netdev - Re: [PATCH] amd-xgbe: fix mismatched prototype

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Date:   Sat, 4 Feb 2023 14:18:51 +0100
From:   Simon Horman <simon.horman@...igine.com>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Shyam Sundar S K <Shyam-sundar.S-k@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Raju Rangoju <Raju.Rangoju@....com>,
        Arnd Bergmann <arnd@...db.de>,
        Tom Lendacky <thomas.lendacky@....com>,
        Andrew Lunn <andrew@...n.ch>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] amd-xgbe: fix mismatched prototype

On Fri, Feb 03, 2023 at 01:15:36PM +0100, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> The forward declaration was introduced with a prototype that does
> not match the function definition:
> 
> drivers/net/ethernet/amd/xgbe/xgbe-phy-v2.c:2166:13: error: conflicting types for 'xgbe_phy_perform_ratechange' due to enum/integer mismatch; have 'void(struct xgbe_prv_data *, enum xgbe_mb_cmd,  enum xgbe_mb_subcmd)' [-Werror=enum-int-mismatch]
>  2166 | static void xgbe_phy_perform_ratechange(struct xgbe_prv_data *pdata,
>       |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~
> drivers/net/ethernet/amd/xgbe/xgbe-phy-v2.c:391:13: note: previous declaration of 'xgbe_phy_perform_ratechange' with type 'void(struct xgbe_prv_data *, unsigned int,  unsigned int)'
>   391 | static void xgbe_phy_perform_ratechange(struct xgbe_prv_data *pdata,
>       |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> Ideally there should not be any forward declarations here, which
> would make it easier to show that there is no unbounded recursion.
> I tried fixing this but could not figure out how to avoid the
> recursive call.
> 
> As a hotfix, address only the broken prototype to fix the build
> problem instead.
> 
> Fixes: 4f3b20bfbb75 ("amd-xgbe: add support for rx-adaptation")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Reviewed-by: Simon Horman <simon.horman@...igine.com>