linux-kernel - Re: [PATCH] virtio_balloon: Fix unused label warning

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Date:   Sun, 16 Feb 2020 09:05:02 +0100
From:   David Hildenbrand <david@...hat.com>
To:     Nathan Chancellor <natechancellor@...il.com>
Cc:     Borislav Petkov <bp@...en8.de>,
        virtualization@...ts.linux-foundation.org,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>,
        David Hildenbrand <david@...hat.com>
Subject: Re: [PATCH] virtio_balloon: Fix unused label warning

> Am 16.02.2020 um 08:46 schrieb Nathan Chancellor <natechancellor@...il.com>:
> 
> On Mon, Feb 10, 2020 at 10:33:28AM +0100, Borislav Petkov wrote:
>> From: Borislav Petkov <bp@...e.de>
>> 
>> Fix
>> 
>>  drivers/virtio/virtio_balloon.c: In function ‘virtballoon_probe’:
>>  drivers/virtio/virtio_balloon.c:963:1: warning: label ‘out_del_vqs’ defined but not used [-Wunused-label]
>>    963 | out_del_vqs:
>>        | ^~
>> 
>> The CONFIG_BALLOON_COMPACTION ifdeffery should enclose it too.
>> 
>> Signed-off-by: Borislav Petkov <bp@...e.de>
>> Cc: David Hildenbrand <david@...hat.com>
>> ---
>> drivers/virtio/virtio_balloon.c | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>> 
>> diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c
>> index 7bfe365d9372..b6ed5f8bccb1 100644
>> --- a/drivers/virtio/virtio_balloon.c
>> +++ b/drivers/virtio/virtio_balloon.c
>> @@ -959,9 +959,9 @@ static int virtballoon_probe(struct virtio_device *vdev)
>>    iput(vb->vb_dev_info.inode);
>> out_kern_unmount:
>>    kern_unmount(balloon_mnt);
>> -#endif
>> out_del_vqs:
>>    vdev->config->del_vqs(vdev);
>> +#endif
> 
> I noticed the same issue and sent an almost identical patch [1] but I
> kept the call to del_vqs outside of the CONFIG_BALLOON_COMPACTION guard
> since it seems like that should still be called when that config is
> unset, as that was the case before commit 1ad6f58ea936 ("virtio_balloon:
> Fix memory leaks on errors in virtballoon_probe()"). Is this patch fully
> correct? I am not a virtio expert at all, just noticing from a brief
> reading of this function.

I think you are right and this splipped my eyes!