time: Revert ALWAYS_USE_PERSISTENT_CLOCK compile time optimizaitons

[~andy/linux] / arch / x86 / Kconfig

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 15b5cef4aa3857a386cb77cffd2ba74243b532c7..45c41249321f3ffaacdc733dabbdc9bd22e27648 100644 (file)
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -20,6 +20,7 @@ config X86_64
 ### Arch settings
 config X86
        def_bool y
+       select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
        select HAVE_AOUT if X86_32
        select HAVE_UNSTABLE_SCHED_CLOCK
        select ARCH_SUPPORTS_NUMA_BALANCING
@@ -107,7 +108,6 @@ config X86
        select GENERIC_CLOCKEVENTS_BROADCAST if X86_64 || (X86_32 && X86_LOCAL_APIC)
        select GENERIC_TIME_VSYSCALL if X86_64
        select KTIME_SCALAR if X86_32
-       select ALWAYS_USE_PERSISTENT_CLOCK
        select GENERIC_STRNCPY_FROM_USER
        select GENERIC_STRNLEN_USER
        select HAVE_CONTEXT_TRACKING if X86_64
@@ -120,6 +120,7 @@ config X86
        select OLD_SIGSUSPEND3 if X86_32 || IA32_EMULATION
        select OLD_SIGACTION if X86_32
        select COMPAT_OLD_SIGACTION if IA32_EMULATION
+       select RTC_LIB
 
 config INSTRUCTION_DECODER
        def_bool y
@@ -188,9 +189,6 @@ config GENERIC_CALIBRATE_DELAY
 config ARCH_HAS_CPU_RELAX
        def_bool y
 
-config ARCH_HAS_DEFAULT_IDLE
-       def_bool y
-
 config ARCH_HAS_CACHE_LINE_SIZE
        def_bool y
 
@@ -389,7 +387,7 @@ config X86_NUMACHIP
 
 config X86_VSMP
        bool "ScaleMP vSMP"
-       select PARAVIRT_GUEST
+       select HYPERVISOR_GUEST
        select PARAVIRT
        depends on X86_64 && PCI
        depends on X86_EXTENDED_PLATFORM
@@ -596,44 +594,17 @@ config SCHED_OMIT_FRAME_POINTER
 
          If in doubt, say "Y".
 
-menuconfig PARAVIRT_GUEST
-       bool "Paravirtualized guest support"
-       ---help---
-         Say Y here to get to see options related to running Linux under
-         various hypervisors.  This option alone does not add any kernel code.
-
-         If you say N, all options in this submenu will be skipped and disabled.
-
-if PARAVIRT_GUEST
-
-config PARAVIRT_TIME_ACCOUNTING
-       bool "Paravirtual steal time accounting"
-       select PARAVIRT
-       default n
+menuconfig HYPERVISOR_GUEST
+       bool "Linux guest support"
        ---help---
-         Select this option to enable fine granularity task steal time
-         accounting. Time spent executing other tasks in parallel with
-         the current vCPU is discounted from the vCPU power. To account for
-         that, there can be a small performance impact.
-
-         If in doubt, say N here.
-
-source "arch/x86/xen/Kconfig"
+         Say Y here to enable options for running Linux under various hyper-
+         visors. This option enables basic hypervisor detection and platform
+         setup.
 
-config KVM_GUEST
-       bool "KVM Guest support (including kvmclock)"
-       select PARAVIRT
-       select PARAVIRT
-       select PARAVIRT_CLOCK
-       default y if PARAVIRT_GUEST
-       ---help---
-         This option enables various optimizations for running under the KVM
-         hypervisor. It includes a paravirtualized clock, so that instead
-         of relying on a PIT (or probably other) emulation by the
-         underlying device model, the host provides the guest with
-         timing infrastructure such as time of day, and system time
+         If you say N, all options in this submenu will be skipped and
+         disabled, and Linux guest support won't be built in.
 
-source "arch/x86/lguest/Kconfig"
+if HYPERVISOR_GUEST
 
 config PARAVIRT
        bool "Enable paravirtualization code"
@@ -643,6 +614,13 @@ config PARAVIRT
          over full virtualization.  However, when run without a hypervisor
          the kernel is theoretically slower and slightly larger.
 
+config PARAVIRT_DEBUG
+       bool "paravirt-ops debugging"
+       depends on PARAVIRT && DEBUG_KERNEL
+       ---help---
+         Enable to debug paravirt_ops internals.  Specifically, BUG if
+         a paravirt_op is missing when it is called.
+
 config PARAVIRT_SPINLOCKS
        bool "Paravirtualization layer for spinlocks"
        depends on PARAVIRT && SMP
@@ -656,17 +634,38 @@ config PARAVIRT_SPINLOCKS
 
          If you are unsure how to answer this question, answer N.
 
-config PARAVIRT_CLOCK
-       bool
+source "arch/x86/xen/Kconfig"
 
-endif
+config KVM_GUEST
+       bool "KVM Guest support (including kvmclock)"
+       depends on PARAVIRT
+       select PARAVIRT_CLOCK
+       default y
+       ---help---
+         This option enables various optimizations for running under the KVM
+         hypervisor. It includes a paravirtualized clock, so that instead
+         of relying on a PIT (or probably other) emulation by the
+         underlying device model, the host provides the guest with
+         timing infrastructure such as time of day, and system time
 
-config PARAVIRT_DEBUG
-       bool "paravirt-ops debugging"
-       depends on PARAVIRT && DEBUG_KERNEL
+source "arch/x86/lguest/Kconfig"
+
+config PARAVIRT_TIME_ACCOUNTING
+       bool "Paravirtual steal time accounting"
+       depends on PARAVIRT
+       default n
        ---help---
-         Enable to debug paravirt_ops internals.  Specifically, BUG if
-         a paravirt_op is missing when it is called.
+         Select this option to enable fine granularity task steal time
+         accounting. Time spent executing other tasks in parallel with
+         the current vCPU is discounted from the vCPU power. To account for
+         that, there can be a small performance impact.
+
+         If in doubt, say N here.
+
+config PARAVIRT_CLOCK
+       bool
+
+endif #HYPERVISOR_GUEST
 
 config NO_BOOTMEM
        def_bool y