Re: [PATCH 9/9] netfilter: implement xt_cgroup cgroup2 path match

On Saturday 2015-11-21 19:54, Florian Westphal wrote:

The only other question I have is wheter PATH_MAX might be a possible
ABI breaker in future.  It would have to be guaranteed that this is the
same size forever, else you'd get strange errors on rule insertion if
the sizes of the kernel and userspace version differs.

The same goes for IFNAMSIZ. But, so far, nobody changed it in the kernel,
even though there are voices that 15 characters + '\0' were a tight choice.