4 files changed, 22 insertions, 1 deletions

diff --git a/arch/ia64/kernel/time.c b/arch/ia64/kernel/time.c
index 98cfc90cab1d..2bb84214e5f1 100644
--- a/arch/ia64/kernel/time.c
+++ b/arch/ia64/kernel/time.c
@@ -371,6 +371,11 @@ ia64_setup_printk_clock(void)
                 ia64_printk_clock = ia64_itc_printk_clock;
 }
 
+/* IA64 doesn't cache the timezone */
+void update_vsyscall_tz(void)
+{
+}
+
 void update_vsyscall(struct timespec *wall, struct clocksource *c)
 {
         unsigned long flags;
diff --git a/arch/x86/kernel/vsyscall_64.c b/arch/x86/kernel/vsyscall_64.c
index 8a67e282cb5e..f24e8acdec91 100644
--- 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);
 }
diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h
index 16ea3374dddf..107787aacb64 100644
--- a/include/linux/clocksource.h
+++ b/include/linux/clocksource.h
@@ -221,10 +221,15 @@ extern void clocksource_resume(void);
 
 #ifdef CONFIG_GENERIC_TIME_VSYSCALL
 extern void update_vsyscall(struct timespec *ts, struct clocksource *c);
+extern void update_vsyscall_tz(void);
 #else
 static inline void update_vsyscall(struct timespec *ts, struct clocksource *c)
 {
 }
+
+static inline void update_vsyscall_tz(void)
+{
+}
 #endif
 
 #endif /* _LINUX_CLOCKSOURCE_H */
diff --git a/kernel/time.c b/kernel/time.c
index 2d5b6a682138..d9725bdcd045 100644
--- a/kernel/time.c
+++ b/kernel/time.c
@@ -30,6 +30,7 @@
 #include <linux/module.h>
 #include <linux/timex.h>
 #include <linux/capability.h>
+#include <linux/clocksource.h>
 #include <linux/errno.h>
 #include <linux/syscalls.h>
 #include <linux/security.h>
@@ -158,6 +159,7 @@ int do_sys_settimeofday(struct timespec *tv, struct timezone *tz)
         if (tz) {
                 /* SMP safe, global irq locking makes it work. */
                 sys_tz = *tz;
+                update_vsyscall_tz();
                 if (firsttime) {
                         firsttime = 0;
                         if (!tv)