tree 8a28455c583d2eff4b1c6afd55b46e23204d6749
parent a2dcbb32f0647a3b8230c146a2f980654a7738af
author Michael Neuling <mikey@neuling.org> 1360772497 +0000
committer Benjamin Herrenschmidt <benh@kernel.crashing.org> 1360907933 +1100

powerpc: Add reclaim and recheckpoint functions for context switching transactional memory processes

When we switch out a task, we need to save both the checkpointed and the
speculated state into the thread struct.

Similarly when we are switching in a task we need to load both the checkpointed
and speculated state.  If the task was using FP, we non-lazily reload both the
original and the speculative FP register states.  This is because the kernel
doesn't see if/when a TM rollback occurs, so if we take an FP unavoidable
later, we are unable to determine which set of FP regs need to be restored.

This simply adds these functions.  It doesn't hook them into the existing code
yet.

Signed-off-by: Matt Evans <matt@ozlabs.org>
Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>