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Message-ID: <3a3e4faa55324d576d9ab3d1f2e45889673ba1e8.camel@kernel.org>
Subject: Re: [PATCH 19/34] sunrpc: suppress warnings for unused procfs
 functions
From: Jeff Layton <jlayton@kernel.org>
To: Arnd Bergmann <arnd@kernel.org>, linux-kernel@vger.kernel.org, Trond
 Myklebust <trond.myklebust@hammerspace.com>, Anna Schumaker
 <anna@kernel.org>, Chuck Lever <chuck.lever@oracle.com>, "David S. Miller"
 <davem@davemloft.net>, Eric Dumazet <edumazet@google.com>, Jakub Kicinski
 <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>, NeilBrown
 <neilb@suse.de>, "J. Bruce Fields" <bfields@fieldses.org>
Cc: Arnd Bergmann <arnd@arndb.de>, Olga Kornievskaia <kolga@netapp.com>, Dai
 Ngo <Dai.Ngo@oracle.com>, Tom Talpey <tom@talpey.com>,
 linux-nfs@vger.kernel.org,  netdev@vger.kernel.org
Date: Wed, 03 Apr 2024 04:59:54 -0400
In-Reply-To: <20240403080702.3509288-20-arnd@kernel.org>
References: <20240403080702.3509288-1-arnd@kernel.org>
	 <20240403080702.3509288-20-arnd@kernel.org>
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On Wed, 2024-04-03 at 10:06 +0200, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@arndb.de>
>=20
> There is a warning about unused variables when building with W=3D1 and no=
 procfs:
>=20
> net/sunrpc/cache.c:1660:30: error: 'cache_flush_proc_ops' defined but not=
 used [-Werror=3Dunused-const-variable=3D]
>  1660 | static const struct proc_ops cache_flush_proc_ops =3D {
>       |                              ^~~~~~~~~~~~~~~~~~~~
> net/sunrpc/cache.c:1622:30: error: 'content_proc_ops' defined but not use=
d [-Werror=3Dunused-const-variable=3D]
>  1622 | static const struct proc_ops content_proc_ops =3D {
>       |                              ^~~~~~~~~~~~~~~~
> net/sunrpc/cache.c:1598:30: error: 'cache_channel_proc_ops' defined but n=
ot used [-Werror=3Dunused-const-variable=3D]
>  1598 | static const struct proc_ops cache_channel_proc_ops =3D {
>       |                              ^~~~~~~~~~~~~~~~~~~~~~
>=20
> These are used inside of an #ifdef, so replacing that with an
> IS_ENABLED() check lets the compiler see how they are used while
> still dropping them during dead code elimination.
>=20
> Fixes: dbf847ecb631 ("knfsd: allow cache_register to return error on fail=
ure")
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
>  net/sunrpc/cache.c | 10 +++-------
>  1 file changed, 3 insertions(+), 7 deletions(-)
>=20
> diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c
> index 95ff74706104..ab3a57965dc0 100644
> --- a/net/sunrpc/cache.c
> +++ b/net/sunrpc/cache.c
> @@ -1673,12 +1673,14 @@ static void remove_cache_proc_entries(struct cach=
e_detail *cd)
>  	}
>  }
> =20
> -#ifdef CONFIG_PROC_FS
>  static int create_cache_proc_entries(struct cache_detail *cd, struct net=
 *net)
>  {
>  	struct proc_dir_entry *p;
>  	struct sunrpc_net *sn;
> =20
> +	if (!IS_ENABLED(CONFIG_PROC_FS))
> +		return 0;
> +
>  	sn =3D net_generic(net, sunrpc_net_id);
>  	cd->procfs =3D proc_mkdir(cd->name, sn->proc_net_rpc);
>  	if (cd->procfs =3D=3D NULL)
> @@ -1706,12 +1708,6 @@ static int create_cache_proc_entries(struct cache_=
detail *cd, struct net *net)
>  	remove_cache_proc_entries(cd);
>  	return -ENOMEM;
>  }
> -#else /* CONFIG_PROC_FS */
> -static int create_cache_proc_entries(struct cache_detail *cd, struct net=
 *net)
> -{
> -	return 0;
> -}
> -#endif
> =20
>  void __init cache_initialize(void)
>  {

Reviewed-by: Jeff Layton <jlayton@kernel.org>