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| author | John Stultz <john.stultz@linaro.org> | 2014-07-16 21:03:53 +0000 |
|---|---|---|
| committer | John Stultz <john.stultz@linaro.org> | 2014-07-23 10:16:50 -0700 |
| commit | 24e4a8c3e8868874835b0f1ad6dd417341e99822 (patch) | |
| tree | d71c666cc53db7e0d906e838f23ff67855b86b6b /arch | |
| parent | 76f4108892d9a9e3408bba839914f97a54086a6f (diff) | |
| download | lwn-24e4a8c3e8868874835b0f1ad6dd417341e99822.tar.gz lwn-24e4a8c3e8868874835b0f1ad6dd417341e99822.zip | |
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/Kconfig | 1 | ||||
| -rw-r--r-- | arch/hexagon/Kconfig | 1 | ||||
| -rw-r--r-- | arch/s390/Kconfig | 1 | ||||
| -rw-r--r-- | arch/x86/Kconfig | 1 |
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 |