diff --git a/src/corelib/kernel/qpermissions.cpp b/src/corelib/kernel/qpermissions.cpp
index 0b6b2604e1a..12224636ff3 100644
--- a/src/corelib/kernel/qpermissions.cpp
+++ b/src/corelib/kernel/qpermissions.cpp
@@ -281,14 +281,17 @@ const void *QPermission::data(QMetaType requestedType) const
     return m_data.data();
 }
 
-
-
-#define QT_DEFINE_PERMISSION_SPECIAL_FUNCTIONS(ClassName) \
-    ClassName::ClassName() : d(new ClassName##Private) {} \
+#define QT_PERMISSION_IMPL_COMMON(ClassName) \
+    /* Class##Private is unused until we need it: */ \
+    static_assert(sizeof(ClassName) == sizeof(void*), \
+                  "You have added too many members to " #ClassName "::ShortData. " \
+                  "Decrease their size or switch to using a d-pointer."); \
     ClassName::ClassName(const ClassName &other) noexcept = default; \
-    ClassName::ClassName(ClassName &&other) noexcept = default; \
-    ClassName::~ClassName() noexcept = default; \
-    ClassName &ClassName::operator=(const ClassName &other) noexcept = default;
+    ClassName::~ClassName() = default; \
+    ClassName &ClassName::operator=(const ClassName &other) noexcept = default; \
+    ClassName::ClassName() \
+    /* impl supplied by caller */
+
 
 /*!
     \class QCameraPermission
@@ -309,8 +312,10 @@ const void *QPermission::data(QMetaType requestedType) const
 
     \include permissions.qdocinc permission-metadata
 */
-class QCameraPermissionPrivate : public QSharedData {};
-QT_DEFINE_PERMISSION_SPECIAL_FUNCTIONS(QCameraPermission)
+
+QT_PERMISSION_IMPL_COMMON(QCameraPermission)
+    : u{} // stateless, atm
+{}
 
 /*!
     \class QMicrophonePermission
@@ -331,8 +336,10 @@ QT_DEFINE_PERMISSION_SPECIAL_FUNCTIONS(QCameraPermission)
 
     \include permissions.qdocinc permission-metadata
 */
-class QMicrophonePermissionPrivate : public QSharedData {};
-QT_DEFINE_PERMISSION_SPECIAL_FUNCTIONS(QMicrophonePermission)
+
+QT_PERMISSION_IMPL_COMMON(QMicrophonePermission)
+    : u{} // stateless, atm
+{}
 
 /*!
     \class QBluetoothPermission
@@ -353,8 +360,10 @@ QT_DEFINE_PERMISSION_SPECIAL_FUNCTIONS(QMicrophonePermission)
 
     \include permissions.qdocinc permission-metadata
 */
-class QBluetoothPermissionPrivate : public QSharedData {};
-QT_DEFINE_PERMISSION_SPECIAL_FUNCTIONS(QBluetoothPermission)
+
+QT_PERMISSION_IMPL_COMMON(QBluetoothPermission)
+    : u{} // stateless, atm
+{}
 
 /*!
     \class QLocationPermission
@@ -389,17 +398,10 @@ QT_DEFINE_PERMISSION_SPECIAL_FUNCTIONS(QBluetoothPermission)
 
     \include permissions.qdocinc permission-metadata
 */
-class QLocationPermissionPrivate : public QSharedData
-{
-public:
-    using Accuracy = QLocationPermission::Accuracy;
-    Accuracy accuracy = Accuracy::Approximate;
 
-    using Availability = QLocationPermission::Availability;
-    Availability availability = Availability::WhenInUse;
-};
-
-QT_DEFINE_PERMISSION_SPECIAL_FUNCTIONS(QLocationPermission)
+QT_PERMISSION_IMPL_COMMON(QLocationPermission)
+    : u{ShortData{Accuracy::Approximate, Availability::WhenInUse, {}}}
+{}
 
