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

Message ID 1536781219-13938-4-git-send-email-leitao@debian.org
State RFC
Headers show
  • New TM Model
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Context Check Description
snowpatch_ozlabs/checkpatch success Test checkpatch on branch next
snowpatch_ozlabs/apply_patch success next/apply_patch Successfully applied

Commit Message

Breno Leitao Sept. 12, 2018, 7:40 p.m.
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

Signed-off-by: Breno Leitao <leitao@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))
+	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;