net: snmp: fix 64bit stats on 32bit arches
I accidentally replaced BH disabling by preemption disabling
in SNMP_ADD_STATS64() and SNMP_UPD_PO_STATS64() on 32bit builds.
For 64bit stats on 32bit arch, we really need to disable BH,
since the "struct u64_stats_sync syncp" might be manipulated
both from process and BH contexts.
Fixes: 6aef70a851ac ("net: snmp: kill various STATS_USER() helpers")
Reported-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Tested-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/snmp.h b/include/net/snmp.h
index 6bdd255..c9228ad 100644
--- a/include/net/snmp.h
+++ b/include/net/snmp.h
@@ -166,9 +166,9 @@
#define SNMP_ADD_STATS64(mib, field, addend) \
do { \
- preempt_disable(); \
+ local_bh_disable(); \
__SNMP_ADD_STATS64(mib, field, addend); \
- preempt_enable(); \
+ local_bh_enable(); \
} while (0)
#define __SNMP_INC_STATS64(mib, field) SNMP_ADD_STATS64(mib, field, 1)
@@ -184,9 +184,9 @@
} while (0)
#define SNMP_UPD_PO_STATS64(mib, basefield, addend) \
do { \
- preempt_disable(); \
+ local_bh_disable(); \
__SNMP_UPD_PO_STATS64(mib, basefield, addend); \
- preempt_enable(); \
+ local_bh_enable(); \
} while (0)
#else
#define __SNMP_INC_STATS64(mib, field) __SNMP_INC_STATS(mib, field)