percpu: add __percpu sparse annotations to net

Add __percpu sparse annotations to net.

These annotations are to make sparse consider percpu variables to be
in a different address space and warn if accessed without going
through percpu accessors.  This patch doesn't affect normal builds.

The macro and type tricks around snmp stats make things a bit
interesting.  DEFINE/DECLARE_SNMP_STAT() macros mark the target field
as __percpu and SNMP_UPD_PO_STATS() macro is updated accordingly.  All
snmp_mib_*() users which used to cast the argument to (void **) are
updated to cast it to (void __percpu **).

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: David S. Miller <davem@davemloft.net>
Cc: Patrick McHardy <kaber@trash.net>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Cc: Vlad Yasevich <vladislav.yasevich@hp.com>
Cc: netdev@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 1 deletions

diff --git a/include/net/neighbour.h b/include/net/neighbour.h
index 7834f470d14a..da1d58be31b7 100644
--- a/include/net/neighbour.h
+++ b/include/net/neighbour.h
@@ -164,7 +164,7 @@ struct neigh_table {
         rwlock_t                lock;
         unsigned long           last_rand;
         struct kmem_cache               *kmem_cachep;
-        struct neigh_statistics *stats;
+        struct neigh_statistics __percpu *stats;
         struct neighbour        **hash_buckets;
         unsigned int            hash_mask;
         __u32                   hash_rnd;