Subject: Re: [PATCH] SUNRPC: Mark buffer used for debug printks with __maybe_unused

From: Joe Perches <[email-masked]>
Date: Wed, 20 Feb 2008 07:29:17 -0800

On Wed, 2008-02-20 at 17:02 +0300, Pavel Emelyanov wrote:
> There are tree places, which declare the char buf[...] on the stack
> to push it later into dprintk(). Since the dprintk sometimes (if the 
> CONFIG_SYSCTL=n) becomes an empty do { } while (0) stub, these buffers
> cause gcc to produce appropriate warnings.

What about the uses in fs?

fs/lockd/svc.c:         char buf[RPC_MAX_ADDRBUFLEN];
fs/lockd/svc4proc.c:            char buf[RPC_MAX_ADDRBUFLEN];
fs/lockd/svcproc.c:             char buf[RPC_MAX_ADDRBUFLEN];
fs/nfs/callback.c:      char buf[RPC_MAX_ADDRBUFLEN];
fs/nfsd/nfsfh.c:                char buf[RPC_MAX_ADDRBUFLEN];
fs/nfsd/nfsproc.c:              char buf[RPC_MAX_ADDRBUFLEN];

Perhaps there should be a DECLARE_RPC_BUF(buf) macro?

#define DECLARE_RPC_BUF(var) char var[MAC_BUF_SIZE] __maybe_unused