GODRIVER-2236 Fix atomic op alignment and run linters on multiple arc…

…hitectures. (#810)

Makefile

@@ -13,6 +13,7 @@ EXAMPLES_TEST_PKGS = $(shell etc/list_test_pkgs.sh ./examples)
 PKGS = $(BSON_PKGS) $(EVENT_PKGS) $(MONGO_PKGS) $(UNSTABLE_PKGS) $(TAG_PKG) $(EXAMPLES_PKGS)
 TEST_PKGS = $(BSON_TEST_PKGS) $(EVENT_TEST_PKGS) $(MONGO_TEST_PKGS) $(UNSTABLE_TEST_PKGS) $(TAG_PKG) $(EXAMPLES_TEST_PKGS)
 ATLAS_URIS = "$(ATLAS_FREE)" "$(ATLAS_REPLSET)" "$(ATLAS_SHARD)" "$(ATLAS_TLS11)" "$(ATLAS_TLS12)" "$(ATLAS_FREE_SRV)" "$(ATLAS_REPLSET_SRV)" "$(ATLAS_SHARD_SRV)" "$(ATLAS_TLS11_SRV)" "$(ATLAS_TLS12_SRV)" "$(ATLAS_SERVERLESS)" "$(ATLAS_SERVERLESS_SRV)"
+GODISTS=linux/amd64 linux/386 linux/arm64 linux/arm linux/s390x
 
 TEST_TIMEOUT = 1800
 
@@ -59,7 +60,13 @@ fmt:
 
 .PHONY: lint
 lint:
-	golangci-lint run --config .golangci.yml ./...
+	for dist in $(GODISTS); do \
+		goos=$$(echo $$dist | cut -d/ -f 1) ; \
+		goarch=$$(echo $$dist | cut -d/ -f 2) ; \
+		command="GOOS=$$goos GOARCH=$$goarch golangci-lint run --config .golangci.yml ./..." ; \
+		echo $$command ; \
+		eval $$command ; \
+	done
 
 .PHONY: test
 test:

mongo/integration/mtest/mongotest.go

@@ -84,6 +84,12 @@ type WriteConcernErrorData struct {
 
 // T is a wrapper around testing.T.
 type T struct {
+	// connsCheckedOut is the net number of connections checked out during test execution.
+	// It must be accessed using the atomic package and should be at the beginning of the struct.
+	// - atomic bug: https://pkg.go.dev/sync/atomic#pkg-note-BUG
+	// - suggested layout: https://go101.org/article/memory-layout.html
+	connsCheckedOut int64
+
 	*testing.T
 
 	// members for only this T instance
@@ -104,7 +110,6 @@ type T struct {
 	dataLake          *bool
 	ssl               *bool
 	collCreateOpts    bson.D
-	connsCheckedOut   int64 // net number of connections checked out during test execution
 	requireAPIVersion *bool
 
 	// options copied to sub-tests

x/mongo/driver/topology/server.go

@@ -82,10 +82,15 @@ func connectionStateString(state int64) string {
 
 // Server is a single server within a topology.
 type Server struct {
-	cfg             *serverConfig
-	address         address.Address
+	// connectionstate must be accessed using the atomic package and should be at the beginning of
+	// the struct.
+	// - atomic bug: https://pkg.go.dev/sync/atomic#pkg-note-BUG
+	// - suggested layout: https://go101.org/article/memory-layout.html
 	connectionstate int64
 
+	cfg     *serverConfig
+	address address.Address
+
 	// connection related fields
 	pool *pool