[SNMP]: Fix SNMP counters with PREEMPT

The SNMP macros use raw_smp_processor_id() in process context
which is illegal because the process may be preempted and then
migrated to another CPU.

This patch makes it use get_cpu/put_cpu to disable preemption.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 17 insertions, 4 deletions

diff --git a/include/net/snmp.h b/include/net/snmp.h
index 9c5793db637..fbb66663a42 100644
--- a/include/net/snmp.h
+++ b/include/net/snmp.h
@@ -23,6 +23,7 @@
 
 #include <linux/cache.h>
 #include <linux/snmp.h>
+#include <linux/smp.h>
 
 /*
  * Mibs are stored in array of unsigned long.
@@ -135,14 +136,26 @@ struct linux_mib {
 #define SNMP_INC_STATS_BH(mib, field)   \
         (per_cpu_ptr(mib[0], raw_smp_processor_id())->mibs[field]++)
 #define SNMP_INC_STATS_USER(mib, field) \
-        (per_cpu_ptr(mib[1], raw_smp_processor_id())->mibs[field]++)
+        do { \
+                per_cpu_ptr(mib[1], get_cpu())->mibs[field]++; \
+                put_cpu(); \
+        } while (0)
 #define SNMP_INC_STATS(mib, field)      \
-        (per_cpu_ptr(mib[!in_softirq()], raw_smp_processor_id())->mibs[field]++)
+        do { \
+                per_cpu_ptr(mib[!in_softirq()], get_cpu())->mibs[field]++; \
+                put_cpu(); \
+        } while (0)
 #define SNMP_DEC_STATS(mib, field)      \
-        (per_cpu_ptr(mib[!in_softirq()], raw_smp_processor_id())->mibs[field]--)
+        do { \
+                per_cpu_ptr(mib[!in_softirq()], get_cpu())->mibs[field]--; \
+                put_cpu(); \
+        } while (0)
 #define SNMP_ADD_STATS_BH(mib, field, addend)   \
         (per_cpu_ptr(mib[0], raw_smp_processor_id())->mibs[field] += addend)
 #define SNMP_ADD_STATS_USER(mib, field, addend)         \
-        (per_cpu_ptr(mib[1], raw_smp_processor_id())->mibs[field] += addend)
+        do { \
+                per_cpu_ptr(mib[1], get_cpu())->mibs[field] += addend; \
+                put_cpu(); \
+        } while (0)
 
 #endif