diff options
| author | Andi Kleen <ak@suse.de> | 2007-09-11 14:02:09 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-09-12 09:28:06 -0700 |
| commit | 95b08679963c78ce0d675224a6efdb5169f2bf75 (patch) | |
| tree | 2b242803ab4f54333f874ffcf237fc9c7427a0a7 | |
| parent | 99364df764bbef327be2f8b8ffcfbb41a4a1af4d (diff) | |
x86_64: Add missing mask operation to vdso
vdso vgetns() didn't mask the time source offset calculation, which
could lead to time problems with 32bit HPET. Add the masking.
Thanks to Chuck Ebbert for tracking this down.
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Chuck Ebbert <cebbert@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | arch/x86_64/vdso/vclock_gettime.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/x86_64/vdso/vclock_gettime.c b/arch/x86_64/vdso/vclock_gettime.c index 17f6a00de71..5b54cdfb2b0 100644 --- a/arch/x86_64/vdso/vclock_gettime.c +++ b/arch/x86_64/vdso/vclock_gettime.c @@ -34,10 +34,11 @@ static long vdso_fallback_gettime(long clock, struct timespec *ts) static inline long vgetns(void) { + long v; cycles_t (*vread)(void); vread = gtod->clock.vread; - return ((vread() - gtod->clock.cycle_last) * gtod->clock.mult) >> - gtod->clock.shift; + v = (vread() - gtod->clock.cycle_last) & gtod->clock.mask; + return (v * gtod->clock.mult) >> gtod->clock.shift; } static noinline int do_realtime(struct timespec *ts) |