diff --git a/dexpreopt/config.go b/dexpreopt/config.go
index 0c79ccc..2a929c5 100644
--- a/dexpreopt/config.go
+++ b/dexpreopt/config.go
@@ -16,7 +16,6 @@
 
 import (
 	"encoding/json"
-	"io/ioutil"
 	"strings"
 
 	"android/soong/android"
@@ -185,7 +184,7 @@
 // soongConfig argument. LoadGlobalConfig is used directly in Soong and in
 // dexpreopt_gen called from Make to read the $OUT/dexpreopt.config written by
 // Make.
-func LoadGlobalConfig(ctx android.PathContext, path string, soongConfig GlobalSoongConfig) (GlobalConfig, []byte, error) {
+func LoadGlobalConfig(ctx android.PathContext, data []byte, soongConfig GlobalSoongConfig) (GlobalConfig, error) {
 	type GlobalJSONConfig struct {
 		GlobalConfig
 
@@ -196,9 +195,9 @@
 	}
 
 	config := GlobalJSONConfig{}
-	data, err := loadConfig(ctx, path, &config)
+	err := json.Unmarshal(data, &config)
 	if err != nil {
-		return config.GlobalConfig, nil, err
+		return config.GlobalConfig, err
 	}
 
 	// Construct paths that require a PathContext.
@@ -209,13 +208,13 @@
 	// either CreateGlobalSoongConfig or LoadGlobalSoongConfig).
 	config.GlobalConfig.SoongConfig = soongConfig
 
-	return config.GlobalConfig, data, nil
+	return config.GlobalConfig, nil
 }
 
 // LoadModuleConfig reads a per-module dexpreopt.config file into a ModuleConfig struct.  It is not used in Soong, which
 // receives a ModuleConfig struct directly from java/dexpreopt.go.  It is used in dexpreopt_gen called from oMake to
 // read the module dexpreopt.config written by Make.
-func LoadModuleConfig(ctx android.PathContext, path string) (ModuleConfig, error) {
+func LoadModuleConfig(ctx android.PathContext, data []byte) (ModuleConfig, error) {
 	type ModuleJSONConfig struct {
 		ModuleConfig
 
@@ -233,7 +232,7 @@
 
 	config := ModuleJSONConfig{}
 
-	_, err := loadConfig(ctx, path, &config)
+	err := json.Unmarshal(data, &config)
 	if err != nil {
 		return config.ModuleConfig, err
 	}
@@ -289,10 +288,10 @@
 
 // LoadGlobalSoongConfig reads the dexpreopt_soong.config file into a
 // GlobalSoongConfig struct. It is only used in dexpreopt_gen.
-func LoadGlobalSoongConfig(ctx android.PathContext, path string) (GlobalSoongConfig, error) {
+func LoadGlobalSoongConfig(ctx android.PathContext, data []byte) (GlobalSoongConfig, error) {
 	var jc globalJsonSoongConfig
 
-	_, err := loadConfig(ctx, path, &jc)
+	err := json.Unmarshal(data, &jc)
 	if err != nil {
 		return GlobalSoongConfig{}, err
 	}
@@ -352,26 +351,6 @@
 	}, " "))
 }
 
-func loadConfig(ctx android.PathContext, path string, config interface{}) ([]byte, error) {
-	r, err := ctx.Fs().Open(path)
-	if err != nil {
-		return nil, err
-	}
-	defer r.Close()
-
-	data, err := ioutil.ReadAll(r)
-	if err != nil {
-		return nil, err
-	}
-
-	err = json.Unmarshal(data, config)
-	if err != nil {
-		return nil, err
-	}
-
-	return data, nil
-}
-
 func GlobalConfigForTests(ctx android.PathContext) GlobalConfig {
 	return GlobalConfig{
 		DisablePreopt:                      false,