linux-kernel - [PATCH] [v2] NFSD: hide unused svcxdr

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Message-Id: <20180122210919.1257261-1-arnd@arndb.de>
Date:   Mon, 22 Jan 2018 22:09:12 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     "J. Bruce Fields" <bfields@...ldses.org>,
        Jeff Layton <jlayton@...nel.org>
Cc:     Rasmus Villemoes <rasmus.villemoes@...vas.dk>,
        Arnd Bergmann <arnd@...db.de>,
        Chuck Lever <chuck.lever@...cle.com>,
        Trond Myklebust <trond.myklebust@...marydata.com>,
        Kinglong Mee <kinglongmee@...il.com>,
        linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] [v2] NFSD: hide unused svcxdr_dupstr()

There is now only one caller left for svcxdr_dupstr() and this is inside
of an #ifdef, so we can get a warning when the option is disabled:

fs/nfsd/nfs4xdr.c:241:1: error: 'svcxdr_dupstr' defined but not used [-Werror=unused-function]

This changes the remaining caller to use a nicer IS_ENABLED() check,
which lets the compiler drop the unused code silently.

Fixes: e40d99e6183e ("NFSD: Clean up symlink argument XDR decoders")
Suggested-by: Rasmus Villemoes <rasmus.villemoes@...vas.dk>
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
v2: use IS_ENABLED() instead of an #ifdef
---
 fs/nfsd/nfs4xdr.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index f51c9cccaf78..86a1a2450376 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -455,8 +455,8 @@ nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
 	}
 
 	label->len = 0;
-#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
-	if (bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
+	if (IS_ENABLED(CONFIG_NFSD_V4_SECURITY_LABEL) &&
+	    bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
 		READ_BUF(4);
 		len += 4;
 		dummy32 = be32_to_cpup(p++); /* lfs: we don't use it */
@@ -476,7 +476,6 @@ nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
 		if (!label->data)
 			return nfserr_jukebox;
 	}
-#endif
 	if (bmval[2] & FATTR4_WORD2_MODE_UMASK) {
 		if (!umask)
 			goto xdr_error;
-- 
2.9.0