Assuming that missing online file indicates CONFIG_HOTPLUG_CPU=n

Signed-off-by: Maciej "Iwan" Iwanowski <[email protected]>

Author: iwankgb

utils/sysfs/sysfs.go

@@ -22,7 +22,6 @@ import (
 	"os"
 	"path"
 	"path/filepath"
-	"regexp"
 	"strconv"
 	"strings"
 
@@ -341,7 +340,7 @@ func (fs *realSysFs) IsCPUOnline(dir string) bool {
 	if err != nil {
 		pathErr, ok := err.(*os.PathError)
 		if ok {
-			if errors.Is(pathErr.Unwrap(), os.ErrNotExist) && isZeroCPU(dir) {
+			if errors.Is(pathErr.Unwrap(), os.ErrNotExist) {
 				return true
 			}
 		}
@@ -351,9 +350,3 @@ func (fs *realSysFs) IsCPUOnline(dir string) bool {
 	trimmed := bytes.TrimSpace(content)
 	return len(trimmed) == 1 && trimmed[0] == 49
 }
-
-func isZeroCPU(dir string) bool {
-	regex := regexp.MustCompile("cpu([0-9]*)")
-	matches := regex.FindStringSubmatch(dir)
-	return len(matches) == 2 && matches[1] == "0"
-}

utils/sysfs/sysfs_test.go

@@ -139,5 +139,5 @@ func TestIsCPUOnlineNoFileAndCPU0MustBeOnline(t *testing.T) {
 	assert.True(t, online)
 
 	online = sysFs.IsCPUOnline("./testdata/missing_online/node0/cpu33")
-	assert.False(t, online)
+	assert.True(t, online)
 }