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x86_64: vsyscall time() fix

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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>
This commit is contained in:
john stultz 2007-05-21 14:31:52 +02:00 committed by Linus Torvalds
parent d8902bfcac
commit d0aff6e6f4
1 changed files with 4 additions and 1 deletions
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5
arch/x86_64/kernel/vsyscall.c
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@ -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;