time: Kill off CONFIG_GENERIC_TIME

Now that all arches have been converted over to use generic time via
clocksources or arch_gettimeoffset(), we can remove the GENERIC_TIME
config option and simplify the generic code.

Signed-off-by: John Stultz <johnstul@us.ibm.com>
LKML-Reference: <1279068988-21864-4-git-send-email-johnstul@us.ibm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

33 files changed, 19 insertions, 159 deletions

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 2b2407d9a6d0..8abdfd7cb571 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -73,7 +73,6 @@ parameter is applicable:
         MTD     MTD (Memory Technology Device) support is enabled.
         NET     Appropriate network support is enabled.
         NUMA    NUMA support is enabled.
-        GENERIC_TIME The generic timeofday code is enabled.
         NFS     Appropriate NFS support is enabled.
         OSS     OSS sound support is enabled.
         PV_OPS  A paravirtualized kernel is enabled.
@@ -468,7 +467,7 @@ and is between 256 and 4096 characters. It is defined in the file
                         clocksource is not available, it defaults to PIT.
                         Format: { pit | tsc | cyclone | pmtmr }
 
-        clocksource=    [GENERIC_TIME] Override the default clocksource
+        clocksource=    Override the default clocksource
                         Format: <string>
                         Override the default clocksource and use the clocksource
                         with the name specified.
diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig
index 3e2e540a0f2a..b9647bb66d13 100644
--- a/arch/alpha/Kconfig
+++ b/arch/alpha/Kconfig
@@ -47,10 +47,6 @@ config GENERIC_CALIBRATE_DELAY
         bool
         default y
 
-config GENERIC_TIME
-        bool
-        default y
-
 config GENERIC_CMOS_UPDATE
         def_bool y
 
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 98922f7d2d12..655b4ae76314 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -41,10 +41,6 @@ config SYS_SUPPORTS_APM_EMULATION
 config GENERIC_GPIO
         bool
 
-config GENERIC_TIME
-        bool
-        default y
-
 config ARCH_USES_GETTIMEOFFSET
         bool
         default n
diff --git a/arch/avr32/Kconfig b/arch/avr32/Kconfig
index f2b319333184..f51572772e21 100644
--- a/arch/avr32/Kconfig
+++ b/arch/avr32/Kconfig
@@ -45,9 +45,6 @@ config GENERIC_IRQ_PROBE
 config RWSEM_GENERIC_SPINLOCK
         def_bool y
 
-config GENERIC_TIME
-        def_bool y
-
 config GENERIC_CLOCKEVENTS
         def_bool y
 
diff --git a/arch/blackfin/Kconfig b/arch/blackfin/Kconfig
index f66294b4f9d2..c88fd3584122 100644
--- a/arch/blackfin/Kconfig
+++ b/arch/blackfin/Kconfig
@@ -614,9 +614,6 @@ comment "Kernel Timer/Scheduler"
 
 source kernel/Kconfig.hz
 
-config GENERIC_TIME
-        def_bool y
-
 config GENERIC_CLOCKEVENTS
         bool "Generic clock events"
         default y
diff --git a/arch/cris/Kconfig b/arch/cris/Kconfig
index e25bf4440b51..887ef855be2a 100644
--- a/arch/cris/Kconfig
+++ b/arch/cris/Kconfig
@@ -20,9 +20,6 @@ config RWSEM_GENERIC_SPINLOCK
 config RWSEM_XCHGADD_ALGORITHM
         bool
 
-config GENERIC_TIME
-        def_bool y
-
 config GENERIC_CMOS_UPDATE
         def_bool y
 
diff --git a/arch/frv/Kconfig b/arch/frv/Kconfig
index 4b5830bcbe2e..16399bd24993 100644
--- a/arch/frv/Kconfig
+++ b/arch/frv/Kconfig
@@ -40,10 +40,6 @@ config GENERIC_HARDIRQS_NO__DO_IRQ
         bool
         default y
 
