net: clean up snmp stats code
commit 8f0ea0fe3a036a47767f9c80e (snmp: reduce percpu needs by 50%)
reduced snmp array size to 1, so technically it doesn't have to be
an array any more. What's more, after the following commit:
commit 933393f58fef9963eac61db8093689544e29a600
Date: Thu Dec 22 11:58:51 2011 -0600
percpu: Remove irqsafe_cpu_xxx variants
We simply say that regular this_cpu use must be safe regardless of
preemption and interrupt state. That has no material change for x86
and s390 implementations of this_cpu operations. However, arches that
do not provide their own implementation for this_cpu operations will
now get code generated that disables interrupts instead of preemption.
probably no arch wants to have SNMP_ARRAY_SZ == 2. At least after
almost 3 years, no one complains.
So, just convert the array to a single pointer and remove snmp_mib_init()
and snmp_mib_free() as well.
Cc: Christoph Lameter <cl@linux.com>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/snmp.h b/include/net/snmp.h
index 7159626..f1f27fd 100644
--- a/include/net/snmp.h
+++ b/include/net/snmp.h
@@ -116,51 +116,49 @@
unsigned long mibs[LINUX_MIB_XFRMMAX];
};
-#define SNMP_ARRAY_SZ 1
-
#define DEFINE_SNMP_STAT(type, name) \
- __typeof__(type) __percpu *name[SNMP_ARRAY_SZ]
+ __typeof__(type) __percpu *name
#define DEFINE_SNMP_STAT_ATOMIC(type, name) \
__typeof__(type) *name
#define DECLARE_SNMP_STAT(type, name) \
- extern __typeof__(type) __percpu *name[SNMP_ARRAY_SZ]
+ extern __typeof__(type) __percpu *name
#define SNMP_INC_STATS_BH(mib, field) \
- __this_cpu_inc(mib[0]->mibs[field])
+ __this_cpu_inc(mib->mibs[field])
#define SNMP_INC_STATS_USER(mib, field) \
- this_cpu_inc(mib[0]->mibs[field])
+ this_cpu_inc(mib->mibs[field])
#define SNMP_INC_STATS_ATOMIC_LONG(mib, field) \
atomic_long_inc(&mib->mibs[field])
#define SNMP_INC_STATS(mib, field) \
- this_cpu_inc(mib[0]->mibs[field])
+ this_cpu_inc(mib->mibs[field])
#define SNMP_DEC_STATS(mib, field) \
- this_cpu_dec(mib[0]->mibs[field])
+ this_cpu_dec(mib->mibs[field])
#define SNMP_ADD_STATS_BH(mib, field, addend) \
- __this_cpu_add(mib[0]->mibs[field], addend)
+ __this_cpu_add(mib->mibs[field], addend)
#define SNMP_ADD_STATS_USER(mib, field, addend) \
- this_cpu_add(mib[0]->mibs[field], addend)
+ this_cpu_add(mib->mibs[field], addend)
#define SNMP_ADD_STATS(mib, field, addend) \
- this_cpu_add(mib[0]->mibs[field], addend)
+ this_cpu_add(mib->mibs[field], addend)
/*
- * Use "__typeof__(*mib[0]) *ptr" instead of "__typeof__(mib[0]) ptr"
+ * Use "__typeof__(*mib) *ptr" instead of "__typeof__(mib) ptr"
* to make @ptr a non-percpu pointer.
*/
#define SNMP_UPD_PO_STATS(mib, basefield, addend) \
do { \
- __typeof__(*mib[0]->mibs) *ptr = mib[0]->mibs; \
+ __typeof__(*mib->mibs) *ptr = mib->mibs; \
this_cpu_inc(ptr[basefield##PKTS]); \
this_cpu_add(ptr[basefield##OCTETS], addend); \
} while (0)
#define SNMP_UPD_PO_STATS_BH(mib, basefield, addend) \
do { \
- __typeof__(*mib[0]->mibs) *ptr = mib[0]->mibs; \
+ __typeof__(*mib->mibs) *ptr = mib->mibs; \
__this_cpu_inc(ptr[basefield##PKTS]); \
__this_cpu_add(ptr[basefield##OCTETS], addend); \
} while (0)
@@ -170,7 +168,7 @@
#define SNMP_ADD_STATS64_BH(mib, field, addend) \
do { \
- __typeof__(*mib[0]) *ptr = __this_cpu_ptr((mib)[0]); \
+ __typeof__(*mib) *ptr = __this_cpu_ptr(mib); \
u64_stats_update_begin(&ptr->syncp); \
ptr->mibs[field] += addend; \
u64_stats_update_end(&ptr->syncp); \
@@ -191,8 +189,8 @@
#define SNMP_INC_STATS64(mib, field) SNMP_ADD_STATS64(mib, field, 1)
#define SNMP_UPD_PO_STATS64_BH(mib, basefield, addend) \
do { \
- __typeof__(*mib[0]) *ptr; \
- ptr = __this_cpu_ptr((mib)[0]); \
+ __typeof__(*mib) *ptr; \
+ ptr = __this_cpu_ptr(mib); \
u64_stats_update_begin(&ptr->syncp); \
ptr->mibs[basefield##PKTS]++; \
ptr->mibs[basefield##OCTETS] += addend; \