Re: [PATCH] x86/oprofile/ppro: Do not use __this_cpu* accessors in preemptible context
Thomas Gleixner <[email protected]>
| Newsgroups | gmane.linux.kernel,gmane.linux.oprofile |
|---|---|
| Message-ID | <alpine.DEB.2.20.1711081147310.1937@nanos> |
On Tue, 7 Nov 2017, Borislav Petkov wrote:
> --- a/arch/x86/oprofile/op_model_ppro.c
> +++ b/arch/x86/oprofile/op_model_ppro.c
> @@ -212,8 +212,9 @@ static void arch_perfmon_setup_counters(void)
> eax.full = cpuid_eax(0xa);
>
> /* Workaround for BIOS bugs in 6/15. Taken from perfmon2 */
> - if (eax.split.version_id == 0 && __this_cpu_read(cpu_info.x86) == 6 &&
> - __this_cpu_read(cpu_info.x86_model) == 15) {
> + if (eax.split.version_id == 0 &&
> + boot_cpu_data.x86 == 6 &&
> + boot_cpu_data.x86_model == 15) {
> eax.split.version_id = 2;
> eax.split.num_counters = 2;
> eax.split.bit_width = 40;
AFAICT, ppro_setup_ctrs() has the same issue