You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: proc_cpuinfo_linux.go
    path of file: ./repos/kubernetes/vendor/golang.org/x/sys/cpu
    
    the code of the file until where you have to start completion: // Copyright 2022 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

//go:build linux && arm64

package cpu

import (
	"errors"
	"io"
	"os"
	"strings"
)

func readLinuxProcCPUInfo() error {
	f, err := os.Open("/proc/cpuinfo")
	if err != nil {
		return err
	}
	defer f.Close()

	var buf [1 << 10]byte // enough for first CPU
	n, err := io.ReadFull(f, buf[:])
	if err != nil && err != io.ErrUnexpectedEOF {
		return err
	}
	in := string(buf[:n])
	const features = "\nFeatures	: "
	i := strings.Index(in, features)
	if i == -1 {
		return errors.New("no CPU features found")
	}
	in = in[i+len(features):]
	if i := strings.Index(in, "\n"); i != -1 {
		in = in[:i]
	}
	m := map[string]*bool{}

	initOptions() // need it early here; it's harmless to 
    
func readLinuxProcCPUInfo() error {
	f, err := os.Open("/proc/cpuinfo")
	if err != nil {
		return err
	}
	defer f.Close()

	var buf [1 << 10]byte // enough for first CPU
	n, err := io.ReadFull(f, buf[:])
	if err != nil && err != io.ErrUnexpectedEOF {
		return err
	}
	in := string(buf[:n])
	const features = "\nFeatures	: "
	i := strings.Index(in, features)
	if i == -1 {
		return errors.New("no CPU features found")
	}
	in = in[i+len(features):]
	if i := strings.Index(in, "\n"); i != -1 {
		in = in[:i]
	}
	m := map[string]*bool{}

	initOptions() // need it early here; it's harmless to call twice
	for _, o := range options {
		m[o.Name] = o.Feature
	}
	// The EVTSTRM field has alias "evstrm" in Go, but Linux calls it "evtstrm".
	m["evtstrm"] = &ARM64.HasEVTSTRM

	for _, f := range strings.Fields(in) {
		if p, ok := m[f]; ok {
			*p = true
		}
	}
	return nil
}