This is a note to let you know that I've just added the patch titled
powerpc/kernel: Initialize load_tm on task creation
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
powerpc-kernel-initialize-load_tm-on-task-creation.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 7f22ced4377628074e2ac25f41a88f98eb3b03f1 Mon Sep 17 00:00:00 2001
From: Breno Leitao <leitao@xxxxxxxxxx>
Date: Mon, 5 Jun 2017 11:40:59 -0300
Subject: powerpc/kernel: Initialize load_tm on task creation
From: Breno Leitao <leitao@xxxxxxxxxx>
commit 7f22ced4377628074e2ac25f41a88f98eb3b03f1 upstream.
Currently tsk->thread.load_tm is not initialized in the task creation
and can contain garbage on a new task.
This is an undesired behaviour, since it affects the timing to enable
and disable the transactional memory laziness (disabling and enabling
the MSR TM bit, which affects TM reclaim and recheckpoint in the
scheduling process).
Fixes: 5d176f751ee3 ("powerpc: tm: Enable transactional memory (TM) lazily for userspace")
Signed-off-by: Breno Leitao <leitao@xxxxxxxxxx>
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/powerpc/kernel/process.c | 1 +
1 file changed, 1 insertion(+)
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -1680,6 +1680,7 @@ void start_thread(struct pt_regs *regs,
current->thread.tm_tfhar = 0;
current->thread.tm_texasr = 0;
current->thread.tm_tfiar = 0;
+ current->thread.load_tm = 0;
#endif /* CONFIG_PPC_TRANSACTIONAL_MEM */
}
EXPORT_SYMBOL(start_thread);
Patches currently in stable-queue which might be from leitao@xxxxxxxxxx are
queue-4.9/powerpc-kernel-fix-fp-and-vector-register-restoration.patch
queue-4.9/powerpc-kernel-initialize-load_tm-on-task-creation.patch