[3.16.y-ckt stable] Patch "megaraid_sas: use raw_smp_processor_id()" has been added to staging queue

[Luis Henriques]

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

    megaraid_sas: use raw_smp_processor_id()

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-ckt17.

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

------

>From 9eb4ac21e351c7be4d6872ae17700ccc7dba3f14 Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <hch at infradead.org>
Date: Wed, 15 Apr 2015 09:44:37 -0700
Subject: megaraid_sas: use raw_smp_processor_id()

commit 16b8528d20607925899b1df93bfd8fbab98d267c upstream.

We only want to steer the I/O completion towards a queue, but don't
actually access any per-CPU data, so the raw_ version is fine to use
and avoids the warnings when using smp_processor_id().

Signed-off-by: Christoph Hellwig <hch at lst.de>
Reported-by: Andy Lutomirski <luto at kernel.org>
Tested-by: Andy Lutomirski <luto at kernel.org>
Acked-by: Sumit Saxena <sumit.saxena at avagotech.com>
Signed-off-by: James Bottomley <JBottomley at Odin.com>
[ luis: backported to 3.16:
  - dropped changes to megasas_build_dcdb_fusion() ]
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 drivers/scsi/megaraid/megaraid_sas_fusion.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/megaraid/megaraid_sas_fusion.c b/drivers/scsi/megaraid/megaraid_sas_fusion.c
index 9872ccb28f1f..f16764bf9964 100644
--- a/drivers/scsi/megaraid/megaraid_sas_fusion.c
+++ b/drivers/scsi/megaraid/megaraid_sas_fusion.c
@@ -1500,11 +1500,11 @@ megasas_build_ldio_fusion(struct megasas_instance *instance,
 			fp_possible = io_info.fpOkForIo;
 	}

-	/* Use smp_processor_id() for now until cmd->request->cpu is CPU
+	/* Use raw_smp_processor_id() for now until cmd->request->cpu is CPU
 	   id by default, not CPU group id, otherwise all MSI-X queues won't
 	   be utilized */
 	cmd->request_desc->SCSIIO.MSIxIndex = instance->msix_vectors ?
-		smp_processor_id() % instance->msix_vectors : 0;
+		raw_smp_processor_id() % instance->msix_vectors : 0;

 	if (fp_possible) {
 		megasas_set_pd_lba(io_request, scp->cmd_len, &io_info, scp,