The patch titled
vsyscall time() fix
has been removed from the -mm tree. Its filename was
vsyscall-time-fix.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: vsyscall time() fix
From: john stultz <johnstul@xxxxxxxxxx>
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.
Big thanks to Sripathi for noticing this issue and creating a test case to
work with!
This patch changes the vtime() implementation to call vgettimeofday(), much as
syscall time() implementation calls gettimeofday().
Signed-off-by: John Stultz <johnstul@xxxxxxxxxx>
Cc: Sripathi Kodi <sripathi@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/x86_64/kernel/vsyscall.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff -puN arch/x86_64/kernel/vsyscall.c~vsyscall-time-fix arch/x86_64/kernel/vsyscall.c
--- a/arch/x86_64/kernel/vsyscall.c~vsyscall-time-fix
+++ a/arch/x86_64/kernel/vsyscall.c
@@ -161,10 +161,13 @@ int __vsyscall(0) vgettimeofday(struct t
* 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;
_
Patches currently in -mm which might be from johnstul@xxxxxxxxxx are
origin.patch
i386-hpet-check-if-the-counter-works.patch
introduce-boot-based-time.patch
introduce-boot-based-time-fix.patch
use-boot-based-time-for-process-start-time-and-boot-time.patch
use-boot-based-time-for-process-start-time-and-boot-time-fix.patch
use-boot-based-time-for-process-start-time-and-boot-time-fix-2.patch
use-boot-based-time-for-process-start-time-and-boot-time-fix-3.patch
use-boot-based-time-for-uptime-in-proc.patch
-
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