->monotonic_time_sec;
- ts->tv_nsec = gtod->monotonic_time_nsec;
- ns = vgetns();
+ ns = gtod->monotonic_time_snsec;
+ ns += vgetsns();
+ ns >>= gtod->clock.shift;
} while (unlikely(read_seqcount_retry(&gtod->seq, seq)));
timespec_add_ns(ts, ns);
OpenPOWER on IntegriCloud