netdev - [PATCH net-next] net: make u64_stats

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Message-ID: <1434163488.27504.122.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Fri, 12 Jun 2015 19:44:48 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev <netdev@...r.kernel.org>
Subject: [PATCH net-next] net: make u64_stats_init() a function

From: Eric Dumazet <edumazet@...gle.com>

Using a function instead of a macro is cleaner and remove
following W=1 warnings (extract)

In file included from net/ipv6/ip6_vti.c:29:0:
net/ipv6/ip6_vti.c: In function ‘vti6_dev_init_gen’:
include/linux/netdevice.h:2029:18: warning: variable ‘stat’ set but not
used [-Wunused-but-set-variable]
    typeof(type) *stat;   \
                  ^
net/ipv6/ip6_vti.c:862:16: note: in expansion of macro
‘netdev_alloc_pcpu_stats’
  dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
                ^
  CC [M]  net/ipv6/sit.o
In file included from net/ipv6/sit.c:30:0:
net/ipv6/sit.c: In function ‘ipip6_tunnel_init’:
include/linux/netdevice.h:2029:18: warning: variable ‘stat’ set but not
used [-Wunused-but-set-variable]
    typeof(type) *stat;   \
                  ^

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 include/linux/u64_stats_sync.h |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/include/linux/u64_stats_sync.h b/include/linux/u64_stats_sync.h
index 4b4439e75f45f8e915f0ffb6b855be5f1113a04f..df89c9bcba7db8dbde3bbf2b99f9af6ed562b112 100644
--- a/include/linux/u64_stats_sync.h
+++ b/include/linux/u64_stats_sync.h
@@ -68,11 +68,12 @@ struct u64_stats_sync {
 };
 
 
+static inline void u64_stats_init(struct u64_stats_sync *syncp)
+{
 #if BITS_PER_LONG == 32 && defined(CONFIG_SMP)
-# define u64_stats_init(syncp)	seqcount_init(syncp.seq)
-#else
-# define u64_stats_init(syncp)	do { } while (0)
+	seqcount_init(&syncp->seq);
 #endif
+}
 
 static inline void u64_stats_update_begin(struct u64_stats_sync *syncp)
 {


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