timkeeping: Fix update_vsyscall to provide wall_to_monotonic offset

update_vsyscall() did not provide the wall_to_monotoinc offset,
so arch specific implementations tend to reference wall_to_monotonic
directly. This limits future cleanups in the timekeeping core, so
this patch fixes the update_vsyscall interface to provide
wall_to_monotonic, allowing wall_to_monotonic to be made static
as planned in Documentation/feature-removal-schedule.txt

Signed-off-by: John Stultz <johnstul@us.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Anton Blanchard <anton@samba.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Tony Luck <tony.luck@intel.com>
LKML-Reference: <1279068988-21864-7-git-send-email-johnstul@us.ibm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

6 files changed, 25 insertions, 19 deletions

diff --git a/arch/ia64/kernel/time.c b/arch/ia64/kernel/time.c
index 653b3c46ea82..ed6f22eb5b12 100644
--- a/arch/ia64/kernel/time.c
+++ b/arch/ia64/kernel/time.c
@@ -471,7 +471,8 @@ void update_vsyscall_tz(void)
 {
 }
 
-void update_vsyscall(struct timespec *wall, struct clocksource *c, u32 mult)
+void update_vsyscall(struct timespec *wall, struct timespec *wtm,
+                        struct clocksource *c, u32 mult)
 {
         unsigned long flags;
 
@@ -487,9 +488,9 @@ void update_vsyscall(struct timespec *wall, struct clocksource *c, u32 mult)
         /* copy kernel time structures */
         fsyscall_gtod_data.wall_time.tv_sec = wall->tv_sec;
         fsyscall_gtod_data.wall_time.tv_nsec = wall->tv_nsec;
-        fsyscall_gtod_data.monotonic_time.tv_sec = wall_to_monotonic.tv_sec
+        fsyscall_gtod_data.monotonic_time.tv_sec = wtm->tv_sec
                                                         + wall->tv_sec;
-        fsyscall_gtod_data.monotonic_time.tv_nsec = wall_to_monotonic.tv_nsec
+        fsyscall_gtod_data.monotonic_time.tv_nsec = wtm->tv_nsec
                                                         + wall->tv_nsec;
 
         /* normalize */
diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c
index 0711d60f40b0..e215f76bba1c 100644
--- a/arch/powerpc/kernel/time.c
+++ b/arch/powerpc/kernel/time.c
@@ -849,8 +849,8 @@ static cycle_t timebase_read(struct clocksource *cs)
         return (cycle_t)get_tb();
 }
 
-void update_vsyscall(struct timespec *wall_time, struct clocksource *clock,
-                     u32 mult)
+void update_vsyscall(struct timespec *wall_time, struct timespec *wtm,
+                        struct clocksource *clock, u32 mult)
 {
         u64 new_tb_to_xs, new_stamp_xsec;
 
@@ -882,8 +882,8 @@ void update_vsyscall(struct timespec *wall_time, struct clocksource *clock,
         vdso_data->tb_orig_stamp = clock->cycle_last;
         vdso_data->stamp_xsec = new_stamp_xsec;
         vdso_data->tb_to_xs = new_tb_to_xs;
-        vdso_data->wtom_clock_sec = wall_to_monotonic.tv_sec;
-        vdso_data->wtom_clock_nsec = wall_to_monotonic.tv_nsec;
+        vdso_data->wtom_clock_sec = wtm->tv_sec;
+        vdso_data->wtom_clock_nsec = wtm->tv_nsec;
         vdso_data->stamp_xtime = *wall_time;
         smp_wmb();
         ++(vdso_data->tb_update_count);
diff --git a/arch/s390/kernel/time.c b/arch/s390/kernel/time.c
index a2163c95eb98..aeb30c6f279c 100644
--- a/arch/s390/kernel/time.c
+++ b/arch/s390/kernel/time.c
@@ -207,8 +207,8 @@ struct clocksource * __init clocksource_default_clock(void)
         return &clocksource_tod;
 }
 
