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")
diff --git a/Documentation/feature-removal-schedule.txt b/Documentation/feature-removal-schedule.txt
index 6fdb837..71f0fea 100644
--- a/Documentation/feature-removal-schedule.txt
+++ b/Documentation/feature-removal-schedule.txt
@@ -445,16 +445,6 @@
----------------------------
-What: xtime, wall_to_monotonic
-When: 2.6.36+
-Files: kernel/time/timekeeping.c include/linux/time.h
-Why: Cleaning up timekeeping internal values. Please use
- existing timekeeping accessor functions to access
- the equivalent functionality.
-Who: John Stultz <johnstul@us.ibm.com>
-
-----------------------------
-
What: KVM paravirt mmu host support
When: January 2011
Why: The paravirt mmu host support is slower than non-paravirt mmu, both
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index cbd4059..71d2863 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -73,7 +73,6 @@
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.
@@ -470,7 +469,7 @@
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 3e2e540..b9647bb 100644
--- a/arch/alpha/Kconfig
+++ b/arch/alpha/Kconfig
@@ -47,10 +47,6 @@
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 e39caa8..9e10882 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -43,10 +43,6 @@
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 f2b3193..f515727 100644
--- a/arch/avr32/Kconfig
+++ b/arch/avr32/Kconfig
@@ -45,9 +45,6 @@
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 f66294b..c88fd35 100644
--- a/arch/blackfin/Kconfig
+++ b/arch/blackfin/Kconfig
@@ -614,9 +614,6 @@
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 e25bf44..887ef85 100644
--- a/arch/cris/Kconfig
+++ b/arch/cris/Kconfig
@@ -20,9 +20,6 @@
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 4b5830b..16399bd 100644
--- a/arch/frv/Kconfig
+++ b/arch/frv/Kconfig
@@ -40,10 +40,6 @@
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 53cc669..988b6ff 100644
--- a/arch/h8300/Kconfig
+++ b/arch/h8300/Kconfig
@@ -62,10 +62,6 @@
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 9561082..8711d13 100644
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -82,10 +82,6 @@
bool
default y
-config GENERIC_TIME
- bool
- default y
-
config GENERIC_TIME_VSYSCALL
bool
default y
diff --git a/arch/ia64/kernel/time.c b/arch/ia64/kernel/time.c
index 653b3c4..ed6f22e 100644
--- a/arch/ia64/kernel/time.c
+++ b/arch/ia64/kernel/time.c
@@ -471,7 +471,8 @@
{
}
-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 @@
/* 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/m32r/Kconfig b/arch/m32r/Kconfig
index 3a9319f..836abbb 100644
--- a/arch/m32r/Kconfig
+++ b/arch/m32r/Kconfig
@@ -44,9 +44,6 @@
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 2e3737b..8030e24 100644
--- a/arch/m68k/Kconfig
+++ b/arch/m68k/Kconfig
@@ -59,9 +59,6 @@
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 efeb603..2609c39 100644
--- a/arch/m68knommu/Kconfig
+++ b/arch/m68knommu/Kconfig
@@ -63,10 +63,6 @@
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 9bd64b4..692fdfc 100644
--- a/arch/microblaze/Kconfig
+++ b/arch/microblaze/Kconfig
@@ -51,9 +51,6 @@
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 36642df..3ad59dd 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -758,10 +758,6 @@
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 1c4565a..444b9f9 100644
--- a/arch/mn10300/Kconfig
+++ b/arch/mn10300/Kconfig
@@ -46,9 +46,6 @@
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 05a366a..907417d 100644
--- a/arch/parisc/Kconfig
+++ b/arch/parisc/Kconfig
@@ -66,10 +66,6 @@
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 e2bf40a..631e5a0 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -29,9 +29,6 @@
config GENERIC_CMOS_UPDATE
def_bool y
-config GENERIC_TIME
- def_bool y
-
config GENERIC_TIME_VSYSCALL
def_bool y
diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c
index ccb8759..ce53dfa 100644
--- a/arch/powerpc/kernel/time.c
+++ b/arch/powerpc/kernel/time.c
@@ -796,36 +796,10 @@
return (cycle_t)get_tb();
}
-static inline void update_gtod(u64 new_tb_stamp, u64 new_stamp_xsec,
- u64 new_tb_to_xs, struct timespec *now,
- u32 frac_sec)
+void update_vsyscall(struct timespec *wall_time, struct timespec *wtm,
+ struct clocksource *clock, u32 mult)
{
- /*
- * tb_update_count is used to allow the userspace gettimeofday code
- * to assure itself that it sees a consistent view of the tb_to_xs and
- * stamp_xsec variables. It reads the tb_update_count, then reads
- * tb_to_xs and stamp_xsec and then reads tb_update_count again. If
- * the two values of tb_update_count match and are even then the
- * tb_to_xs and stamp_xsec values are consistent. If not, then it
- * loops back and reads them again until this criteria is met.