-config GENERIC_TIME
-        bool
-        default y
-
 config TIME_LOW_RES
         bool
         default y
diff --git a/arch/h8300/Kconfig b/arch/h8300/Kconfig
index 53cc669e6d59..988b6ff34cc4 100644
--- a/arch/h8300/Kconfig
+++ b/arch/h8300/Kconfig
@@ -62,10 +62,6 @@ config GENERIC_CALIBRATE_DELAY
         bool
         default y
 
-config GENERIC_TIME
-        bool
-        default y
-
 config GENERIC_BUG
         bool
         depends on BUG
diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index 95610820041e..8711d13cd79f 100644
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -82,10 +82,6 @@ config GENERIC_CALIBRATE_DELAY
         bool
         default y
 
-config GENERIC_TIME
-        bool
-        default y
-
 config GENERIC_TIME_VSYSCALL
         bool
         default y
diff --git a/arch/m32r/Kconfig b/arch/m32r/Kconfig
index 3a9319f93e89..836abbbc9c04 100644
--- a/arch/m32r/Kconfig
+++ b/arch/m32r/Kconfig
@@ -44,9 +44,6 @@ config HZ
         int
         default 100
 
-config GENERIC_TIME
-        def_bool y
-
 config ARCH_USES_GETTIMEOFFSET
         def_bool y
 
diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig
index 2e3737b92ffc..8030e2481d97 100644
--- a/arch/m68k/Kconfig
+++ b/arch/m68k/Kconfig
@@ -59,9 +59,6 @@ config HZ
         int
         default 100
 
-config GENERIC_TIME
-        def_bool y
-
 config ARCH_USES_GETTIMEOFFSET
         def_bool y
 
diff --git a/arch/m68knommu/Kconfig b/arch/m68knommu/Kconfig
index efeb6033fc17..2609c394e1df 100644
--- a/arch/m68knommu/Kconfig
+++ b/arch/m68knommu/Kconfig
@@ -63,10 +63,6 @@ config GENERIC_CALIBRATE_DELAY
         bool
         default y
 
-config GENERIC_TIME
-        bool
-        default y
-
 config GENERIC_CMOS_UPDATE
         bool
         default y
diff --git a/arch/microblaze/Kconfig b/arch/microblaze/Kconfig
index 505a08592423..14f03cea94a1 100644
--- a/arch/microblaze/Kconfig
+++ b/arch/microblaze/Kconfig
@@ -48,9 +48,6 @@ config GENERIC_IRQ_PROBE
 config GENERIC_CALIBRATE_DELAY
         def_bool y
 
-config GENERIC_TIME
-        def_bool y
-
 config GENERIC_TIME_VSYSCALL
         def_bool n
 
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index cdaae942623d..01c44cbdf163 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -733,10 +733,6 @@ config GENERIC_CLOCKEVENTS
         bool
         default y
 
-config GENERIC_TIME
-        bool
-        default y
-
 config GENERIC_CMOS_UPDATE
         bool
         default y
diff --git a/arch/mn10300/Kconfig b/arch/mn10300/Kconfig
index 1c4565a9102b..444b9f918fdf 100644
--- a/arch/mn10300/Kconfig
+++ b/arch/mn10300/Kconfig
@@ -46,9 +46,6 @@ config GENERIC_FIND_NEXT_BIT
 config GENERIC_HWEIGHT
         def_bool y
 
-config GENERIC_TIME
-        def_bool y
-
 config GENERIC_BUG
         def_bool y
 
diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig
index 05a366a5c4d5..907417d187e1 100644
--- a/arch/parisc/Kconfig
+++ b/arch/parisc/Kconfig
@@ -66,10 +66,6 @@ config GENERIC_CALIBRATE_DELAY
         bool
         default y
 
-config GENERIC_TIME
-        bool
-        default y
-
 config TIME_LOW_RES
         bool
         depends on SMP
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 2031a2846865..25e6bf457457 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -29,9 +29,6 @@ config MMU
 config GENERIC_CMOS_UPDATE
         def_bool y
 
