linux-kernel - Re: [PATCH rdma-rc] RDMA/netlink: Annotate unused function that is needed for compilation check

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Date:   Mon, 8 Nov 2021 08:36:39 -0400
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Leon Romanovsky <leon@...nel.org>
Cc:     Doug Ledford <dledford@...hat.com>,
        Leon Romanovsky <leonro@...dia.com>,
        kernel test robot <lkp@...el.com>,
        linux-kernel@...r.kernel.org, linux-rdma@...r.kernel.org
Subject: Re: [PATCH rdma-rc] RDMA/netlink: Annotate unused function that is
 needed for compilation check

On Sun, Nov 07, 2021 at 08:40:47AM +0200, Leon Romanovsky wrote:
> From: Leon Romanovsky <leonro@...dia.com>
> 
> >> drivers/infiniband/core/nldev.c:2543:1: warning: unused function '__chk_RDMA_NL_NLDEV'
>    MODULE_ALIAS_RDMA_NETLINK(RDMA_NL_NLDEV, 5);
>    ^
> 
> Fixes: e3bf14bdc17a ("rdma: Autoload netlink client modules")
> Reported-by: kernel test robot <lkp@...el.com>
> Signed-off-by: Leon Romanovsky <leonro@...dia.com>
> ---
>  include/rdma/rdma_netlink.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/include/rdma/rdma_netlink.h b/include/rdma/rdma_netlink.h
> index 2758d9df71ee..c2a79aeee113 100644
> --- a/include/rdma/rdma_netlink.h
> +++ b/include/rdma/rdma_netlink.h
> @@ -30,7 +30,7 @@ enum rdma_nl_flags {
>   * constant as well and the compiler checks they are the same.
>   */
>  #define MODULE_ALIAS_RDMA_NETLINK(_index, _val)                                \
> -	static inline void __chk_##_index(void)                                \
> +	static inline void __maybe_unused __chk_##_index(void)                 \
>  	{                                                                      \
>  		BUILD_BUG_ON(_index != _val);                                  \
>  	}                                                                      \

This is a compiler bug, static inline should never need maybe_unsed

Jason