Re: Why disable vdso by default with CONFIG_PARAVIRT?

[Jeremy Fitzhardinge]

Zachary Amsden wrote:
> Jeremy Fitzhardinge wrote:
>> Hi Andi,
>>
>> What problem do they cause together?  There's certainly no problem with
>> Xen+vdso (in fact, its actually very useful so that it picks up the
>> right libc with Xen-friendly TLS).
>>   
>
> Methinks the compat VDSO support got broken in the config?  Paravirt +
> COMPAT_VDSO are incompatible. 

Yes, that's true, but I'm looking at arch/i386/kernel/sysenter.c:

#ifdef CONFIG_PARAVIRT
unsigned int __read_mostly vdso_enabled = 0;
#else
unsigned int __read_mostly vdso_enabled = 1;
#endif

I can't think of any reason why that should be necessary.

    J
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