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authorTejun Heo <tj@kernel.org>2010-02-16 15:20:26 +0000
committerDavid S. Miller <davem@davemloft.net>2010-02-16 23:05:38 -0800
commit7d720c3e4f0c4fc152a6bf17e24244a3c85412d2 (patch)
tree36e037187ce79acb211702bea22e99c625787757 /include/net/snmp.h
parent2bb4646fce8d09916b351d1a62f98db7cec6fc41 (diff)
downloadop-kernel-dev-7d720c3e4f0c4fc152a6bf17e24244a3c85412d2.zip
op-kernel-dev-7d720c3e4f0c4fc152a6bf17e24244a3c85412d2.tar.gz
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>
Diffstat (limited to 'include/net/snmp.h')
-rw-r--r--include/net/snmp.h12
1 files changed, 8 insertions, 4 deletions
diff --git a/include/net/snmp.h b/include/net/snmp.h
index da02ee0..692ee00 100644
--- a/include/net/snmp.h
+++ b/include/net/snmp.h
@@ -129,9 +129,9 @@ struct linux_xfrm_mib {
* nonlocked_atomic_inc() primitives -AK
*/
#define DEFINE_SNMP_STAT(type, name) \
- __typeof__(type) *name[2]
+ __typeof__(type) __percpu *name[2]
#define DECLARE_SNMP_STAT(type, name) \
- extern __typeof__(type) *name[2]
+ extern __typeof__(type) __percpu *name[2]
#define SNMP_STAT_BHPTR(name) (name[0])
#define SNMP_STAT_USRPTR(name) (name[1])
@@ -148,9 +148,13 @@ struct linux_xfrm_mib {
__this_cpu_add(mib[0]->mibs[field], addend)
#define SNMP_ADD_STATS_USER(mib, field, addend) \
this_cpu_add(mib[1]->mibs[field], addend)
+/*
+ * Use "__typeof__(*mib[0]) *ptr" instead of "__typeof__(mib[0]) ptr"
+ * to make @ptr a non-percpu pointer.
+ */
#define SNMP_UPD_PO_STATS(mib, basefield, addend) \
do { \
- __typeof__(mib[0]) ptr; \
+ __typeof__(*mib[0]) *ptr; \
preempt_disable(); \
ptr = this_cpu_ptr((mib)[!in_softirq()]); \
ptr->mibs[basefield##PKTS]++; \
@@ -159,7 +163,7 @@ struct linux_xfrm_mib {
} while (0)
#define SNMP_UPD_PO_STATS_BH(mib, basefield, addend) \
do { \
- __typeof__(mib[0]) ptr = \
+ __typeof__(*mib[0]) *ptr = \
__this_cpu_ptr((mib)[!in_softirq()]); \
ptr->mibs[basefield##PKTS]++; \
ptr->mibs[basefield##OCTETS] += addend;\
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