[patch 0/2] Updates to compat VDSOs

[Jeremy Fitzhardinge]

Hi Andi,

Here's a couple of patches to fix up COMPAT_VDSO:

The first is a straightforward implementation of Jan's original idea
of relocating the VDSO to match its mapped location.  Unlike Jan and
Zach's version, I changed it to relocate based on the phdrs rather than
the sections; the result is pleasantly compact.

The second patch takes advantage of the fact that all the COMPAT_VDSO work
happens at runtime now, and allows compat mode to be enabled dynamically.
If you specify vdso=2 on the kernel command line, it comes up in compat
mode; vdso=1 is normal vdso mode, and vdso=0 disables vdso altogether.
You can also switch modes with sysctl.

Changes since last posting:
 - rebase sections as well as phdrs
 - relocate symbols
 - more robust DT_tag handling
 - handle dynamic compat mode switches a bit better

Thanks to Jan and Roland for the review.

Thanks,
	J

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