CVE-2026-64248 MIPS: smp: report dying CPU to RCU in stop_this_cpu()

In the Linux kernel, the following vulnerability has been resolved: MIPS: smp: report dying CPU to RCU in stopthiscpu smpsendstop parks all secondary CPUs in stopthiscpu. The function marks the CPU offline for the scheduler via setcpuonlinefalse but never informs RCU, so RCU keeps expecting a...