Pull x86 fixes from Dave Hansen:
 "The most important fix here adds a missing CPU model to the recent
  Gather Data Sampling (GDS) mitigation list to ensure that mitigations
  are available on that CPU.

  There are also a pair of warning fixes, and closure of a covert
  channel that pops up when protection keys are disabled.

  Summary:
   - Mark all Skylake CPUs as vulnerable to GDS
   - Fix PKRU covert channel
   - Fix -Wmissing-variable-declarations warning for ia32_xyz_class
   - Fix kernel-doc annotation warning"

* tag 'x86-urgent-2023-09-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/fpu/xstate: Fix PKRU covert channel
  x86/irq/i8259: Fix kernel-doc annotation warning
  x86/speculation: Mark all Skylake CPUs as vulnerable to GDS
  x86/audit: Fix -Wmissing-variable-declarations warning for ia32_xyz_class