x86_64: vsyscall time() fix

The vsyscall time() function basically returns the second portion of
xtime directly.  This however means that there is about a ticks worth of
time each second where time() will return a second value less then what
gettimeofday() does.

Additionally, this window where vtime() is behind vgettimeofday() grows
when dynticks is enabled, so its probably good to get this in before
dynticks lands.

Big thanks to Sripathi for noticing this issue and creating a test case
to work with!

This patch changes the vtime() implemenation to call vgettimeofday(),
much as syscall time() implementation calls gettimeofday().

2.6.21 stable candidate too

Signed-off-by: John Stultz <johnstul@us.ibm.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/x86_64/kernel/vsyscall.c b/arch/x86_64/kernel/vsyscall.c
index 51d4c6fa88c8785776354ae0ca115fc46176b7b4..57660d58d5003209381c8e9c58b25f75b7ee3339 100644 (file)
--- a/arch/x86_64/kernel/vsyscall.c
+++ b/arch/x86_64/kernel/vsyscall.c
@@ -175,10 +175,13 @@ int __vsyscall(0) vgettimeofday(struct timeval * tv, struct timezone * tz)
  * unlikely */
 time_t __vsyscall(1) vtime(time_t *t)
 {
+       struct timeval tv;
        time_t result;
        if (unlikely(!__vsyscall_gtod_data.sysctl_enabled))
                return time_syscall(t);
-       result = __vsyscall_gtod_data.wall_time_sec;
+
+       vgettimeofday(&tv, 0);
+       result = tv.tv_sec;
        if (t)
                *t = result;
        return result;