[PATCH v2 0/2] powerpc: powerpc/vdso: Avoid link stack corruption in __get_datapage()

[Michael Neuling]

This patch fixes a link stack corruption issue in the VDOS
get_datapage() code and adds a benchmark to test it in future.

v2:
  - Split benchmark out of commit message and put in selftests.
  - Upgrade commit message to essay.