[RFC PATCH v2 8/8] arm64: Wire up and expose the new compat vDSO

On Thu, Oct 27, 2016 at 05:30:58PM +0100, Kevin Brodsky wrote:

* The vDSO page replaces the vector page. The vDSO provides its own
  sigreturn trampolines, replacing those in the vector page, but the
  kuser helpers are gone. As a result enabling the compat vDSO will
  break userspace programs relying on the kuser helpers.

I think vDSO and vectors page should not exclude each other. If you want
to disable the vectors page, let's make it an independent config option
like the KUSER_HELPERS in arch/arm64/mm/Kconfig. But I would very much
like to be able to have both the vDSO and the vectors page at the same
time.

-- 
Catalin