Bump up Go 1.13 as minimum requirement

PiperOrigin-RevId: 284320186

4 files changed, 4 insertions, 40 deletions

diff --git a/pkg/syncutil/BUILD b/pkg/syncutil/BUILD
index b06a90bef..cb1f41628 100644
--- a/pkg/syncutil/BUILD
+++ b/pkg/syncutil/BUILD
@@ -31,8 +31,6 @@ go_template(
 go_library(
     name = "syncutil",
     srcs = [
-        "downgradable_rwmutex_1_12_unsafe.go",
-        "downgradable_rwmutex_1_13_unsafe.go",
         "downgradable_rwmutex_unsafe.go",
         "memmove_unsafe.go",
         "norace_unsafe.go",
diff --git a/pkg/syncutil/downgradable_rwmutex_1_12_unsafe.go b/pkg/syncutil/downgradable_rwmutex_1_12_unsafe.go
deleted file mode 100644
index 7c6336e62..000000000
--- a/pkg/syncutil/downgradable_rwmutex_1_12_unsafe.go
+++ /dev/null
@@ -1,21 +0,0 @@
-// Copyright 2009 The Go Authors. All rights reserved.
-// Copyright 2019 The gVisor Authors.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// +build go1.12
-// +build !go1.13
-
-// TODO(b/133868570): Delete once Go 1.12 is no longer supported.
-
-package syncutil
-
-import _ "unsafe"
-
-//go:linkname runtimeSemrelease112 sync.runtime_Semrelease
-func runtimeSemrelease112(s *uint32, handoff bool)
-
-func runtimeSemrelease(s *uint32, handoff bool, skipframes int) {
-	// 'skipframes' is only available starting from 1.13.
-	runtimeSemrelease112(s, handoff)
-}
diff --git a/pkg/syncutil/downgradable_rwmutex_1_13_unsafe.go b/pkg/syncutil/downgradable_rwmutex_1_13_unsafe.go
deleted file mode 100644
index 3c3673119..000000000
--- a/pkg/syncutil/downgradable_rwmutex_1_13_unsafe.go
+++ /dev/null
@@ -1,16 +0,0 @@
-// Copyright 2009 The Go Authors. All rights reserved.
-// Copyright 2019 The gVisor Authors.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// +build go1.13
-// +build !go1.15
-
-// Check go:linkname function signatures when updating Go version.
-
-package syncutil
-
-import _ "unsafe"
-
-//go:linkname runtimeSemrelease sync.runtime_Semrelease
-func runtimeSemrelease(s *uint32, handoff bool, skipframes int)
diff --git a/pkg/syncutil/downgradable_rwmutex_unsafe.go b/pkg/syncutil/downgradable_rwmutex_unsafe.go
index 07feca402..51e11555d 100644
--- a/pkg/syncutil/downgradable_rwmutex_unsafe.go
+++ b/pkg/syncutil/downgradable_rwmutex_unsafe.go
@@ -3,7 +3,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build go1.12
+// +build go1.13
 // +build !go1.15
 
 // Check go:linkname function signatures when updating Go version.
@@ -27,6 +27,9 @@ import (
 //go:linkname runtimeSemacquire sync.runtime_Semacquire
 func runtimeSemacquire(s *uint32)
 
+//go:linkname runtimeSemrelease sync.runtime_Semrelease
+func runtimeSemrelease(s *uint32, handoff bool, skipframes int)
+
 // DowngradableRWMutex is identical to sync.RWMutex, but adds the DowngradeLock
 // method.
 type DowngradableRWMutex struct {