linux-kernel - Re: [PATCH] virtio_pmem: fix sparse warning

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Message-ID: <20190711134403-mutt-send-email-mst@kernel.org>
Date:   Thu, 11 Jul 2019 13:45:36 -0400
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Pankaj Gupta <pagupta@...hat.com>
Cc:     virtualization@...ts.linux-foundation.org,
        dan.j.williams@...el.com, yuval.shaia@...cle.com,
        linux-nvdimm@...ts.01.org, linux-kernel@...r.kernel.org,
        cohuck@...hat.com, lcapitulino@...hat.com
Subject: Re: [PATCH] virtio_pmem: fix sparse warning

On Wed, Jul 10, 2019 at 07:57:00PM +0530, Pankaj Gupta wrote:
> This patch fixes below sparse warning related to __virtio 
> type in virtio pmem driver. This is reported by Intel test
> bot on linux-next tree.
> 
> nd_virtio.c:56:28: warning: incorrect type in assignment (different base types)
> nd_virtio.c:56:28:    expected unsigned int [unsigned] [usertype] type
> nd_virtio.c:56:28:    got restricted __virtio32
> nd_virtio.c:93:59: warning: incorrect type in argument 2 (different base types)
> nd_virtio.c:93:59:    expected restricted __virtio32 [usertype] val
> nd_virtio.c:93:59:    got unsigned int [unsigned] [usertype] ret
> 
> Signed-off-by: Pankaj Gupta <pagupta@...hat.com>
> Reported-by: kbuild test robot <lkp@...el.com>
> ---
> 
> This fixes a warning, so submitting it as a separate
> patch on top of virtio pmem series. 
>  
>  include/uapi/linux/virtio_pmem.h | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/include/uapi/linux/virtio_pmem.h b/include/uapi/linux/virtio_pmem.h
> index efcd72f2d20d..f89129bf1f84 100644
> --- a/include/uapi/linux/virtio_pmem.h
> +++ b/include/uapi/linux/virtio_pmem.h
> @@ -23,12 +23,12 @@ struct virtio_pmem_config {
>  
>  struct virtio_pmem_resp {
>  	/* Host return status corresponding to flush request */
> -	__u32 ret;
> +	__virtio32 ret;
>  };
>  
>  struct virtio_pmem_req {
>  	/* command type */
> -	__u32 type;
> +	__virtio32 type;
>  };
>  
>  #endif

req/resp are in memory right?
Then this looks like a wrong fix.
The accessors should all use cpu_to/from_le
and they types should be __le32.

> -- 
> 2.20.1