Re: Why disable vdso by default with CONFIG_PARAVIRT?

Zachary Amsden wrote:

Jeremy Fitzhardinge wrote:

quoted

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