On Mon, 2018-01-01 at 15:24 +0100, Greg Kroah-Hartman wrote:
>
> --- a/arch/x86/kernel/cpu/bugs.c
> +++ b/arch/x86/kernel/cpu/bugs.c
> @@ -19,6 +19,14 @@
>
> void __init check_bugs(void)
> {
> +#ifdef CONFIG_X86_32
> + /*
> + * Regardless of whether PCID is enumerated, the SDM says
> + * that it can't be enabled in 32-bit mode.
> + */
> + setup_clear_cpu_cap(X86_FEATURE_PCID);
> +#endif
> +
> identify_boot_cpu();
> #ifndef CONFIG_SMP
> pr_info("CPU: ");
>
Razvan points out that the #ifdef there is redundant; in older kernels,
bugs.c is only built on 32-bit anyway.
We're working on backporting the other CPU_BUG_* and sysfs
vulnerabilities bits to 4.9 (first), and will probably end up
cherry-picking 62a67e123e ("x86/cpu: Merge bugs.c and bugs_64.c").
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