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| author | Eric Dumazet <edumazet@google.com> | 2012-08-04 20:26:13 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-08-06 13:40:47 -0700 |
| commit | d25398df59b561a26cb4000ceb4dea8a3ff94d22 (patch) | |
| tree | e5dfb19ca7a9d1dc7cfed76709ebc2c16c3200f1 /include/net/snmp.h | |
| parent | 9eb43e765368f835d92c93844ebce30da7efeb84 (diff) | |
| download | lwn-d25398df59b561a26cb4000ceb4dea8a3ff94d22.tar.gz lwn-d25398df59b561a26cb4000ceb4dea8a3ff94d22.zip | |
net: avoid reloads in SNMP_UPD_PO_STATS
Avoid two instructions to reload dev->nd_net->mib.ip_statistics pointer,
unsing a temp variable, in ip_rcv(), ip_output() paths for example.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/snmp.h')
| -rw-r--r-- | include/net/snmp.h | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/include/net/snmp.h b/include/net/snmp.h index 0147b901e79c..71596261fa99 100644 --- a/include/net/snmp.h +++ b/include/net/snmp.h @@ -154,13 +154,15 @@ struct linux_xfrm_mib { */ #define SNMP_UPD_PO_STATS(mib, basefield, addend) \ do { \ - this_cpu_inc(mib[0]->mibs[basefield##PKTS]); \ - this_cpu_add(mib[0]->mibs[basefield##OCTETS], addend); \ + __typeof__(*mib[0]->mibs) *ptr = mib[0]->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 { \ - __this_cpu_inc(mib[0]->mibs[basefield##PKTS]); \ - __this_cpu_add(mib[0]->mibs[basefield##OCTETS], addend); \ + __typeof__(*mib[0]->mibs) *ptr = mib[0]->mibs; \ + __this_cpu_inc(ptr[basefield##PKTS]); \ + __this_cpu_add(ptr[basefield##OCTETS], addend); \ } while (0) |