On 10/29/2012 07:54 AM, Marcelo Tosatti wrote:
> On Mon, Oct 29, 2012 at 06:18:20PM +0400, Glauber Costa wrote:
>> On 10/24/2012 05:13 PM, Marcelo Tosatti wrote:
>>> Index: vsyscall/arch/x86/Kconfig
>>> ===================================================================
>>> --- vsyscall.orig/arch/x86/Kconfig
>>> +++ vsyscall/arch/x86/Kconfig
>>> @@ -632,6 +632,13 @@ config PARAVIRT_SPINLOCKS
>>>
>>> config PARAVIRT_CLOCK
>>> bool
>>> +config PARAVIRT_CLOCK_VSYSCALL
>>> + bool "Paravirt clock vsyscall support"
>>> + depends on PARAVIRT_CLOCK && GENERIC_TIME_VSYSCALL
>>> + ---help---
>>> + Enable performance critical clock related system calls to
>>> + be executed in userspace, provided that the hypervisor
>>> + supports it.
>>>
>>> endif
>> Besides debugging, what is the point in having this as an
>> extra-selectable? Is there any case in which a virtual machine has code
>> for this, but may decide to run without it ?
> Don't think so (its pretty small anyway, the code).
>
>> I believe all this code in vsyscall should be wrapped in PARAVIRT_CLOCK
>> only.
> Unless Jeremy has a reason, i'm fine with that.
I often set up blind config variables for dependency management; I'm
guessing the "GENERIC_TIME_VSYSCALL" dependency is important. I think
the problem is that this exists, but that it's a user-selectable
option. Removing the prompt should fix that.
J
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