-config GENERIC_TIME
-        def_bool y
-
 config GENERIC_TIME_VSYSCALL
         def_bool y
 
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index bee1c0f794cf..f0777a47e3a5 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -40,9 +40,6 @@ config ARCH_HAS_ILOG2_U64
 config GENERIC_HWEIGHT
         def_bool y
 
-config GENERIC_TIME
-        def_bool y
-
 config GENERIC_TIME_VSYSCALL
         def_bool y
 
diff --git a/arch/score/Kconfig b/arch/score/Kconfig
index 55d413e6dcf2..be4a15584751 100644
--- a/arch/score/Kconfig
+++ b/arch/score/Kconfig
@@ -55,9 +55,6 @@ config GENERIC_CALIBRATE_DELAY
 config GENERIC_CLOCKEVENTS
         def_bool y
 
-config GENERIC_TIME
-        def_bool y
-
 config SCHED_NO_NO_OMIT_FRAME_POINTER
         def_bool y
 
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 82868fee21fd..33990fa95af0 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -98,9 +98,6 @@ config GENERIC_CALIBRATE_DELAY
 config GENERIC_IOMAP
         bool
 
-config GENERIC_TIME
-        def_bool y
-
 config GENERIC_CLOCKEVENTS
         def_bool y
 
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index c0015db247ba..1cd0d9d3c761 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -66,9 +66,6 @@ config BITS
         default 32 if SPARC32
         default 64 if SPARC64
 
-config GENERIC_TIME
-        def_bool y
-
 config ARCH_USES_GETTIMEOFFSET
         bool
         default y if SPARC32
diff --git a/arch/um/Kconfig.common b/arch/um/Kconfig.common
index 0d207e73a758..7c8e277f6d34 100644
--- a/arch/um/Kconfig.common
+++ b/arch/um/Kconfig.common
@@ -55,10 +55,6 @@ config GENERIC_BUG
         default y
         depends on BUG
 
-config GENERIC_TIME
-        bool
-        default y
-
 config GENERIC_CLOCKEVENTS
         bool
         default y
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index dcb0593b4a66..546b610ad71c 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -72,9 +72,6 @@ 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
 
@@ -2046,7 +2043,7 @@ 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/xtensa/Kconfig b/arch/xtensa/Kconfig
index ebe228d02b08..0859bfd8ae93 100644
--- a/arch/xtensa/Kconfig
+++ b/arch/xtensa/Kconfig
@@ -48,9 +48,6 @@ config HZ
         int
         default 100
 
-config GENERIC_TIME
-        def_bool y
-
 source "init/Kconfig"
 source "kernel/Kconfig.freezer"
 
diff --git a/drivers/Makefile b/drivers/Makefile
index 91874e048552..ae473445ad6d 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -101,7 +101,9 @@ obj-y				+= firmware/
 obj-$(CONFIG_CRYPTO)            += crypto/
 obj-$(CONFIG_SUPERH)            += sh/
 obj-$(CONFIG_ARCH_SHMOBILE)     += sh/
-obj-$(CONFIG_GENERIC_TIME)      += clocksource/
+ifndef CONFIG_ARCH_USES_GETTIMEOFFSET
+obj-y                           += clocksource/
+endif
 obj-$(CONFIG_DMA_ENGINE)        += dma/
 obj-$(CONFIG_DCA)               += dca/
 obj-$(CONFIG_HID)               += hid/
diff --git a/drivers/acpi/acpi_pad.c b/drivers/acpi/acpi_pad.c
index 446aced33aff..b76848c80be3 100644
--- a/drivers/acpi/acpi_pad.c
+++ b/drivers/acpi/acpi_pad.c
@@ -77,7 +77,7 @@ static void power_saving_mwait_init(void)
         power_saving_mwait_eax = (highest_cstate << MWAIT_SUBSTATE_SIZE) |
                 (highest_subcstate - 1);
 
