The Linux Foundation released a Community Enforcement Statement, and implemented a means to allow kernel developers to show their commitment to this statement.
Responding to concerns about rogue enforcement by kernel developers who have engaged in copyright profiteering (see my prior post for background), this effort is intended to set community expectation for enforcement of GPL violations relating to the Linux kernel.
An FAQ released by the Foundation explains that the commitment effectively implements opportunities to cure violations, similar to the opportunity available in GPL3, even though the license for the kernel remains under GPL2.