On 29/04/16 01:18, Christopher Covington wrote:

In order to share remap and unmap support for the VDSO with other
architectures without duplicating the code, we need a common name and type
for the address of the VDSO. An informal survey of the architectures
indicates unsigned long vdso is popular. Change the variable name in
powerpc from mm->context.vdso_base to simply mm->context.vdso.

Could you please provide additional details on why the remap/unmap operations are required?
This patch does rename, but should it abstract via a function acesss to vmap field using arch_* operations? Not sure

Balbir Singh