-#if defined(CONFIG_GENERIC_TIME) && defined(CONFIG_X86)
+#if defined(CONFIG_X86)
         switch (boot_cpu_data.x86_vendor) {
         case X86_VENDOR_AMD:
         case X86_VENDOR_INTEL:
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index e9a8026d39f0..294e10b5480a 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -264,7 +264,7 @@ int acpi_processor_resume(struct acpi_device * device)
         return 0;
 }
 
-#if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86)
+#if defined(CONFIG_X86)
 static void tsc_check_state(int state)
 {
         switch (boot_cpu_data.x86_vendor) {
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 26386a92f5aa..5b9ba4834ce1 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -72,7 +72,7 @@ config ATMEL_TCLIB
 
 config ATMEL_TCB_CLKSRC
         bool "TC Block Clocksource"
-        depends on ATMEL_TCLIB && GENERIC_TIME
+        depends on ATMEL_TCLIB
         default y
         help
           Select this to get a high precision clocksource based on a
@@ -240,7 +240,7 @@ config CS5535_MFGPT_DEFAULT_IRQ
 
 config CS5535_CLOCK_EVENT_SRC
         tristate "CS5535/CS5536 high-res timer (MFGPT) events"
-        depends on GENERIC_TIME && GENERIC_CLOCKEVENTS && CS5535_MFGPT
+        depends on GENERIC_CLOCKEVENTS && CS5535_MFGPT
         help
           This driver provides a clock event source based on the MFGPT
           timer(s) in the CS5535 and CS5536 companion chips.
diff --git a/kernel/time.c b/kernel/time.c
index 848b1c2ab09a..ba9b338d1835 100644
--- a/kernel/time.c
+++ b/kernel/time.c
@@ -300,22 +300,6 @@ struct timespec timespec_trunc(struct timespec t, unsigned gran)
 }
 EXPORT_SYMBOL(timespec_trunc);
 
-#ifndef CONFIG_GENERIC_TIME
-/*
- * Simulate gettimeofday using do_gettimeofday which only allows a timeval
- * and therefore only yields usec accuracy
- */
-void getnstimeofday(struct timespec *tv)
-{
-        struct timeval x;
-
-        do_gettimeofday(&x);
-        tv->tv_sec = x.tv_sec;
-        tv->tv_nsec = x.tv_usec * NSEC_PER_USEC;
-}
-EXPORT_SYMBOL_GPL(getnstimeofday);
-#endif
-
 /* Converts Gregorian date to seconds since 1970-01-01 00:00:00.
  * Assumes input in normal date format, i.e. 1980-12-31 23:59:59
  * => year=1980, mon=12, day=31, hour=23, min=59, sec=59.
diff --git a/kernel/time/Kconfig b/kernel/time/Kconfig
index 95ed42951e0a..f06a8a365648 100644
--- a/kernel/time/Kconfig
+++ b/kernel/time/Kconfig
@@ -6,7 +6,7 @@ config TICK_ONESHOT
 
 config NO_HZ
         bool "Tickless System (Dynamic Ticks)"
-        depends on GENERIC_TIME && GENERIC_CLOCKEVENTS
+        depends on !ARCH_USES_GETTIMEOFFSET && GENERIC_CLOCKEVENTS
         select TICK_ONESHOT
         help
           This option enables a tickless system: timer interrupts will
@@ -15,7 +15,7 @@ config NO_HZ
 
 config HIGH_RES_TIMERS
         bool "High Resolution Timer Support"
-        depends on GENERIC_TIME && GENERIC_CLOCKEVENTS
+        depends on !ARCH_USES_GETTIMEOFFSET && GENERIC_CLOCKEVENTS
         select TICK_ONESHOT
         help
           This option enables high resolution timer support. If your
diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index f08e99c1d561..c543d21b4e54 100644
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -531,7 +531,7 @@ static u64 clocksource_max_deferment(struct clocksource *cs)
         return max_nsecs - (max_nsecs >> 5);
 }
 
