linux-kernel - Re: [PATCH] IB/hfi1: Add explicit cast OPA_MTU_8192 to 'enum ib

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Date:   Thu, 2 Jul 2020 11:26:16 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Nathan Chancellor <natechancellor@...il.com>
CC:     Mike Marciniszyn <mike.marciniszyn@...el.com>,
        Dennis Dalessandro <dennis.dalessandro@...el.com>,
        Doug Ledford <dledford@...hat.com>,
        <linux-rdma@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <clang-built-linux@...glegroups.com>
Subject: Re: [PATCH] IB/hfi1: Add explicit cast OPA_MTU_8192 to 'enum ib_mtu'

On Mon, Jun 22, 2020 at 05:52:24PM -0700, Nathan Chancellor wrote:
> Clang warns:
> 
> drivers/infiniband/hw/hfi1/qp.c:198:9: warning: implicit conversion from
> enumeration type 'enum opa_mtu' to different enumeration type 'enum
> ib_mtu' [-Wenum-conversion]
>                 mtu = OPA_MTU_8192;
>                     ~ ^~~~~~~~~~~~
> 1 warning generated.
> 
> enum opa_mtu extends enum ib_mtu. There are typically two ways to deal
> with this:
> 
> * Remove the expected types and just use 'int' for all parameters and
>   types.
> 
> * Explicitly cast the enums between each other.
> 
> This driver chooses to do the later so do the same thing here.
> 
> Fixes: 6d72344cf6c4 ("IB/ipoib: Increase ipoib Datagram mode MTU's upper limit")
> Link: https://github.com/ClangBuiltLinux/linux/issues/1062
> Link: https://lore.kernel.org/linux-rdma/20200527040350.GA3118979@ubuntu-s3-xlarge-x86/
> Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
> Acked-by: Dennis Dalessandro <dennis.dalessandro@...el.com>
> ---
>  drivers/infiniband/hw/hfi1/qp.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Applied to for-rc, thanks

Jason