The removal was intentional. In fact it was supposed to be removed from the exported headers in 4.2 but a mistake was made, and this was just now fixed in 4.12. The justification is in the original commit message.
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b72e7464e4cf80117938e6adb8c22fdc1ca46d42 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1710799 Title: missing asm/msr-index.h in linux-libc-dev 4.12 causes collectd build failure To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/collectd/+bug/1710799/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
