linux-kernel - Re: [PATCH] net: decnet: fix build error due to incompatible pointer type, in dn_dst

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Message-ID: <222170f6-0095-4930-b6b7-cc309ba45ac1@kernel.org>
Date: Sat, 24 Jan 2026 13:33:24 -0700
From: David Ahern <dsahern@...nel.org>
To: Carlos Bilbao <carlos.bilbao@...bdal.com>, davem@...emloft.net,
 kuba@...nel.org, jmaxwell37@...il.com,
 linux-decnet-user@...ts.sourceforge.net
Cc: linux-kernel@...r.kernel.org, netdev@...r.kernel.org, bilbao@...edu
Subject: Re: [PATCH] net: decnet: fix build error due to incompatible pointer
 type, in dn_dst_gc

On 1/23/26 4:23 PM, Carlos Bilbao wrote:
> Update the signature of dn_dst_gc() to return void instead of int.
> 
> This change is required because the .gc member of struct dst_ops was
> updated to a void return type in a previous commit [1]. This leads to the
> following build error:
> 
> net/decnet/dn_route.c:132:10: error: initialization of 'void (*)(struct dst_ops *)' from incompatible pointer type 'int (*)(struct dst_ops *)' [-Werror=incompatible-pointer-types]
> 
> Note that dst_alloc() inside net/core/dst.c was already updated to
> ignore the return value of this callback.
> 
> [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=af6d10345ca76670c1b7c37799f0d5576ccef277
> 
> Fixes: af6d10345ca7 ("ipv6: remove max_size check inline with ipv4")
> Signed-off-by: Carlos Bilbao (Lambda) <carlos.bilbao@...nel.org>
> ---
>  net/decnet/dn_route.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 

commit 1202cdd665315c525b5237e96e0bedc76d7e754f
Author: Stephen Hemminger <stephen@...workplumber.org>
Date:   Wed Aug 17 17:43:21 2022 -0700

    Remove DECnet support from kernel