linux-kernel - [PATCH 3.16.y-ckt 080/130] megaraid_sas: use raw_smp_processor

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Date:	Fri,  4 Sep 2015 14:07:48 +0100
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Christoph Hellwig <hch@....de>,
	James Bottomley <JBottomley@...n.com>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 080/130] megaraid_sas: use raw_smp_processor_id()

3.16.7-ckt17 -stable review patch.  If anyone has any objections, please let me know.

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

From: Christoph Hellwig <hch@...radead.org>

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@....de>
Reported-by: Andy Lutomirski <luto@...nel.org>
Tested-by: Andy Lutomirski <luto@...nel.org>
Acked-by: Sumit Saxena <sumit.saxena@...gotech.com>
Signed-off-by: James Bottomley <JBottomley@...n.com>
[ luis: backported to 3.16:
  - dropped changes to megasas_build_dcdb_fusion() ]
Signed-off-by: Luis Henriques <luis.henriques@...onical.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,
--
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