linux-kernel - Re: [PATCH v2 6/8] blk-mq: Rework blk_mq_realloc_hw

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Date:   Thu, 6 Oct 2016 13:11:32 +0300
From:   Sagi Grimberg <sagi@...mberg.me>
To:     Alexander Gordeev <agordeev@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-block@...r.kernel.org
Subject: Re: [PATCH v2 6/8] blk-mq: Rework blk_mq_realloc_hw_ctxs()



On 06/10/16 11:25, Alexander Gordeev wrote:
> On Thu, Oct 06, 2016 at 12:47:26AM +0300, Sagi Grimberg wrote:
>>
>>> @@ -1908,33 +1909,36 @@ static void blk_mq_realloc_hw_ctxs(struct blk_mq_tag_set *set,
>>> 		if (node == NUMA_NO_NODE)
>>> 			node = set->numa_node;
>>>
>>> -		hctxs[i] = kzalloc_node(sizeof(struct blk_mq_hw_ctx),
>>> -					GFP_KERNEL, node);
>>> -		if (!hctxs[i])
>>> +		hctx = kzalloc_node(sizeof(*hctx), GFP_KERNEL, node);
>>> +		if (!hctx)
>>> 			break;
>>>
>>> -		if (blk_mq_init_hctx(q, set, hctxs[i], i, node)) {
>>> -			kfree(hctxs[i]);
>>> -			hctxs[i] = NULL;
>>> +		if (blk_mq_init_hctx(q, set, hctx, i, node)) {
>>> +			kfree(hctx);
>>> 			break;
>>> 		}
>>> -		blk_mq_hctx_kobj_init(hctxs[i]);
>>> +
>>> +		blk_mq_hctx_kobj_init(hctx);
>>> +		hctxs[i] = hctx;
>>> 	}
>>> 	for (j = i; j < q->nr_hw_queues; j++) {
>>> -		struct blk_mq_hw_ctx *hctx = hctxs[j];
>>> +		hctx = hctxs[i];
>>
>> Didn't you mean hctx[j]?
>
> Surely, I did.
> Thanks!

Maybe it would be cleaner to do:

	while (--i >= 0) {
		hctx = hctxs[i];
		...
	}