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, 3 insertions, 3 deletions

diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index eb870fcc29cc..cfceb6616ec1 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -2428,19 +2428,19 @@ static int __net_init xfrm_statistics_init(struct net *net)
 {
         int rv;
 
-        if (snmp_mib_init((void **)net->mib.xfrm_statistics,
+        if (snmp_mib_init((void __percpu **)net->mib.xfrm_statistics,
                           sizeof(struct linux_xfrm_mib)) < 0)
                 return -ENOMEM;
         rv = xfrm_proc_init(net);
         if (rv < 0)
-                snmp_mib_free((void **)net->mib.xfrm_statistics);
+                snmp_mib_free((void __percpu **)net->mib.xfrm_statistics);
         return rv;
 }
 
 static void xfrm_statistics_fini(struct net *net)
 {
         xfrm_proc_fini(net);
-        snmp_mib_free((void **)net->mib.xfrm_statistics);
+        snmp_mib_free((void __percpu **)net->mib.xfrm_statistics);
 }
 #else
 static int __net_init xfrm_statistics_init(struct net *net)