Comment 2 for bug 1570631

Is there anyone who knows how to retrieve MAX_TAP_QUEUES from the running system? I looked at drivers/net/tun.c but couldn't find how to do it.
MAX_TAP_QUEUES is 8 in kernel 3.x[1] and it is 256 in kernel 4.x[2]. I want to find MAX_TAP_QUEUES programmatically without hardcoding its value for each kernel version.

[1]https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/tree/drivers/net/tun.c?id=refs/tags/v3.18.35#n118
[2]https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/tree/drivers/net/tun.c?id=refs/tags/v4.1.26#n128