Fix discrepancy between VDSO based gettimeofday() and sys_gettimeofday().

[safe/jmp/linux-2.6] / arch / x86 / kernel / vsyscall_64.c

diff --git a/arch/x86/kernel/vsyscall_64.c b/arch/x86/kernel/vsyscall_64.c
index 8a67e28..f24e8ac 100644 (file)
--- a/arch/x86/kernel/vsyscall_64.c
+++ b/arch/x86/kernel/vsyscall_64.c
@@ -64,6 +64,16 @@ struct vsyscall_gtod_data __vsyscall_gtod_data __section_vsyscall_gtod_data =
        .sysctl_enabled = 1,
 };
 
+void update_vsyscall_tz(void)
+{
+       unsigned long flags;
+
+       write_seqlock_irqsave(&vsyscall_gtod_data.lock, flags);
+       /* sys_tz has changed */
+       vsyscall_gtod_data.sys_tz = sys_tz;
+       write_sequnlock_irqrestore(&vsyscall_gtod_data.lock, flags);
+}
+
 void update_vsyscall(struct timespec *wall_time, struct clocksource *clock)
 {
        unsigned long flags;
@@ -77,7 +87,6 @@ void update_vsyscall(struct timespec *wall_time, struct clocksource *clock)
        vsyscall_gtod_data.clock.shift = clock->shift;
        vsyscall_gtod_data.wall_time_sec = wall_time->tv_sec;
        vsyscall_gtod_data.wall_time_nsec = wall_time->tv_nsec;
-       vsyscall_gtod_data.sys_tz = sys_tz;
        vsyscall_gtod_data.wall_to_monotonic = wall_to_monotonic;
        write_sequnlock_irqrestore(&vsyscall_gtod_data.lock, flags);
 }