linux-kernel - Re: [PATCH v13 5/5] virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE

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Date:   Thu, 03 Aug 2017 20:28:11 +0800
From:   Wei Wang <wei.w.wang@...el.com>
To:     Pankaj Gupta <pagupta@...hat.com>
CC:     linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org,
        linux-mm@...ck.org, mst@...hat.com, mhocko@...nel.org,
        mawilcox@...rosoft.com, akpm@...ux-foundation.org,
        virtio-dev@...ts.oasis-open.org, david@...hat.com,
        cornelia huck <cornelia.huck@...ibm.com>,
        mgorman@...hsingularity.net, aarcange@...hat.com,
        amit shah <amit.shah@...hat.com>, pbonzini@...hat.com,
        liliang opensource <liliang.opensource@...il.com>,
        yang zhang wz <yang.zhang.wz@...il.com>,
        quan xu <quan.xu@...yun.com>
Subject: Re: [PATCH v13 5/5] virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_VQ

On 08/03/2017 04:13 PM, Pankaj Gupta wrote:
>>
>> +        /* Allocate space for find_vqs parameters */
>> +        vqs = kcalloc(nvqs, sizeof(*vqs), GFP_KERNEL);
>> +        if (!vqs)
>> +                goto err_vq;
>> +        callbacks = kmalloc_array(nvqs, sizeof(*callbacks), GFP_KERNEL);
>> +        if (!callbacks)
>> +                goto err_callback;
>> +        names = kmalloc_array(nvqs, sizeof(*names), GFP_KERNEL);
>                      
>         is size here (integer) intentional?


Sorry, I didn't get it. Could you please elaborate more?


>
>> +        if (!names)
>> +                goto err_names;
>> +
>> +        callbacks[0] = balloon_ack;
>> +        names[0] = "inflate";
>> +        callbacks[1] = balloon_ack;
>> +        names[1] = "deflate";
>> +
>> +        i = 2;
>> +        if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_STATS_VQ)) {
>> +                callbacks[i] = stats_request;
> just thinking if memory for callbacks[3] & names[3] is allocated?


Yes, the above kmalloc_array allocated them.


Best,
Wei