[RFC,04/11] powerpc/tm: Always set TIF_RESTORE_TM on reclaim

Message ID 1536781219-13938-5-git-send-email-leitao@debian.org
State RFC
Headers show
  • New TM Model
Related show


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.
If the task data was reclaimed (through TM_KERNEL_ENTRY), then it needs to
be recheckpointed later, once exiting to userspace. The recheckpoint is
done by restore_tm_state() function, which is called on our way to
userspace if the task has the TIF_RESTORE_TM flag set.

This patch makes sure the task has TIF_RESTORE_TM tag set every time there
is a reclaim, so, a recheckpoint will be executed later.

Signed-off-by: Breno Leitao <leitao@debian.org>
 arch/powerpc/kernel/process.c | 3 +++
 1 file changed, 3 insertions(+)


diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index f22f82ce174c..54fddf03b97a 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -891,6 +891,9 @@  static void tm_reclaim_thread(struct thread_struct *thr, uint8_t cause)
 	tm_reclaim(thr, cause);
+	/* Tag it so restore_tm_state will pay attention to this task */
+	set_thread_flag(TIF_RESTORE_TM);
 	 * If we are in a transaction and FP is off then we can't have
 	 * used FP inside that transaction. Hence the checkpointed