From: Eric Dumazet Date: Fri, 18 Oct 2024 05:23:10 +0000 (+0000) Subject: net: netdev_tx_sent_queue() small optimization X-Git-Tag: v6.13-rc1~135^2~236 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7cfc1b1fa8673fe386304194d4cc2c8fe555bbf9;p=thirdparty%2Fkernel%2Fstable.git net: netdev_tx_sent_queue() small optimization Change smp_mb() imediately following a set_bit() with smp_mb__after_atomic(). Signed-off-by: Eric Dumazet Link: https://patch.msgid.link/20241018052310.2612084-1-edumazet@google.com Signed-off-by: Paolo Abeni --- diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index 86a0b7eb94614..bbd30f3c5d290 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -3517,7 +3517,7 @@ static inline void netdev_tx_sent_queue(struct netdev_queue *dev_queue, * because in netdev_tx_completed_queue we update the dql_completed * before checking the XOFF flag. */ - smp_mb(); + smp_mb__after_atomic(); /* check again in case another CPU has just made room avail */ if (unlikely(dql_avail(&dev_queue->dql) >= 0))