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Diffstat (limited to '')
| -rw-r--r-- | debian/patches-rt/0179-block-mq-do-not-invoke-preempt_disable.patch | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/debian/patches-rt/0179-block-mq-do-not-invoke-preempt_disable.patch b/debian/patches-rt/0179-block-mq-do-not-invoke-preempt_disable.patch new file mode 100644 index 000000000..c6d47b2d4 --- /dev/null +++ b/debian/patches-rt/0179-block-mq-do-not-invoke-preempt_disable.patch @@ -0,0 +1,58 @@ +From 438290ebaac377f499a9c17e07ffa735ff6db1c2 Mon Sep 17 00:00:00 2001 +From: Sebastian Andrzej Siewior <bigeasy@linutronix.de> +Date: Tue, 14 Jul 2015 14:26:34 +0200 +Subject: [PATCH 179/347] block/mq: do not invoke preempt_disable() +Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.246-rt110.tar.xz + +preempt_disable() and get_cpu() don't play well together with the sleeping +locks it tries to allocate later. +It seems to be enough to replace it with get_cpu_light() and migrate_disable(). + +Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> +--- + block/blk-mq.c | 10 +++++----- + 1 file changed, 5 insertions(+), 5 deletions(-) + +diff --git a/block/blk-mq.c b/block/blk-mq.c +index ffa97d90bde9..ea41d67e4db5 100644 +--- a/block/blk-mq.c ++++ b/block/blk-mq.c +@@ -570,7 +570,7 @@ static void __blk_mq_complete_request(struct request *rq) + return; + } + +- cpu = get_cpu(); ++ cpu = get_cpu_light(); + if (!test_bit(QUEUE_FLAG_SAME_FORCE, &rq->q->queue_flags)) + shared = cpus_share_cache(cpu, ctx->cpu); + +@@ -582,7 +582,7 @@ static void __blk_mq_complete_request(struct request *rq) + } else { + rq->q->softirq_done_fn(rq); + } +- put_cpu(); ++ put_cpu_light(); + } + + static void hctx_unlock(struct blk_mq_hw_ctx *hctx, int srcu_idx) +@@ -1387,14 +1387,14 @@ static void __blk_mq_delay_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async, + return; + + if (!async && !(hctx->flags & BLK_MQ_F_BLOCKING)) { +- int cpu = get_cpu(); ++ int cpu = get_cpu_light(); + if (cpumask_test_cpu(cpu, hctx->cpumask)) { + __blk_mq_run_hw_queue(hctx); +- put_cpu(); ++ put_cpu_light(); + return; + } + +- put_cpu(); ++ put_cpu_light(); + } + + kblockd_mod_delayed_work_on(blk_mq_hctx_next_cpu(hctx), &hctx->run_work, +-- +2.36.1 + |