Merge branch 'timers-timekeeping-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'timers-timekeeping-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  um: Fix read_persistent_clock fallout
  kgdb: Do not access xtime directly
  powerpc: Clean up obsolete code relating to decrementer and timebase
  powerpc: Rework VDSO gettimeofday to prevent time going backwards
  clocksource: Add __clocksource_updatefreq_hz/khz methods
  x86: Convert common clocksources to use clocksource_register_hz/khz
  timekeeping: Make xtime and wall_to_monotonic static
  hrtimer: Cleanup direct access to wall_to_monotonic
  um: Convert to use read_persistent_clock
  timkeeping: Fix update_vsyscall to provide wall_to_monotonic offset
  powerpc: Cleanup xtime usage
  powerpc: Simplify update_vsyscall
  time: Kill off CONFIG_GENERIC_TIME
  time: Implement timespec_add
  x86: Fix vtime/file timestamp inconsistencies

Trivial conflicts in Documentation/feature-removal-schedule.txt

Much less trivial conflicts in arch/powerpc/kernel/time.c resolved as
per Thomas' earlier merge commit 47916be4e28c ("Merge branch
'powerpc.cherry-picks' into timers/clocksource")

4 files changed, 22 insertions, 18 deletions

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 6f77afa6bca9..baa34e510222 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -73,9 +73,6 @@ config ARCH_DEFCONFIG
         default "arch/x86/configs/i386_defconfig" if X86_32
         default "arch/x86/configs/x86_64_defconfig" if X86_64
 
-config GENERIC_TIME
-        def_bool y
-
 config GENERIC_CMOS_UPDATE
         def_bool y
 
@@ -2047,7 +2044,7 @@ config SCx200
 
 config SCx200HR_TIMER
         tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
-        depends on SCx200 && GENERIC_TIME
+        depends on SCx200
         default y
         ---help---
           This driver provides a clocksource built upon the on-chip
diff --git a/arch/x86/kernel/hpet.c b/arch/x86/kernel/hpet.c
index ba390d731175..33dbcc4ec5ff 100644
--- a/arch/x86/kernel/hpet.c
+++ b/arch/x86/kernel/hpet.c
@@ -16,7 +16,6 @@
 #include <asm/hpet.h>
 
 #define HPET_MASK                       CLOCKSOURCE_MASK(32)
-#define HPET_SHIFT                      22
 
 /* FSEC = 10^-15
    NSEC = 10^-9 */
@@ -787,7 +786,6 @@ static struct clocksource clocksource_hpet = {
         .rating         = 250,
         .read           = read_hpet,
         .mask           = HPET_MASK,
-        .shift          = HPET_SHIFT,
         .flags          = CLOCK_SOURCE_IS_CONTINUOUS,
         .resume         = hpet_resume_counter,
 #ifdef CONFIG_X86_64
@@ -798,6 +796,7 @@ static struct clocksource clocksource_hpet = {
 static int hpet_clocksource_register(void)
 {
         u64 start, now;
+        u64 hpet_freq;
         cycle_t t1;
 
         /* Start the counter */
@@ -832,9 +831,15 @@ static int hpet_clocksource_register(void)
          *  mult = (hpet_period * 2^shift)/10^6
          *  mult = (hpet_period << shift)/FSEC_PER_NSEC
          */
-        clocksource_hpet.mult = div_sc(hpet_period, FSEC_PER_NSEC, HPET_SHIFT);
 
-        clocksource_register(&clocksource_hpet);
+        /* Need to convert hpet_period (fsec/cyc) to cyc/sec:
+         *
+         * cyc/sec = FSEC_PER_SEC/hpet_period(fsec/cyc)
+         * cyc/sec = (FSEC_PER_NSEC * NSEC_PER_SEC)/hpet_period
+         */
+        hpet_freq = FSEC_PER_NSEC * NSEC_PER_SEC;
+        do_div(hpet_freq, hpet_period);
+        clocksource_register_hz(&clocksource_hpet, (u32)hpet_freq);
 
         return 0;
 }
diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c
index 9faf91ae1841..ce8e50239332 100644
--- a/arch/x86/kernel/tsc.c
+++ b/arch/x86/kernel/tsc.c
@@ -751,7 +751,6 @@ static struct clocksource clocksource_tsc = {
         .read                   = read_tsc,
         .resume                 = resume_tsc,
         .mask                   = CLOCKSOURCE_MASK(64),
-        .shift                  = 22,
         .flags                  = CLOCK_SOURCE_IS_CONTINUOUS |
                                   CLOCK_SOURCE_MUST_VERIFY,
 #ifdef CONFIG_X86_64
@@ -845,8 +844,6 @@ __cpuinit int unsynchronized_tsc(void)
 
 static void __init init_tsc_clocksource(void)
 {
-        clocksource_tsc.mult = clocksource_khz2mult(tsc_khz,
-                        clocksource_tsc.shift);
         if (tsc_clocksource_reliable)
                 clocksource_tsc.flags &= ~CLOCK_SOURCE_MUST_VERIFY;
         /* lower the rating if we already know its unstable: */
@@ -854,7 +851,7 @@ static void __init init_tsc_clocksource(void)
                 clocksource_tsc.rating = 0;
                 clocksource_tsc.flags &= ~CLOCK_SOURCE_IS_CONTINUOUS;
         }
-        clocksource_register(&clocksource_tsc);
+        clocksource_register_khz(&clocksource_tsc, tsc_khz);
 }
 
 #ifdef CONFIG_X86_64
diff --git a/arch/x86/kernel/vsyscall_64.c b/arch/x86/kernel/vsyscall_64.c
index 1c0c6ab9c60f..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);
 }
@@ -169,13 +169,18 @@ int __vsyscall(0) vgettimeofday(struct timeval * tv, struct timezone * tz)
  * unlikely */
 time_t __vsyscall(1) vtime(time_t *t)
 {
-        struct timeval tv;
+        unsigned seq;
         time_t result;
         if (unlikely(!__vsyscall_gtod_data.sysctl_enabled))
                 return time_syscall(t);
 
-        vgettimeofday(&tv, NULL);
-        result = tv.tv_sec;
+        do {
+                seq = read_seqbegin(&__vsyscall_gtod_data.lock);
+
+                result = __vsyscall_gtod_data.wall_time_sec;
+
+        } while (read_seqretry(&__vsyscall_gtod_data.lock, seq));
+
         if (t)
                 *t = result;
         return result;