Linus has released the 4.1 kernel. "It's not like the 4.1 release cycle was particularly painful, and let's hope that the extra week of letting it sit makes for a great release. Which wouldn't be a bad thing, considering that 4.1 will also be a LTS release." Headline features in this release include support for encrypted ext4 filesystems, the persistent memory block driver, ACPI support for the ARM64 architecture, and more.