diff options
| author | Prashant Bhole <bhole_prashant_q7@lab.ntt.co.jp> | 2018-12-11 03:43:07 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-12-14 22:36:26 +0100 |
| commit | 6342ca644713601b42dcb8f35e3751afc0943373 (patch) | |
| tree | c03c2eeddcd78b298fa4795b3545b571400efce1 /drivers/net/tun.c | |
| parent | hamradio, ppp: change semaphore to completion (diff) | |
| download | linux-6342ca644713601b42dcb8f35e3751afc0943373.tar.xz linux-6342ca644713601b42dcb8f35e3751afc0943373.zip | |
tun: replace get_cpu_ptr with this_cpu_ptr when bh disabled
tun_xdp_one() runs with local bh disabled. So there is no need to
disable preemption by calling get_cpu_ptr while updating stats. This
patch replaces the use of get_cpu_ptr() with this_cpu_ptr() as a
micro-optimization. Also removes related put_cpu_ptr call.
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Prashant Bhole <bhole_prashant_q7@lab.ntt.co.jp>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/tun.c')
| -rw-r--r-- | drivers/net/tun.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/net/tun.c b/drivers/net/tun.c index 72577aa35b06..a4fdad475594 100644 --- a/drivers/net/tun.c +++ b/drivers/net/tun.c @@ -2495,12 +2495,14 @@ build: skb_record_rx_queue(skb, tfile->queue_index); netif_receive_skb(skb); - stats = get_cpu_ptr(tun->pcpu_stats); + /* No need for get_cpu_ptr() here since this function is + * always called with bh disabled + */ + stats = this_cpu_ptr(tun->pcpu_stats); u64_stats_update_begin(&stats->syncp); stats->rx_packets++; stats->rx_bytes += datasize; u64_stats_update_end(&stats->syncp); - put_cpu_ptr(stats); if (rxhash) tun_flow_update(tun, rxhash, tfile); |