Patch "blk-mq: Always schedule hctx->next_cpu" has been added to the 4.4-stable tree

Patch "blk-mq: Always schedule hctx->next_cpu" has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    blk-mq: Always schedule hctx->next_cpu

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     blk-mq-always-schedule-hctx-next_cpu.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From c02ebfdddbafa9a6a0f52fbd715e6bfa229af9d3 Mon Sep 17 00:00:00 2001
From: Gabriel Krisman Bertazi <krisman@linux.vnet.ibm.com>
Date: Wed, 28 Sep 2016 00:24:24 -0300
Subject: blk-mq: Always schedule hctx->next_cpu

From: Gabriel Krisman Bertazi <krisman@linux.vnet.ibm.com>

commit c02ebfdddbafa9a6a0f52fbd715e6bfa229af9d3 upstream.

Commit 0e87e58bf60e ("blk-mq: improve warning for running a queue on the
wrong CPU") attempts to avoid triggering the WARN_ON in
__blk_mq_run_hw_queue when the expected CPU is dead.  Problem is, in the
last batch execution before round robin, blk_mq_hctx_next_cpu can
schedule a dead CPU and also update next_cpu to the next alive CPU in
the mask, which will trigger the WARN_ON despite the previous
workaround.

The following patch fixes this scenario by always scheduling the value
in hctx->next_cpu.  This changes the moment when we round-robin the CPU
running the hctx, but it really doesn't matter, since it still executes
BLK_MQ_CPU_WORK_BATCH times in a row before switching to another CPU.

Fixes: 0e87e58bf60e ("blk-mq: improve warning for running a queue on the wrong CPU")
Signed-off-by: Gabriel Krisman Bertazi <krisman@linux.vnet.ibm.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 block/blk-mq.c |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -842,7 +842,7 @@ static int blk_mq_hctx_next_cpu(struct b
 		return WORK_CPU_UNBOUND;
 
 	if (--hctx->next_cpu_batch <= 0) {
-		int cpu = hctx->next_cpu, next_cpu;
+		int next_cpu;
 
 		next_cpu = cpumask_next(hctx->next_cpu, hctx->cpumask);
 		if (next_cpu >= nr_cpu_ids)
@@ -850,8 +850,6 @@ static int blk_mq_hctx_next_cpu(struct b
 
 		hctx->next_cpu = next_cpu;
 		hctx->next_cpu_batch = BLK_MQ_CPU_WORK_BATCH;
-
-		return cpu;
 	}
 
 	return hctx->next_cpu;


Patches currently in stable-queue which might be from krisman@linux.vnet.ibm.com are

queue-4.4/blk-mq-always-schedule-hctx-next_cpu.patch