- * We expect the caller to have done the first increment of
- * vdso_data->tb_update_count already.
- */
- vdso_data->tb_orig_stamp = new_tb_stamp;
- 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->stamp_xtime = *now;
- vdso_data->stamp_sec_fraction = frac_sec;
- smp_wmb();
- ++(vdso_data->tb_update_count);
-}
-
-void update_vsyscall(struct timespec *wall_time, struct clocksource *clock,
- u32 mult)
-{
- u64 t2x, stamp_xsec;
+ u64 new_tb_to_xs, new_stamp_xsec;
u32 frac_sec;
if (clock != &clocksource_timebase)
@@ -837,15 +811,35 @@
/* XXX this assumes clock->shift == 22 */
/* 4611686018 ~= 2^(20+64-22) / 1e9 */
- t2x = (u64) mult * 4611686018ULL;
- stamp_xsec = (u64) wall_time->tv_nsec * XSEC_PER_SEC;
- do_div(stamp_xsec, 1000000000);
- stamp_xsec += (u64) wall_time->tv_sec * XSEC_PER_SEC;
+ new_tb_to_xs = (u64) mult * 4611686018ULL;
+ new_stamp_xsec = (u64) wall_time->tv_nsec * XSEC_PER_SEC;
+ do_div(new_stamp_xsec, 1000000000);
+ new_stamp_xsec += (u64) wall_time->tv_sec * XSEC_PER_SEC;
BUG_ON(wall_time->tv_nsec >= NSEC_PER_SEC);
/* this is tv_nsec / 1e9 as a 0.32 fraction */
frac_sec = ((u64) wall_time->tv_nsec * 18446744073ULL) >> 32;
- update_gtod(clock->cycle_last, stamp_xsec, t2x, wall_time, frac_sec);
+
+ /*
+ * tb_update_count is used to allow the userspace gettimeofday code
+ * to assure itself that it sees a consistent view of the tb_to_xs and
+ * stamp_xsec variables. It reads the tb_update_count, then reads
+ * tb_to_xs and stamp_xsec and then reads tb_update_count again. If
+ * the two values of tb_update_count match and are even then the
+ * tb_to_xs and stamp_xsec values are consistent. If not, then it
+ * loops back and reads them again until this criteria is met.
+ * We expect the caller to have done the first increment of
+ * vdso_data->tb_update_count already.
+ */
+ 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 = wtm->tv_sec;
+ vdso_data->wtom_clock_nsec = wtm->tv_nsec;
+ vdso_data->stamp_xtime = *wall_time;
+ vdso_data->stamp_sec_fraction = frac_sec;
+ smp_wmb();
+ ++(vdso_data->tb_update_count);
}
void update_vsyscall_tz(void)
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index bee1c0f..f0777a4 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -40,9 +40,6 @@
config GENERIC_HWEIGHT
def_bool y
-config GENERIC_TIME
- def_bool y
-
config GENERIC_TIME_VSYSCALL
def_bool y
diff --git a/arch/s390/kernel/time.c b/arch/s390/kernel/time.c
index 15a7536..2896cac 100644
--- a/arch/s390/kernel/time.c
+++ b/arch/s390/kernel/time.c
@@ -207,8 +207,8 @@
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 @@
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/score/Kconfig b/arch/score/Kconfig
index 55d413e..be4a155 100644
--- a/arch/score/Kconfig
+++ b/arch/score/Kconfig
@@ -55,9 +55,6 @@
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 82868fe..33990fa 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -98,9 +98,6 @@
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 ba068c8..491e9d6 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -67,9 +67,6 @@
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 0d207e7..7c8e277 100644
--- a/arch/um/Kconfig.common
+++ b/arch/um/Kconfig.common
@@ -55,10 +55,6 @@
default y
depends on BUG
-config GENERIC_TIME
- bool
- default y
-
config GENERIC_CLOCKEVENTS
bool
default y
diff --git a/arch/um/kernel/time.c b/arch/um/kernel/time.c
index c8b9c46..a08d9fa 100644
--- a/arch/um/kernel/time.c
+++ b/arch/um/kernel/time.c
@@ -102,16 +102,16 @@
clockevents_register_device(&itimer_clockevent);
}
+void read_persistent_clock(struct timespec *ts)
+{
+ long long nsecs = os_nsecs();
+
+ set_normalized_timespec(ts, nsecs / NSEC_PER_SEC,
+ nsecs % NSEC_PER_SEC);
+}
+
void __init time_init(void)
{
- long long nsecs;
-
timer_init();
-
- nsecs = os_nsecs();
- set_normalized_timespec(&wall_to_monotonic, -nsecs / NSEC_PER_SEC,
- -nsecs % NSEC_PER_SEC);
- set_normalized_timespec(&xtime, nsecs / NSEC_PER_SEC,
- nsecs % NSEC_PER_SEC);
late_time_init = setup_itimer;
}
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 6f77afa..baa34e5 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -73,9 +73,6 @@
