linux-kernel - [PATCH 3.16 10/19] fs/nfs: fix new compiler warning about boolean in switch

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Date:   Sat, 01 Apr 2017 14:17:50 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Arnd Bergmann" <arnd@...db.de>,
        "Trond Myklebust" <trond.myklebust@...marydata.com>,
        "Andre Przywara" <andre.przywara@....com>
Subject: [PATCH 3.16 10/19] fs/nfs: fix new compiler warning about boolean
 in switch

3.16.43-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Andre Przywara <andre.przywara@....com>

commit c7757074839f2cd440521482d76ea180d0d4bdac upstream.

The brand new GCC 5.1.0 warns by default on using a boolean in the
switch condition. This results in the following warning:

fs/nfs/nfs4proc.c: In function 'nfs4_proc_get_rootfh':
fs/nfs/nfs4proc.c:3100:10: warning: switch condition has boolean value [-Wswitch-bool]
  switch (auth_probe) {
          ^

This code was obviously using switch to make use of the fall-through
semantics (without the usual comment, though).
Rewrite that code using if statements to avoid the warning and make
the code a bit more readable on the way.

Signed-off-by: Andre Przywara <andre.przywara@....com>
Signed-off-by: Trond Myklebust <trond.myklebust@...marydata.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
Cc: Arnd Bergmann <arnd@...db.de>
---
 fs/nfs/nfs4proc.c | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -3000,16 +3000,13 @@ int nfs4_proc_get_rootfh(struct nfs_serv
 			 struct nfs_fsinfo *info,
 			 bool auth_probe)
 {
-	int status;
+	int status = 0;
 
-	switch (auth_probe) {
-	case false:
+	if (!auth_probe)
 		status = nfs4_lookup_root(server, fhandle, info);
-		if (status != -NFS4ERR_WRONGSEC)
-			break;
-	default:
+
+	if (auth_probe || status == NFS4ERR_WRONGSEC)
 		status = nfs4_do_find_root_sec(server, fhandle, info);
-	}
 
 	if (status == 0)
 		status = nfs4_server_capabilities(server, fhandle);