linux-kernel - [PATCH 4.9 096/119] powerpc/kernel: Initialize load

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Date:   Mon, 12 Jun 2017 17:25:58 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Breno Leitao <leitao@...ian.org>,
        Michael Ellerman <mpe@...erman.id.au>
Subject: [PATCH 4.9 096/119] powerpc/kernel: Initialize load_tm on task creation

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Breno Leitao <leitao@...ian.org>

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@...ian.org>
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 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);