tree 5d2bf3efea21bedf6a0df86b66f4c420fd06190e
parent f63e6d89876034c21ecd18bb1cd0d6c5b8da11a5
author Michael Ellerman <mpe@ellerman.id.au> 1458817444 +1100
committer Michael Ellerman <mpe@ellerman.id.au> 1460612826 +1000

powerpc/livepatch: Add livepatch stack to struct thread_info

In order to support live patching we need to maintain an alternate
stack of TOC & LR values. We use the base of the stack for this, and
store the "live patch stack pointer" in struct thread_info.

Unlike the other fields of thread_info, we can not statically initialise
that value, so it must be done at run time.

This patch just adds the code to support that, it is not enabled until
the next patch which actually adds live patch support.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Acked-by: Balbir Singh <bsingharora@gmail.com>