1 files changed, 36 insertions, 0 deletions

diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index 640db9b90330..3ceb025b16f2 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -1427,6 +1427,42 @@ unsigned long snmp_fold_field(void __percpu *mib[], int offt)
 }
 EXPORT_SYMBOL_GPL(snmp_fold_field);
 
+#if BITS_PER_LONG==32
+
+u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t syncp_offset)
+{
+        u64 res = 0;
+        int cpu;
+
+        for_each_possible_cpu(cpu) {
+                void *bhptr, *userptr;
+                struct u64_stats_sync *syncp;
+                u64 v_bh, v_user;
+                unsigned int start;
+
+                /* first mib used by softirq context, we must use _bh() accessors */
+                bhptr = per_cpu_ptr(SNMP_STAT_BHPTR(mib), cpu);
+                syncp = (struct u64_stats_sync *)(bhptr + syncp_offset);
+                do {
+                        start = u64_stats_fetch_begin_bh(syncp);
+                        v_bh = *(((u64 *) bhptr) + offt);
+                } while (u64_stats_fetch_retry_bh(syncp, start));
+
+                /* second mib used in USER context */
+                userptr = per_cpu_ptr(SNMP_STAT_USRPTR(mib), cpu);
+                syncp = (struct u64_stats_sync *)(userptr + syncp_offset);
+                do {
+                        start = u64_stats_fetch_begin(syncp);
+                        v_user = *(((u64 *) userptr) + offt);
+                } while (u64_stats_fetch_retry(syncp, start));
+
+                res += v_bh + v_user;
+        }
+        return res;
+}
+EXPORT_SYMBOL_GPL(snmp_fold_field64);
+#endif
+
 int snmp_mib_init(void __percpu *ptr[2], size_t mibsize, size_t align)
 {
         BUG_ON(ptr == NULL);