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SubjectRe: [PATCH 1/3] perf/x86: add sysfs entry to freeze counter on SMI
On Thu, Mar 23, 2017 at 11:25:49AM -0700, kan.liang@intel.com wrote:
> + for_each_possible_cpu(cpu) {
> + rdmsrl_on_cpu(cpu, MSR_IA32_DEBUGCTLMSR, &debugctlmsr);
> + if (val)
> + wrmsrl_on_cpu(cpu, MSR_IA32_DEBUGCTLMSR, debugctlmsr | DEBUGCTLMSR_FREEZE_WHILE_SMM);
> + else
> + wrmsrl_on_cpu(cpu, MSR_IA32_DEBUGCTLMSR, debugctlmsr & ~DEBUGCTLMSR_FREEZE_WHILE_SMM);
> + }

No; that's just disgusting. Also {rd,wr}msr_on_cpu() should die, exactly
because people end up writing crap like this.

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