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Violators will be prosecuted; Thu, 10 May 2018 12:24:12 -0400 Received: from b01ledav004.gho.pok.ibm.com (b01ledav004.gho.pok.ibm.com [9.57.199.109]) by b01cxnp23033.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id w4AGOBNB62718180; Thu, 10 May 2018 16:24:11 GMT Received: from b01ledav004.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id D6175112047; Thu, 10 May 2018 12:24:07 -0400 (EDT) Received: from pacoca.ibmmodules.com (unknown [9.85.233.38]) by b01ledav004.gho.pok.ibm.com (Postfix) with ESMTP id 03FAA112040; Thu, 10 May 2018 12:24:06 -0400 (EDT) From: Jose Ricardo Ziviani To: kernel-team@lists.ubuntu.com Subject: [Bionic][PATCH v2 11/21] blk-mq: make sure that correct hctx->next_cpu is set Date: Thu, 10 May 2018 13:23:24 -0300 X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180510162334.2058-1-joserz@linux.vnet.ibm.com> References: <20180510162334.2058-1-joserz@linux.vnet.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 18051016-0040-0000-0000-000004299144 X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00009000; HX=3.00000241; KW=3.00000007; PH=3.00000004; SC=3.00000259; SDB=6.01030320; UDB=6.00526553; IPR=6.00809452; MB=3.00021032; MTD=3.00000008; XFM=3.00000015; UTC=2018-05-10 16:24:13 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18051016-0041-0000-0000-0000082FA091 Message-Id: <20180510162334.2058-12-joserz@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2018-05-10_06:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=1 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 impostorscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1709140000 definitions=main-1805100154 X-Mailman-Approved-At: Thu, 10 May 2018 16:35:59 +0000 X-BeenThere: kernel-team@lists.ubuntu.com X-Mailman-Version: 2.1.20 Precedence: list List-Id: Kernel team discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: kernel-team-bounces@lists.ubuntu.com Sender: "kernel-team" From: Ming Lei From commit 20e4d81393196 (blk-mq: simplify queue mapping & schedule with each possisble CPU), one hctx can be mapped from all offline CPUs, then hctx->next_cpu can be set as wrong. This patch fixes this issue by making hctx->next_cpu pointing to the first CPU in hctx->cpumask if all CPUs in hctx->cpumask are offline. Cc: Stefan Haberland Tested-by: Christian Borntraeger Reviewed-by: Christoph Hellwig Reviewed-by: Sagi Grimberg Fixes: 20e4d81393196 ("blk-mq: simplify queue mapping & schedule with each possisble CPU") Cc: stable@vger.kernel.org Signed-off-by: Ming Lei Signed-off-by: Jens Axboe (cherry picked from commit a1c735fb790745f94a359df45c11df4a69760389) Signed-off-by: Jose Ricardo Ziviani --- block/blk-mq.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/block/blk-mq.c b/block/blk-mq.c index f5e7624d6fe1..ce5a08e3c0f3 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -2280,6 +2280,8 @@ static void blk_mq_map_swqueue(struct request_queue *q) */ hctx->next_cpu = cpumask_first_and(hctx->cpumask, cpu_online_mask); + if (hctx->next_cpu >= nr_cpu_ids) + hctx->next_cpu = cpumask_first(hctx->cpumask); hctx->next_cpu_batch = BLK_MQ_CPU_WORK_BATCH; } }