 /*!
     \enum QLocationPermission::Accuracy
@@ -426,8 +428,7 @@ QT_DEFINE_PERMISSION_SPECIAL_FUNCTIONS(QLocationPermission)
 */
 void QLocationPermission::setAccuracy(Accuracy accuracy)
 {
-    d.detach();
-    d->accuracy = accuracy;
+    u.data.accuracy = accuracy;
 }
 
 /*!
@@ -435,7 +436,7 @@ void QLocationPermission::setAccuracy(Accuracy accuracy)
 */
 QLocationPermission::Accuracy QLocationPermission::accuracy() const
 {
-    return d->accuracy;
+    return u.data.accuracy;
 }
 
 /*!
@@ -443,8 +444,7 @@ QLocationPermission::Accuracy QLocationPermission::accuracy() const
 */
 void QLocationPermission::setAvailability(Availability availability)
 {
-    d.detach();
-    d->availability = availability;
+    u.data.availability = availability;
 }
 
 /*!
@@ -452,7 +452,7 @@ void QLocationPermission::setAvailability(Availability availability)
 */
 QLocationPermission::Availability QLocationPermission::availability() const
 {
-    return d->availability;
+    return u.data.availability;
 }
 
 /*!
@@ -478,13 +478,10 @@ QLocationPermission::Availability QLocationPermission::availability() const
 
     \include permissions.qdocinc permission-metadata
 */
-class QContactsPermissionPrivate : public QSharedData
-{
-public:
-    bool isReadWrite = false;
-};
 
-QT_DEFINE_PERMISSION_SPECIAL_FUNCTIONS(QContactsPermission)
+QT_PERMISSION_IMPL_COMMON(QContactsPermission)
+    : u{ShortData{false, {}}}
+{}
 
 /*!
     Sets whether the request is for read-write (\a enable == \c true) or
@@ -492,8 +489,7 @@ QT_DEFINE_PERMISSION_SPECIAL_FUNCTIONS(QContactsPermission)
 */
 void QContactsPermission::setReadWrite(bool enable)
 {
-    d.detach();
-    d->isReadWrite = enable;
+    u.data.readWrite = enable;
 }
 
 /*!
@@ -502,7 +498,7 @@ void QContactsPermission::setReadWrite(bool enable)
 */
 bool QContactsPermission::isReadWrite() const
 {
-    return d->isReadWrite;
+    return u.data.readWrite;
 }
 
 /*!
@@ -528,13 +524,10 @@ bool QContactsPermission::isReadWrite() const
 
     \include permissions.qdocinc permission-metadata
 */
-class QCalendarPermissionPrivate : public QSharedData
-{
-public:
-    bool isReadWrite = false;
-};
 
-QT_DEFINE_PERMISSION_SPECIAL_FUNCTIONS(QCalendarPermission)
+QT_PERMISSION_IMPL_COMMON(QCalendarPermission)
+    : u{ShortData{false, {}}}
+{}
 
 /*!
     Sets whether the request is for read-write (\a enable == \c true) or
@@ -542,8 +535,7 @@ QT_DEFINE_PERMISSION_SPECIAL_FUNCTIONS(QCalendarPermission)
 */
 void QCalendarPermission::setReadWrite(bool enable)
 {
-    d.detach();
-    d->isReadWrite = enable;
+    u.data.readWrite = enable;
 }
 
 /*!
@@ -552,7 +544,7 @@ void QCalendarPermission::setReadWrite(bool enable)
 */
 bool QCalendarPermission::isReadWrite() const
 {
-    return d->isReadWrite;
+    return u.data.readWrite;
 }
 
 /*!
@@ -576,6 +568,8 @@ QDebug operator<<(QDebug debug, const QPermission &permission)
 }
 #endif
 