-void update_vsyscall(struct timespec *wall_time, struct clocksource *clock,
-                     u32 mult)
+void update_vsyscall(struct timespec *wall_time, struct timespec *wtm,
+                        struct clocksource *clock, u32 mult)
 {
         if (clock != &clocksource_tod)
                 return;
@@ -219,8 +219,8 @@ void update_vsyscall(struct timespec *wall_time, struct clocksource *clock,
         vdso_data->xtime_tod_stamp = clock->cycle_last;
         vdso_data->xtime_clock_sec = wall_time->tv_sec;
         vdso_data->xtime_clock_nsec = wall_time->tv_nsec;
-        vdso_data->wtom_clock_sec = wall_to_monotonic.tv_sec;
-        vdso_data->wtom_clock_nsec = wall_to_monotonic.tv_nsec;
+        vdso_data->wtom_clock_sec = wtm->tv_sec;
+        vdso_data->wtom_clock_nsec = wtm->tv_nsec;
         vdso_data->ntp_mult = mult;
         smp_wmb();
         ++vdso_data->tb_update_count;
diff --git a/arch/x86/kernel/vsyscall_64.c b/arch/x86/kernel/vsyscall_64.c
index dce0c3c5a787..dcbb28c4b694 100644
--- a/arch/x86/kernel/vsyscall_64.c
+++ b/arch/x86/kernel/vsyscall_64.c
@@ -73,8 +73,8 @@ void update_vsyscall_tz(void)
         write_sequnlock_irqrestore(&vsyscall_gtod_data.lock, flags);
 }
 
-void update_vsyscall(struct timespec *wall_time, struct clocksource *clock,
-                     u32 mult)
+void update_vsyscall(struct timespec *wall_time, struct timespec *wtm,
+                        struct clocksource *clock, u32 mult)
 {
         unsigned long flags;
 
@@ -87,7 +87,7 @@ 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.wall_to_monotonic = wall_to_monotonic;
+        vsyscall_gtod_data.wall_to_monotonic = *wtm;
         vsyscall_gtod_data.wall_time_coarse = __current_kernel_time();
         write_sequnlock_irqrestore(&vsyscall_gtod_data.lock, flags);
 }
diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h
index 5ea3c60c160c..21677d99a161 100644
--- a/include/linux/clocksource.h
+++ b/include/linux/clocksource.h
@@ -313,11 +313,13 @@ clocksource_calc_mult_shift(struct clocksource *cs, u32 freq, u32 minsec)
 
 #ifdef CONFIG_GENERIC_TIME_VSYSCALL
 extern void
-update_vsyscall(struct timespec *ts, struct clocksource *c, u32 mult);
+update_vsyscall(struct timespec *ts, struct timespec *wtm,
+                        struct clocksource *c, u32 mult);
 extern void update_vsyscall_tz(void);
 #else
 static inline void
-update_vsyscall(struct timespec *ts, struct clocksource *c, u32 mult)
+update_vsyscall(struct timespec *ts, struct timespec *wtm,
+                        struct clocksource *c, u32 mult)
 {
 }
 
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 73edd4074b50..b15c3acafd5a 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -170,7 +170,8 @@ void timekeeping_leap_insert(int leapsecond)
 {
         xtime.tv_sec += leapsecond;
         wall_to_monotonic.tv_sec -= leapsecond;
-        update_vsyscall(&xtime, timekeeper.clock, timekeeper.mult);
+        update_vsyscall(&xtime, &wall_to_monotonic, timekeeper.clock,
+                        timekeeper.mult);
 }
 
 /**
@@ -326,7 +327,8 @@ int do_settimeofday(struct timespec *tv)
         timekeeper.ntp_error = 0;
         ntp_clear();
 
-        update_vsyscall(&xtime, timekeeper.clock, timekeeper.mult);
+        update_vsyscall(&xtime, &wall_to_monotonic, timekeeper.clock,
+                                timekeeper.mult);
 
         write_sequnlock_irqrestore(&xtime_lock, flags);
 
@@ -809,7 +811,8 @@ void update_wall_time(void)
         }
 
         /* check to see if there is a new clocksource to use */
-        update_vsyscall(&xtime, timekeeper.clock, timekeeper.mult);
+        update_vsyscall(&xtime, &wall_to_monotonic, timekeeper.clock,
+                                timekeeper.mult);
 }
 
 /**