CVE-2026-80611

In the Linux kernel, the following vulnerability has been resolved:

ACPI: processor_idle: Mark LPI enter functions as __cpuidle

When function tracing or Kprobes is enabled, entering an ACPI Low Power Idle (LPI) state triggers the following RCU splat:

RCU not on for: acpiidlelpienter+0x4/0xd8 WARNING: CPU: 8 PID: 0 at include/linux/tracerecursion.h:162 functiontracecall+0x1e8/0x228

The acpiidlelpienter() function is invoked within the cpuidle path after RCU has already been disabled for the current local CPU. Consequently, ftrace's functiontrace_call() expects RCU to be actively watching before recording trace data, emitting a warning if it is not.

Fix this by annotating acpiidlelpi_enter(), the generic __weak stub, and the RISC-V implementation of acpiprocessorffhlpienter() with __cpuidle. This moves these functions into the '.cpuidle.text' section, implicitly disabling ftrace instrumentation (notrace) along this sensitive path and preventing trace-induced RCU warnings during idle entry.