Re: [PATCH] net: export netdev_txq_to_tc to allow sch_mqprio to compile as module

On Tue, Oct 17, 2017 at 3:10 AM, Henrik Austad [off-list ref] wrote:

In commit 32302902ff09 ("mqprio: Reserve last 32 classid values for HW
traffic classes and misc IDs") sch_mqprio started using netdev_txq_to_tc
to find the correct tc instead of dev->tc_to_txq[]

However, when mqprio is compiled as a module, it cannot resolve the
symbol, leading to this error:

     ERROR: "netdev_txq_to_tc" [net/sched/sch_mqprio.ko] undefined!

This adds an EXPORT_SYMBOL() since the other user in the kernel
(netif_set_xps_queue) is also EXPORT_SYMBOL() (and not _GPL) or in a
sysfs-callback.

Cc: Alexander Duyck <redacted>
Cc: Jesus Sanchez-Palencia <redacted>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Henrik Austad <redacted>

Reviewed-by: Eric Dumazet <edumazet@google.com>