internal: replace internal memoize with sync.OnceValues

Signed-off-by: kwakubiney <[email protected]>

Author: kwakubiney

btf/btf_test.go

@@ -7,6 +7,7 @@ import (
 	"fmt"
 	"io"
 	"os"
+	"sync"
 	"testing"
 
 	"github.com/go-quicktest/qt"
@@ -37,7 +38,7 @@ type specAndRawBTF struct {
 	spec *Spec
 }
 
-var vmlinuxTestdata = internal.Memoize(func() (specAndRawBTF, error) {
+var vmlinuxTestdata = sync.OnceValues(func() (specAndRawBTF, error) {
 	b, err := internal.ReadAllCompressed("testdata/vmlinux.btf.gz")
 	if err != nil {
 		return specAndRawBTF{}, err

cpu.go

@@ -4,11 +4,10 @@ import (
 	"fmt"
 	"os"
 	"strings"
-
-	"github.com/cilium/ebpf/internal"
+	"sync"
 )
 
-var possibleCPU = internal.Memoize(func() (int, error) {
+var possibleCPU = sync.OnceValues(func() (int, error) {
 	return parseCPUsFromFile("/sys/devices/system/cpu/possible")
 })
 

internal/memoize.go

@@ -4,13 +4,13 @@ import (
 	"errors"
 	"os"
 	"strings"
+	"sync"
 	"testing"
 
-	"github.com/cilium/ebpf/internal"
 	"github.com/cilium/ebpf/internal/unix"
 )
 
-var cgroup2Path = internal.Memoize(func() (string, error) {
+var cgroup2Path = sync.OnceValues(func() (string, error) {
 	mounts, err := os.ReadFile("/proc/mounts")
 	if err != nil {
 		return "", err

internal/testutils/cgroup.go

@@ -8,6 +8,7 @@ import (
 	"path/filepath"
 	"runtime"
 	"strings"
+	"sync"
 	"syscall"
 
 	"github.com/cilium/ebpf/internal"
@@ -110,7 +111,7 @@ func sanitizeTracefsPath(path ...string) (string, error) {
 // Since kernel 4.1 tracefs should be mounted by default at /sys/kernel/tracing,
 // but may be also be available at /sys/kernel/debug/tracing if debugfs is mounted.
 // The available tracefs paths will depends on distribution choices.
-var getTracefsPath = internal.Memoize(func() (string, error) {
+var getTracefsPath = sync.OnceValues(func() (string, error) {
 	for _, p := range []struct {
 		path   string
 		fsType int64

internal/tracefs/kprobe.go

@@ -2,6 +2,7 @@ package internal
 
 import (
 	"fmt"
+	"sync"
 
 	"github.com/cilium/ebpf/internal/unix"
 )
@@ -79,7 +80,7 @@ func (v Version) Kernel() uint32 {
 }
 
 // KernelVersion returns the version of the currently running kernel.
-var KernelVersion = Memoize(func() (Version, error) {
+var KernelVersion = sync.OnceValues(func() (Version, error) {
 	return detectKernelVersion()
 })
 

internal/version.go

@@ -10,6 +10,7 @@ import (
 	"path/filepath"
 	"reflect"
 	"strings"
+	"sync"
 	"time"
 	"unsafe"
 
@@ -907,7 +908,7 @@ func (m *Map) nextKey(key interface{}, nextKeyOut sys.Pointer) error {
 	return nil
 }
 
-var mmapProtectedPage = internal.Memoize(func() ([]byte, error) {
+var mmapProtectedPage = sync.OnceValues(func() ([]byte, error) {
 	return unix.Mmap(-1, 0, os.Getpagesize(), unix.PROT_NONE, unix.MAP_ANON|unix.MAP_SHARED)
 })