+#undef QT_PERMISSION_IMPL_COMMON
+
 QT_END_NAMESPACE
 
 #include "moc_qpermissions.cpp"
diff --git a/src/corelib/kernel/qpermissions.h b/src/corelib/kernel/qpermissions.h
index 9c47df3eb17..eb440c498ae 100644
--- a/src/corelib/kernel/qpermissions.h
+++ b/src/corelib/kernel/qpermissions.h
@@ -77,21 +77,28 @@ private:
     Q_GADGET_EXPORT(Q_CORE_EXPORT) \
     using QtPermissionHelper = void; \
     friend class QPermission; \
+    union U { \
+        U() : d(nullptr) {} \
+        U(ShortData _data) : data(_data) {} \
+        U(ClassName##Private *_d) : d(_d) {} \
+        ShortData data; \
+        ClassName##Private *d; \
+    } u; \
 public: \
     Q_CORE_EXPORT ClassName(); \
     Q_CORE_EXPORT ClassName(const ClassName &other) noexcept; \
-    Q_CORE_EXPORT ClassName(ClassName &&other) noexcept; \
-    Q_CORE_EXPORT ~ClassName() noexcept; \
+    ClassName(ClassName &&other) noexcept \
+        : u{other.u} { other.u.d = nullptr; } \
+    Q_CORE_EXPORT ~ClassName(); \
     Q_CORE_EXPORT ClassName &operator=(const ClassName &other) noexcept; \
     QT_MOVE_ASSIGNMENT_OPERATOR_IMPL_VIA_PURE_SWAP(ClassName) \
-    void swap(ClassName &other) noexcept { d.swap(other.d); } \
+    void swap(ClassName &other) noexcept { std::swap(u, other.u); } \
 private: \
-    QtPrivate::QExplicitlySharedDataPointerV2<ClassName##Private> d;
+    /*end*/
 
 class QLocationPermissionPrivate;
 class QLocationPermission
 {
-    QT_PERMISSION(QLocationPermission)
 public:
     enum Accuracy : quint8 {
         Approximate,
@@ -110,26 +117,46 @@ public:
 
     Q_CORE_EXPORT void setAvailability(Availability availability);
     Q_CORE_EXPORT Availability availability() const;
+
+private:
+    struct ShortData {
+        Accuracy accuracy;
+        Availability availability;
+        char reserved[sizeof(void*) - sizeof(accuracy) - sizeof(availability)];
+    };
+    QT_PERMISSION(QLocationPermission)
 };
 Q_DECLARE_SHARED(QLocationPermission)
 
 class QCalendarPermissionPrivate;
 class QCalendarPermission
 {
-    QT_PERMISSION(QCalendarPermission)
 public:
     Q_CORE_EXPORT void setReadWrite(bool enable);
     Q_CORE_EXPORT bool isReadWrite() const;
+
+private:
+    struct ShortData {
+        bool readWrite;
+        char reserved[sizeof(void*) - sizeof(readWrite)];
+    };
+    QT_PERMISSION(QCalendarPermission)
 };
 Q_DECLARE_SHARED(QCalendarPermission)
 
 class QContactsPermissionPrivate;
 class QContactsPermission
 {
-    QT_PERMISSION(QContactsPermission)
 public:
     Q_CORE_EXPORT void setReadWrite(bool enable);
     Q_CORE_EXPORT bool isReadWrite() const;
+
+private:
+    struct ShortData {
+        bool readWrite;
+        char reserved[sizeof(void*) - sizeof(readWrite)];
+    };
+    QT_PERMISSION(QContactsPermission)
 };
 Q_DECLARE_SHARED(QContactsPermission)
 
@@ -137,6 +164,7 @@ Q_DECLARE_SHARED(QContactsPermission)
     class ClassName##Private; \
     class ClassName \
     { \
+        struct ShortData { char reserved[sizeof(void*)]; }; \
         QT_PERMISSION(ClassName) \
     }; \
     Q_DECLARE_SHARED(ClassName)