On Mon, 2016-08-08 at 18:22 +0800, Jia He wrote:
> In PowerPC server with large number cpus, the loop index in smt=1 could be
> reduced to 1/8 compared with smt=8.
> Thus cache misses can be reduced.
>
> Signed-off-by: Jia He <hejia...@gmail.com>
> Cc: "David S. Miller" <da...@davemloft.net>
> Cc: Alexey Kuznetsov <kuz...@ms2.inr.ac.ru>
> Cc: James Morris <jmor...@namei.org>
> Cc: Hideaki YOSHIFUJI <yoshf...@linux-ipv6.org>
> Cc: Patrick McHardy <ka...@trash.net>
> ---
> net/ipv6/addrconf.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
> index 43fa8d0..1fce613 100644
> --- a/net/ipv6/addrconf.c
> +++ b/net/ipv6/addrconf.c
> @@ -4969,7 +4969,7 @@ static inline void __snmp6_fill_stats64(u64 *stats,
> void __percpu *mib,
>
> buff[0] = IPSTATS_MIB_MAX;
>
> - for_each_possible_cpu(c) {
> + for_each_online_cpu(c) {
> for (i = 1; i < IPSTATS_MIB_MAX; i++)
> buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
> }
This will break on machines with cpu hotplug.
