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SubjectRe: Why disable vdso by default with CONFIG_PARAVIRT?
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:

unsigned int __read_mostly vdso_enabled = 0;
unsigned int __read_mostly vdso_enabled = 1;

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

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