Linux kernel 5.1.21 released

Linux kernel version 5.1.21 is now available:

Full source:    https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.1.21.tar.xz
Patch:          https://cdn.kernel.org/pub/linux/kernel/v5.x/patch-5.1.21.xz
PGP Signature:  https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.1.21.tar.sign

You can view the summary of the changes at the following URL:
https://git.kernel.org/stable/ds/v5.1.21/v5.1.20