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 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 ba390d7..33dbcc4 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 @@
.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 int hpet_clocksource_register(void)
{
u64 start, now;
+ u64 hpet_freq;
cycle_t t1;
/* Start the counter */
@@ -832,9 +831,15 @@
* 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 9faf91a..ce8e502 100644
--- a/arch/x86/kernel/tsc.c
+++ b/arch/x86/kernel/tsc.c
@@ -751,7 +751,6 @@
.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 @@
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 @@
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 1c0c6ab..dcbb28c 100644
--- a/arch/x86/kernel/vsyscall_64.c
+++ b/arch/x86/kernel/vsyscall_64.c
@@ -73,8 +73,8 @@
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 @@
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 @@
* 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;
diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig
index ebe228d..0859bfd 100644
--- a/arch/xtensa/Kconfig
+++ b/arch/xtensa/Kconfig
@@ -48,9 +48,6 @@
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 91874e0..ae47344 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -101,7 +101,9 @@
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 446aced..b76848c 100644
--- a/drivers/acpi/acpi_pad.c
+++ b/drivers/acpi/acpi_pad.c
@@ -77,7 +77,7 @@
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 eead3f5..b4c2f3b 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -264,7 +264,7 @@
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/clocksource/acpi_pm.c b/drivers/clocksource/acpi_pm.c
index 72a633a..cfb0f52 100644
--- a/drivers/clocksource/acpi_pm.c
+++ b/drivers/clocksource/acpi_pm.c
@@ -68,10 +68,7 @@
.rating = 200,
.read = acpi_pm_read,
.mask = (cycle_t)ACPI_PM_MASK,
- .mult = 0, /*to be calculated*/
- .shift = 22,
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
-
};
@@ -190,9 +187,6 @@
if (!pmtmr_ioport)
return -ENODEV;
- clocksource_acpi_pm.mult = clocksource_hz2mult(PMTMR_TICKS_PER_SEC,
- clocksource_acpi_pm.shift);
-
/* "verify" this timing source: */
for (j = 0; j < ACPI_PM_MONOTONICITY_CHECKS; j++) {
udelay(100 * j);
@@ -220,7 +214,8 @@
if (verify_pmtmr_rate() != 0)
return -ENODEV;
- return clocksource_register(&clocksource_acpi_pm);
+ return clocksource_register_hz(&clocksource_acpi_pm,
+ PMTMR_TICKS_PER_SEC);
}
/* We use fs_initcall because we want the PCI fixups to have run
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 9b089df..488f254 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -72,7 +72,7 @@
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_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/include/linux/clocksource.h b/include/linux/clocksource.h
index 5ea3c60..c37b21a 100644
--- a/include/linux/clocksource.h
+++ b/include/linux/clocksource.h
@@ -292,6 +292,8 @@
*/
extern int
__clocksource_register_scale(struct clocksource *cs, u32 scale, u32 freq);
+extern void
+__clocksource_updatefreq_scale(struct clocksource *cs, u32 scale, u32 freq);
static inline int clocksource_register_hz(struct clocksource *cs, u32 hz)
{
@@ -303,6 +305,15 @@
return __clocksource_register_scale(cs, 1000, khz);
}
+static inline void __clocksource_updatefreq_hz(struct clocksource *cs, u32 hz)
+{
+ __clocksource_updatefreq_scale(cs, 1, hz);
+}
+
+static inline void __clocksource_updatefreq_khz(struct clocksource *cs, u32 khz)
+{
+ __clocksource_updatefreq_scale(cs, 1000, khz);
+}
static inline void
clocksource_calc_mult_shift(struct clocksource *cs, u32 freq, u32 minsec)
@@ -313,11 +324,13 @@
#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/include/linux/time.h b/include/linux/time.h
index ea3559f0..cb34e35 100644
--- a/include/linux/time.h
+++ b/include/linux/time.h
@@ -76,9 +76,25 @@
const unsigned int min, const unsigned int sec);
extern void set_normalized_timespec(struct timespec *ts, time_t sec, s64 nsec);
+
+/*
+ * timespec_add_safe assumes both values are positive and checks
+ * for overflow. It will return TIME_T_MAX if the reutrn would be
+ * smaller then either of the arguments.
