[RFC PATCH 03/11] powerpc/tm: Recheckpoint when exiting from kernel

[Breno Leitao]

This is the only place we are going to recheckpoint now. Now the task
needs to have TIF_RESTORE_TM flag set, which will get into
restore_tm_state() and execute the recheckpoint if MSR shows that the
transaction was active.

Every time a task is required to recheckpoint, or just have the TM SPRs
restore, the TIF_RESTORE_TM flag should be set and the task MSR should
properly be in a transactional state, which will be checked by
restore_tm_state().

Signed-off-by: Breno Leitao <lei...@debian.org>
---
 arch/powerpc/kernel/process.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index 913c5725cdb2..f22f82ce174c 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -1069,6 +1069,10 @@ void restore_tm_state(struct pt_regs *regs)
        if (!MSR_TM_ACTIVE(regs->msr))
                return;
 
+       tm_enable();
+       /* The only place we recheckpoint */
+       tm_recheckpoint(&current->thread);
+
        msr_diff = current->thread.ckpt_regs.msr & ~regs->msr;
        msr_diff &= MSR_FP | MSR_VEC | MSR_VSX;
 
-- 
2.19.0