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ipv4: ipconfig: avoid unused ic_proto_used symbol 

When CONFIG_PROC_FS, CONFIG_IP_PNP_BOOTP, CONFIG_IP_PNP_DHCP and
CONFIG_IP_PNP_RARP are all disabled, we get a warning about the
ic_proto_used variable being unused:

net/ipv4/ipconfig.c:146:12: error: 'ic_proto_used' defined but not used [-Werror=unused-variable]

This avoids the warning, by making the definition conditional on
whether a dynamic IP configuration protocol is configured. If not,
we know that the value is always zero, so we can optimize away the
variable and all code that depends on it.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Arnd Bergmann 2016-01-28 17:39:24 +01:00 committed by David S. Miller
parent 0260a2f4e2
commit 52b79e2bdf
1 changed files with 4 additions and 0 deletions
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net/ipv4/ipconfig.c
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@ -143,7 +143,11 @@ static char dhcp_client_identifier[253] __initdata;
/* Persistent data: */
#ifdef IPCONFIG_DYNAMIC
static int ic_proto_used; /* Protocol used, if any */
#else
#define ic_proto_used 0
#endif
static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
static u8 ic_domain[64]; /* DNS (not NIS) domain name */