ktime: Kill non-scalar ktime_t implementation for 2038

The non-scalar ktime_t implementation is basically a timespec
which has to be changed to support dates past 2038 on 32bit
systems.

This patch removes the non-scalar ktime_t implementation, forcing
the scalar s64 nanosecond version on all architectures.

This may have additional performance overhead on some 32bit
systems when converting between ktime_t and timespec structures,
however the majority of 32bit systems (arm and i386) were already
using scalar ktime_t, so no performance regressions will be seen
on those platforms.

On affected platforms, I'm open to finding optimizations, including
avoiding converting to timespecs where possible.

[ tglx: We can now cleanup the ktime_t.tv64 mess, but thats a
  different issue and we can throw a coccinelle script at it ]

Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: John Stultz <john.stultz@linaro.org>

4 files changed, 0 insertions, 4 deletions

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 05a71511ab3c..b9f6728331c8 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -64,7 +64,6 @@ config ARM
         select HAVE_UID16
         select HAVE_VIRT_CPU_ACCOUNTING_GEN
         select IRQ_FORCED_THREADING
-        select KTIME_SCALAR
         select MODULES_USE_ELF_REL
         select NO_BOOTMEM
         select OLD_SIGACTION
diff --git a/arch/hexagon/Kconfig b/arch/hexagon/Kconfig
index 0fd6138f6203..4dc89d1f9c48 100644
--- a/arch/hexagon/Kconfig
+++ b/arch/hexagon/Kconfig
@@ -23,7 +23,6 @@ config HEXAGON
         select GENERIC_IOMAP
         select GENERIC_SMP_IDLE_THREAD
         select STACKTRACE_SUPPORT
-        select KTIME_SCALAR
         select GENERIC_CLOCKEVENTS
         select GENERIC_CLOCKEVENTS_BROADCAST
         select MODULES_USE_ELF_RELA
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index bb63499fc5d3..1afc7a686702 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -137,7 +137,6 @@ config S390
         select HAVE_SYSCALL_TRACEPOINTS
         select HAVE_UID16 if 32BIT
         select HAVE_VIRT_CPU_ACCOUNTING
-        select KTIME_SCALAR if 32BIT
         select MODULES_USE_ELF_RELA
         select NO_BOOTMEM
         select OLD_SIGACTION
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index a8f749ef0fdc..7fa17b5ce668 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -111,7 +111,6 @@ config X86
         select ARCH_CLOCKSOURCE_DATA
         select GENERIC_CLOCKEVENTS_BROADCAST if X86_64 || (X86_32 && X86_LOCAL_APIC)
         select GENERIC_TIME_VSYSCALL
-        select KTIME_SCALAR if X86_32
         select GENERIC_STRNCPY_FROM_USER
         select GENERIC_STRNLEN_USER
         select HAVE_CONTEXT_TRACKING if X86_64