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authorGabriel Krisman Bertazi <krisman@linux.vnet.ibm.com>2016-09-28 00:24:24 -0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-01-19 20:17:22 +0100
commit6e8210ad2585ba8292d91374e2d0750dd45773e9 (patch)
tree1e935f2d01dd0ac511372254c942e518449dc029
parentddf0c377bf8204848cec783b6dd3b5c809ed00cd (diff)
blk-mq: Always schedule hctx->next_cpu
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>
-rw-r--r--block/blk-mq.c4
1 files changed, 1 insertions, 3 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 9f99a01b00e8..6cfc6b200366 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -842,7 +842,7 @@ static int blk_mq_hctx_next_cpu(struct blk_mq_hw_ctx *hctx)
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 blk_mq_hw_ctx *hctx)
hctx->next_cpu = next_cpu;
hctx->next_cpu_batch = BLK_MQ_CPU_WORK_BATCH;
-
- return cpu;
}
return hctx->next_cpu;