-#ifdef CONFIG_GENERIC_TIME
+#ifndef CONFIG_ARCH_USES_GETTIMEOFFSET
 
 /**
  * clocksource_select - Select the best clocksource available
@@ -577,7 +577,7 @@ static void clocksource_select(void)
         }
 }
 
-#else /* CONFIG_GENERIC_TIME */
+#else /* !CONFIG_ARCH_USES_GETTIMEOFFSET */
 
 static inline void clocksource_select(void) { }
 
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 623fe3d504dc..73edd4074b50 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -173,8 +173,6 @@ void timekeeping_leap_insert(int leapsecond)
         update_vsyscall(&xtime, timekeeper.clock, timekeeper.mult);
 }
 
-#ifdef CONFIG_GENERIC_TIME
-
 /**
  * timekeeping_forward_now - update clock to the current time
  *
@@ -376,52 +374,6 @@ void timekeeping_notify(struct clocksource *clock)
         tick_clock_notify();
 }
 
-#else /* GENERIC_TIME */
-
-static inline void timekeeping_forward_now(void) { }
-
-/**
- * ktime_get - get the monotonic time in ktime_t format
- *
- * returns the time in ktime_t format
- */
-ktime_t ktime_get(void)
-{
-        struct timespec now;
-
-        ktime_get_ts(&now);
-
-        return timespec_to_ktime(now);
-}
-EXPORT_SYMBOL_GPL(ktime_get);
-
-/**
- * ktime_get_ts - get the monotonic clock in timespec format
- * @ts:         pointer to timespec variable
- *
- * The function calculates the monotonic clock from the realtime
- * clock and the wall_to_monotonic offset and stores the result
- * in normalized timespec format in the variable pointed to by @ts.
- */
-void ktime_get_ts(struct timespec *ts)
-{
-        struct timespec tomono;
-        unsigned long seq;
-
-        do {
-                seq = read_seqbegin(&xtime_lock);
-                getnstimeofday(ts);
-                tomono = wall_to_monotonic;
-
-        } while (read_seqretry(&xtime_lock, seq));
-
-        set_normalized_timespec(ts, ts->tv_sec + tomono.tv_sec,
-                                ts->tv_nsec + tomono.tv_nsec);
-}
-EXPORT_SYMBOL_GPL(ktime_get_ts);
-
-#endif /* !GENERIC_TIME */
-
 /**
  * ktime_get_real - get the real (wall-) time in ktime_t format
  *
@@ -784,10 +736,11 @@ void update_wall_time(void)
                 return;
 
         clock = timekeeper.clock;
-#ifdef CONFIG_GENERIC_TIME
-        offset = (clock->read(clock) - clock->cycle_last) & clock->mask;
-#else
+
+#ifdef CONFIG_ARCH_USES_GETTIMEOFFSET
         offset = timekeeper.cycle_interval;
+#else
+        offset = (clock->read(clock) - clock->cycle_last) & clock->mask;
 #endif
         timekeeper.xtime_nsec = (s64)xtime.tv_nsec << timekeeper.shift;
 
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index 8b1797c4545b..7531ddaf3afe 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -153,7 +153,7 @@ config IRQSOFF_TRACER
         bool "Interrupts-off Latency Tracer"
         default n
         depends on TRACE_IRQFLAGS_SUPPORT
-        depends on GENERIC_TIME
+        depends on !ARCH_USES_GETTIMEOFFSET
         select TRACE_IRQFLAGS
         select GENERIC_TRACER
         select TRACER_MAX_TRACE
@@ -175,7 +175,7 @@ config IRQSOFF_TRACER
 config PREEMPT_TRACER
         bool "Preemption-off Latency Tracer"
         default n
-        depends on GENERIC_TIME
+        depends on !ARCH_USES_GETTIMEOFFSET
         depends on PREEMPT
         select GENERIC_TRACER
         select TRACER_MAX_TRACE