CVE-2023-53671 srcu: Delegate work to the boot cpu if using SRCU_SIZE_SMALL

In the Linux kernel, the following vulnerability has been resolved: srcu: Delegate work to the boot cpu if using SRCUSIZESMALL Commit 994f706872e6 "srcu: Make Tree SRCU able to operate without snpnode array" assumes that cpu 0 is always online. However, there really are situations when some other...