Revert "runtime: convert local var stop,ready at TestDebugCallUnsafePoint to atomic type"

This reverts https://go.dev/cl/427135.

Reason for revert: broke the test it modified on linux-amd64-noopt.

    --- FAIL: TestDebugCallUnsafePoint (0.00s)
        debug_test.go:265: want "call not at safe point", got %!s(<nil>)

Change-Id: I044c9720aed2d5e48b56bd7ab2781462270dcae9
Reviewed-on: https://go-review.googlesource.com/c/go/+/428395
Reviewed-by: xie cui <523516579@qq.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: hopehook <hopehook@golangcn.org>
Reviewed-by: Michael Pratt <mpratt@google.com>

1 files changed, 6 insertions, 6 deletions

diff --git a/src/runtime/debug_test.go b/src/runtime/debug_test.go
index b231be344c..75fe07ec2a 100644
--- a/src/runtime/debug_test.go
+++ b/src/runtime/debug_test.go
@@ -224,7 +224,7 @@ func TestDebugCallGrowStack(t *testing.T) {
 }
 
 //go:nosplit
-func debugCallUnsafePointWorker(gpp **runtime.G, ready, stop *atomic.Bool) {
+func debugCallUnsafePointWorker(gpp **runtime.G, ready, stop *uint32) {
 	// The nosplit causes this function to not contain safe-points
 	// except at calls.
 	runtime.LockOSThread()
@@ -232,8 +232,8 @@ func debugCallUnsafePointWorker(gpp **runtime.G, ready, stop *atomic.Bool) {
 
 	*gpp = runtime.Getg()
 
-	for !stop.Load() {
-		ready.Store(true)
+	for atomic.LoadUint32(stop) == 0 {
+		atomic.StoreUint32(ready, 1)
 	}
 }
 
@@ -253,10 +253,10 @@ func TestDebugCallUnsafePoint(t *testing.T) {
 
 	// Test that the runtime refuses call injection at unsafe points.
 	var g *runtime.G
-	var ready, stop atomic.Bool
-	defer stop.Store(true)
+	var ready, stop uint32
+	defer atomic.StoreUint32(&stop, 1)
 	go debugCallUnsafePointWorker(&g, &ready, &stop)
-	for !ready.Load() {
+	for atomic.LoadUint32(&ready) == 0 {
 		runtime.Gosched()
 	}