diff --git a/src/corelib/compat/removed_api.cpp b/src/corelib/compat/removed_api.cpp
index b7c5ae8453..d810da59e8 100644
--- a/src/corelib/compat/removed_api.cpp
+++ b/src/corelib/compat/removed_api.cpp
@@ -601,6 +601,10 @@ QStringView QXmlStreamAttributes::value(QLatin1StringView qualifiedName) const
     return value(QAnyStringView(qualifiedName));
 }
 
+// inlined API
+#if QT_CONFIG(thread)
+#include "qreadwritelock.h"
+#endif
 
 // #include "qotherheader.h"
 // // implement removed functions from qotherheader.h
diff --git a/src/corelib/thread/qreadwritelock.cpp b/src/corelib/thread/qreadwritelock.cpp
index 7e29aa3905..36f051408e 100644
--- a/src/corelib/thread/qreadwritelock.cpp
+++ b/src/corelib/thread/qreadwritelock.cpp
@@ -132,6 +132,7 @@ QReadWriteLock::~QReadWriteLock()
 }
 
 /*!
+    \fn QReadWriteLock::lockForRead()
     Locks the lock for reading. This function will block the current
     thread if another thread has locked for writing.
 
@@ -140,10 +141,6 @@ QReadWriteLock::~QReadWriteLock()
 
     \sa unlock(), lockForWrite(), tryLockForRead()
 */
-void QReadWriteLock::lockForRead()
-{
-    tryLockForRead(-1);
-}
 
 /*!
 
@@ -229,6 +226,7 @@ Q_NEVER_INLINE static bool contendedTryLockForRead(QAtomicPointer<QReadWriteLock
 }
 
 /*!
+    \fn QReadWriteLock::lockForWrite()
     Locks the lock for writing. This function will block the current
     thread if another thread (including the current) has locked for
     reading or writing (unless the lock has been created using the
@@ -239,10 +237,6 @@ Q_NEVER_INLINE static bool contendedTryLockForRead(QAtomicPointer<QReadWriteLock
 
     \sa unlock(), lockForRead(), tryLockForWrite()
 */
-void QReadWriteLock::lockForWrite()
-{
-    tryLockForWrite(-1);
-}
 
 /*!
     Attempts to lock for writing. This function returns \c true if the
diff --git a/src/corelib/thread/qreadwritelock.h b/src/corelib/thread/qreadwritelock.h
index 1a94386386..4db44784e3 100644
--- a/src/corelib/thread/qreadwritelock.h
+++ b/src/corelib/thread/qreadwritelock.h
@@ -21,12 +21,14 @@ public:
     explicit QReadWriteLock(RecursionMode recursionMode = NonRecursive);
     ~QReadWriteLock();
 
+    QT_CORE_INLINE_SINCE(6, 6)
     void lockForRead();
 #if QT_CORE_REMOVED_SINCE(6, 6)
     bool tryLockForRead();
 #endif
     bool tryLockForRead(int timeout = 0);
 
+    QT_CORE_INLINE_SINCE(6, 6)
     void lockForWrite();
 #if QT_CORE_REMOVED_SINCE(6, 6)
     bool tryLockForWrite();
@@ -41,6 +43,18 @@ private:
     friend class QReadWriteLockPrivate;
 };
 
+#if QT_CORE_INLINE_IMPL_SINCE(6, 6)
+void QReadWriteLock::lockForRead()
+{
+    tryLockForRead(-1);
+}
+
+void QReadWriteLock::lockForWrite()
+{
+    tryLockForWrite(-1);
+}
+#endif // inline since 6.6
+
 #if defined(Q_CC_MSVC)
 #pragma warning( push )
 #pragma warning( disable : 4312 ) // ignoring the warning from /Wp64