Re: 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:

#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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