+ */
extern struct timespec timespec_add_safe(const struct timespec lhs,
const struct timespec rhs);
+
+static inline struct timespec timespec_add(struct timespec lhs,
+ struct timespec rhs)
+{
+ struct timespec ts_delta;
+ set_normalized_timespec(&ts_delta, lhs.tv_sec + rhs.tv_sec,
+ lhs.tv_nsec + rhs.tv_nsec);
+ return ts_delta;
+}
+
/*
* sub = lhs - rhs, in normalized form
*/
@@ -97,8 +113,6 @@
#define timespec_valid(ts) \
(((ts)->tv_sec >= 0) && (((unsigned long) (ts)->tv_nsec) < NSEC_PER_SEC))
-extern struct timespec xtime;
-extern struct timespec wall_to_monotonic;
extern seqlock_t xtime_lock;
extern void read_persistent_clock(struct timespec *ts);
@@ -110,7 +124,8 @@
unsigned long get_seconds(void);
struct timespec current_kernel_time(void);
-struct timespec __current_kernel_time(void); /* does not hold xtime_lock */
+struct timespec __current_kernel_time(void); /* does not take xtime_lock */
+struct timespec __get_wall_to_monotonic(void); /* does not take xtime_lock */
struct timespec get_monotonic_coarse(void);
#define CURRENT_TIME (current_kernel_time())
diff --git a/kernel/debug/kdb/kdb_main.c b/kernel/debug/kdb/kdb_main.c
index 8577e45..28b8441 100644
--- a/kernel/debug/kdb/kdb_main.c
+++ b/kernel/debug/kdb/kdb_main.c
@@ -2548,6 +2548,7 @@
*/
static int kdb_summary(int argc, const char **argv)
{
+ struct timespec now;
struct kdb_tm tm;
struct sysinfo val;
@@ -2562,7 +2563,8 @@
kdb_printf("domainname %s\n", init_uts_ns.name.domainname);
kdb_printf("ccversion %s\n", __stringify(CCVERSION));
- kdb_gmtime(&xtime, &tm);
+ now = __current_kernel_time();
+ kdb_gmtime(&now, &tm);
kdb_printf("date %04d-%02d-%02d %02d:%02d:%02d "
"tz_minuteswest %d\n",
1900+tm.tm_year, tm.tm_mon+1, tm.tm_mday,
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index e934339..ce66917 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -90,7 +90,7 @@
do {
seq = read_seqbegin(&xtime_lock);
xts = __current_kernel_time();
- tom = wall_to_monotonic;
+ tom = __get_wall_to_monotonic();
} while (read_seqretry(&xtime_lock, seq));
xtim = timespec_to_ktime(xts);
@@ -608,7 +608,7 @@
static void retrigger_next_event(void *arg)
{
struct hrtimer_cpu_base *base;
- struct timespec realtime_offset;
+ struct timespec realtime_offset, wtm;
unsigned long seq;
if (!hrtimer_hres_active())
@@ -616,10 +616,9 @@
do {
seq = read_seqbegin(&xtime_lock);
- set_normalized_timespec(&realtime_offset,
- -wall_to_monotonic.tv_sec,
- -wall_to_monotonic.tv_nsec);
+ wtm = __get_wall_to_monotonic();
} while (read_seqretry(&xtime_lock, seq));
+ set_normalized_timespec(&realtime_offset, -wtm.tv_sec, -wtm.tv_nsec);
base = &__get_cpu_var(hrtimer_bases);
diff --git a/kernel/time.c b/kernel/time.c
index 848b1c2..ba9b338 100644
--- a/kernel/time.c
+++ b/kernel/time.c
@@ -300,22 +300,6 @@
}
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 95ed429..f06a8a3 100644
--- a/kernel/time/Kconfig
+++ b/kernel/time/Kconfig
@@ -6,7 +6,7 @@
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 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 f08e99c..c18d7ef 100644
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -531,7 +531,7 @@
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 @@
}
}
-#else /* CONFIG_GENERIC_TIME */
+#else /* !CONFIG_ARCH_USES_GETTIMEOFFSET */
static inline void clocksource_select(void) { }
@@ -639,6 +639,32 @@
#define MAX_UPDATE_LENGTH 5 /* Seconds */
/**
+ * __clocksource_updatefreq_scale - Used update clocksource with new freq
+ * @t: clocksource to be registered
+ * @scale: Scale factor multiplied against freq to get clocksource hz
+ * @freq: clocksource frequency (cycles per second) divided by scale
+ *
+ * This should only be called from the clocksource->enable() method.
