linux-kernel - Re: [PATCH -next v3 2/2] sunrpc: Use no

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Date:   Mon, 16 Oct 2023 17:16:03 -0400
From:   Benjamin Coddington <bcodding@...hat.com>
To:     Geert Uytterhoeven <geert+renesas@...der.be>
Cc:     Trond Myklebust <trond.myklebust@...merspace.com>,
        Anna Schumaker <anna@...nel.org>,
        Chuck Lever <chuck.lever@...cle.com>,
        Jeff Layton <jlayton@...nel.org>, Neil Brown <neilb@...e.de>,
        Olga Kornievskaia <kolga@...app.com>,
        Dai Ngo <Dai.Ngo@...cle.com>, Tom Talpey <tom@...pey.com>,
        linux-nfs@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next v3 2/2] sunrpc: Use no_printk() in dfprintk*()
 dummies

On 16 Oct 2023, at 9:09, Geert Uytterhoeven wrote:

> When building NFS with W=1 and CONFIG_WERROR=y, but
> CONFIG_SUNRPC_DEBUG=n:
>
>     fs/nfs/nfs4proc.c: In function ‘nfs4_proc_create_session’:
>     fs/nfs/nfs4proc.c:9276:19: error: variable ‘ptr’ set but not used [-Werror=unused-but-set-variable]
>      9276 |         unsigned *ptr;
> 	  |                   ^~~
>       CC      fs/nfs/callback.o
>     fs/nfs/callback.c: In function ‘nfs41_callback_svc’:
>     fs/nfs/callback.c:98:13: error: variable ‘error’ set but not used [-Werror=unused-but-set-variable]
>        98 |         int error;
> 	  |             ^~~~~
>       CC      fs/nfs/flexfilelayout/flexfilelayout.o
>     fs/nfs/flexfilelayout/flexfilelayout.c: In function ‘ff_layout_io_track_ds_error’:
>     fs/nfs/flexfilelayout/flexfilelayout.c:1230:13: error: variable ‘err’ set but not used [-Werror=unused-but-set-variable]
>      1230 |         int err;
> 	  |             ^~~
>       CC      fs/nfs/flexfilelayout/flexfilelayoutdev.o
>     fs/nfs/flexfilelayout/flexfilelayoutdev.c: In function ‘nfs4_ff_alloc_deviceid_node’:
>     fs/nfs/flexfilelayout/flexfilelayoutdev.c:55:16: error: variable ‘ret’ set but not used [-Werror=unused-but-set-variable]
>        55 |         int i, ret = -ENOMEM;
> 	  |                ^~~
>
> All these are due to variables that are set unconditionally, but are
> used only when debugging is enabled.
>
> Fix this by changing the dfprintk*() dummy macros from empty loops to
> calls to the no_printk() helper.  This informs the compiler that the
> passed debug parameters are actually used, and enables format specifier
> checking as a bonus.
>
> This requires removing the protection by CONFIG_SUNRPC_DEBUG of the
> declaration of nlmdbg_cookie2a() in fs/lockd/svclock.c, as its reference
> is now visible to the compiler, but optimized away.
>
> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
> Acked-by: Jeff Layton <jlayton@...nel.org>

Reviewed-by: Benjamin Coddington <bcodding@...hat.com>

Ben