netdev - Re: [PATCH] net/handshake: fix section mismatch error for handshake_genl_net

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Message-ID: <01A42FB6-9391-4E31-AF58-A522F284A893@oracle.com>
Date:   Fri, 21 Apr 2023 13:25:16 +0000
From:   Chuck Lever III <chuck.lever@...cle.com>
To:     Arnd Bergmann <arnd@...nel.org>
CC:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, Arnd Bergmann <arnd@...db.de>,
        "kernel-tls-handshake@...ts.linux.dev" 
        <kernel-tls-handshake@...ts.linux.dev>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] net/handshake: fix section mismatch error for
 handshake_genl_net_ops



> On Apr 21, 2023, at 4:24 AM, Arnd Bergmann <arnd@...nel.org> wrote:
> 
> From: Arnd Bergmann <arnd@...db.de>
> 
> The new netlink interface causes a link-time warning about the use of
> a discarded symbol:
> 
> WARNING: modpost: vmlinux.o: section mismatch in reference: handshake_exit (section: .exit.text) -> (unknown) (section: .init.data)
> ERROR: modpost: Section mismatches detected.
> 
> There are other instances of pernet_operations that are marked as
> __net_initdata as well, so I'm not sure what the lifetime rules are,
> but it's clear that any discarded symbol cannot be referenced from an
> exitcall, so remove that annotation here.
> 
> Fixes: 3b3009ea8abb ("net/handshake: Create a NETLINK service for handling handshake requests")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Thank you, Arnd. We received two other patches yesterday
with the same build error report and suggested fix.


> ---
> net/handshake/netlink.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/handshake/netlink.c b/net/handshake/netlink.c
> index 8ea0ff993f9f..35c9c445e0b8 100644
> --- a/net/handshake/netlink.c
> +++ b/net/handshake/netlink.c
> @@ -249,7 +249,7 @@ static void __net_exit handshake_net_exit(struct net *net)
> }
> }
> 
> -static struct pernet_operations __net_initdata handshake_genl_net_ops = {
> +static struct pernet_operations handshake_genl_net_ops = {
> .init = handshake_net_init,
> .exit = handshake_net_exit,
> .id = &handshake_net_id,
> -- 
> 2.39.2
> 

--
Chuck Lever