+ *
+ * This *SHOULD NOT* be called directly! Please use the
+ * clocksource_updatefreq_hz() or clocksource_updatefreq_khz helper functions.
+ */
+void __clocksource_updatefreq_scale(struct clocksource *cs, u32 scale, u32 freq)
+{
+ /*
+ * Ideally we want to use some of the limits used in
+ * clocksource_max_deferment, to provide a more informed
+ * MAX_UPDATE_LENGTH. But for now this just gets the
+ * register interface working properly.
+ */
+ clocks_calc_mult_shift(&cs->mult, &cs->shift, freq,
+ NSEC_PER_SEC/scale,
+ MAX_UPDATE_LENGTH*scale);
+ cs->max_idle_ns = clocksource_max_deferment(cs);
+}
+EXPORT_SYMBOL_GPL(__clocksource_updatefreq_scale);
+
+/**
* __clocksource_register_scale - Used to install new clocksources
* @t: clocksource to be registered
* @scale: Scale factor multiplied against freq to get clocksource hz
@@ -652,17 +678,10 @@
int __clocksource_register_scale(struct clocksource *cs, u32 scale, u32 freq)
{
- /*
- * Ideally we want to use some of the limits used in
- * clocksource_max_deferment, to provide a more informed
- * MAX_UPDATE_LENGTH. But for now this just gets the
- * register interface working properly.
- */
- clocks_calc_mult_shift(&cs->mult, &cs->shift, freq,
- NSEC_PER_SEC/scale,
- MAX_UPDATE_LENGTH*scale);
- cs->max_idle_ns = clocksource_max_deferment(cs);
+ /* Intialize mult/shift and max_idle_ns */
+ __clocksource_updatefreq_scale(cs, scale, freq);
+ /* Add clocksource to the clcoksource list */
mutex_lock(&clocksource_mutex);
clocksource_enqueue(cs);
clocksource_select();
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index caf8d4d..e14c839 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -153,8 +153,8 @@
* - wall_to_monotonic is no longer the boot time, getboottime must be
* used instead.
*/
-struct timespec xtime __attribute__ ((aligned (16)));
-struct timespec wall_to_monotonic __attribute__ ((aligned (16)));
+static struct timespec xtime __attribute__ ((aligned (16)));
+static struct timespec wall_to_monotonic __attribute__ ((aligned (16)));
static struct timespec total_sleep_time;
/*
@@ -170,11 +170,10 @@
{
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);
}
-#ifdef CONFIG_GENERIC_TIME
-
/**
* timekeeping_forward_now - update clock to the current time
*
@@ -328,7 +327,8 @@
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);
@@ -376,52 +376,6 @@
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
*
@@ -579,9 +533,9 @@
if (timespec_compare(&ts, &timekeeping_suspend_time) > 0) {
ts = timespec_sub(ts, timekeeping_suspend_time);
- xtime = timespec_add_safe(xtime, ts);
+ xtime = timespec_add(xtime, ts);
wall_to_monotonic = timespec_sub(wall_to_monotonic, ts);
- total_sleep_time = timespec_add_safe(total_sleep_time, ts);
+ total_sleep_time = timespec_add(total_sleep_time, ts);
}
/* re-base the last cycle value */
timekeeper.clock->cycle_last = timekeeper.clock->read(timekeeper.clock);
@@ -784,10 +738,11 @@
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;
@@ -856,7 +811,8 @@
}
/* 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);
}
/**
@@ -887,7 +843,7 @@
*/
void monotonic_to_bootbased(struct timespec *ts)
{
- *ts = timespec_add_safe(*ts, total_sleep_time);
+ *ts = timespec_add(*ts, total_sleep_time);
}
EXPORT_SYMBOL_GPL(monotonic_to_bootbased);
@@ -902,6 +858,11 @@
return xtime;
}
+struct timespec __get_wall_to_monotonic(void)
+{
+ return wall_to_monotonic;
+}
+
struct timespec current_kernel_time(void)
{
struct timespec now;
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index c7683fd..6eb97bb 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -153,7 +153,7 @@
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 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