linux-kernel - Re: [PATCH] virtio_blk: temporary variable type tweak

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Message-ID: <Y6ISQGnxdW7RB0sN@fedora>
Date:   Tue, 20 Dec 2022 14:51:28 -0500
From:   Stefan Hajnoczi <stefanha@...hat.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     linux-kernel@...r.kernel.org, Jason Wang <jasowang@...hat.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Jens Axboe <axboe@...nel.dk>,
        virtualization@...ts.linux-foundation.org,
        linux-block@...r.kernel.org
Subject: Re: [PATCH] virtio_blk: temporary variable type tweak

On Tue, Dec 20, 2022 at 07:41:53AM -0500, Michael S. Tsirkin wrote:
> virtblk_result returns blk_status_t which is a bitwise restricted type,
> so we are not supposed to stuff it in a plain int temporary variable.
> All we do with it is pass it on to a function expecting blk_status_t so
> the generated code is ok, but we get warnings from sparse:
> 
> drivers/block/virtio_blk.c:326:36: sparse: sparse: incorrect type in initializer (different base types) @@     expected int status @@
> +got restricted blk_status_t @@
> drivers/block/virtio_blk.c:334:33: sparse: sparse: incorrect type in argument 2 (different base types) @@     expected restricted
> +blk_status_t [usertype] error @@     got int status @@
> 
> Make sparse happy by using the correct type.
> 
> Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> ---
>  drivers/block/virtio_blk.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Reviewed-by: Stefan Hajnoczi <stefanha@...hat.com>

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