[3.16.y-ckt stable] Patch "powerpc/powernv: pr_warn_once on unsupported OPAL_MSG type" has been added to staging queue

[Luis Henriques]

This is a note to let you know that I have just added a patch titled

    powerpc/powernv: pr_warn_once on unsupported OPAL_MSG type

to the linux-3.16.y-queue branch of the 3.16.y-ckt extended stable tree 
which can be found at:

    http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-3.16.y-queue

This patch is scheduled to be released in version 3.16.7-ckt23.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.16.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

---8<------------------------------------------------------------

>From 4cdf41e664ef0e7206ffd74b88c10ed9c79d8140 Mon Sep 17 00:00:00 2001
From: Stewart Smith <stewart at linux.vnet.ibm.com>
Date: Fri, 11 Dec 2015 12:08:23 +1100
Subject: powerpc/powernv: pr_warn_once on unsupported OPAL_MSG type

commit 98da62b716a3b24ab8e77453c9a8a954124c18cd upstream.

When running on newer OPAL firmware that supports sending extra
OPAL_MSG types, we would print a warning on *every* message received.

This could be a problem for kernels that don't support OPAL_MSG_OCC
on machines that are running real close to thermal limits and the
OCC is throttling the chip. For a kernel that is paying attention to
the message queue, we could get these notifications quite often.

Conceivably, future message types could also come fairly often,
and printing that we didn't understand them 10,000 times provides
no further information than printing them once.

Signed-off-by: Stewart Smith <stewart at linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe at ellerman.id.au>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 arch/powerpc/platforms/powernv/opal.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/platforms/powernv/opal.c b/arch/powerpc/platforms/powernv/opal.c
index d5e5794db989..0fa7178d36dc 100644
--- a/arch/powerpc/platforms/powernv/opal.c
+++ b/arch/powerpc/platforms/powernv/opal.c
@@ -329,7 +329,7 @@ static void opal_handle_message(void)

 	/* Sanity check */
 	if (type >= OPAL_MSG_TYPE_MAX) {
-		pr_warning("%s: Unknown message type: %u\n", __func__, type);
+		pr_warn_once("%s: Unknown message type: %u\n", __func__, type);
 		return;
 	}
 	opal_message_do_notify(type, (void *)&msg);