diff --git a/reactos/hal/halx86/generic/processor.c b/reactos/hal/halx86/generic/processor.c
index 4b064ca2d35..90519ff9328 100644
--- a/reactos/hal/halx86/generic/processor.c
+++ b/reactos/hal/halx86/generic/processor.c
@@ -31,7 +31,7 @@ HalInitializeProcessor(IN ULONG ProcessorNumber,
 
     /* Update the interrupt affinity and processor mask */
     InterlockedBitTestAndSet(&HalpActiveProcessors, ProcessorNumber);
-    InterlockedBitTestAndSet(&HalpDefaultInterruptAffinity, ProcessorNumber);
+    InterlockedBitTestAndSet((PLONG)&HalpDefaultInterruptAffinity, ProcessorNumber);
 
     /* FIXME: Register routines for KDCOM */
 }
diff --git a/reactos/include/ddk/winddk.h b/reactos/include/ddk/winddk.h
index 70886f9e164..912006579c7 100644
--- a/reactos/include/ddk/winddk.h
+++ b/reactos/include/ddk/winddk.h
@@ -7036,12 +7036,6 @@ ExSystemTimeToLocalTime(
   IN PLARGE_INTEGER  SystemTime,
   OUT PLARGE_INTEGER  LocalTime);
 
-NTKERNELAPI
-BOOLEAN
-NTAPI
-ExTryToAcquireResourceExclusiveLite(
-  IN PERESOURCE  Resource);
-
 NTKERNELAPI
 VOID
 NTAPI
diff --git a/reactos/include/ndk/exfuncs.h b/reactos/include/ndk/exfuncs.h
index 43c958a0883..fbcb8b003cd 100644
--- a/reactos/include/ndk/exfuncs.h
+++ b/reactos/include/ndk/exfuncs.h
@@ -96,6 +96,7 @@ ExfUnblockPushLock(
 //
 // Resource Functions
 //
+NTKERNELAPI
 BOOLEAN
 NTAPI
 ExTryToAcquireResourceExclusiveLite(
@@ -151,6 +152,7 @@ NtCreateEventPair(
     IN POBJECT_ATTRIBUTES ObjectAttributes
 );
 
+NTSYSCALLAPI
 NTSTATUS
 NTAPI
 NtCreateKeyedEvent(
@@ -205,7 +207,7 @@ NtDisplayString(
     IN PUNICODE_STRING DisplayString
 );
 
-
+NTSYSCALLAPI
 NTSTATUS
 NTAPI
 NtEnumerateSystemEnvironmentValuesEx(
@@ -361,6 +363,7 @@ NtQuerySystemEnvironmentValue(
     PULONG ReturnLength
 );
 
+NTSYSCALLAPI
 NTSTATUS
 NTAPI
 NtQuerySystemEnvironmentValueEx(
@@ -509,6 +512,7 @@ NtSetSystemEnvironmentValue(
     IN PUNICODE_STRING Value
 );
 
+NTSYSCALLAPI
 NTSTATUS
 NTAPI
 NtSetSystemEnvironmentValueEx(
diff --git a/reactos/include/ndk/psfuncs.h b/reactos/include/ndk/psfuncs.h
index 213e1fc9ebb..b47f5339846 100644
--- a/reactos/include/ndk/psfuncs.h
+++ b/reactos/include/ndk/psfuncs.h
@@ -30,24 +30,28 @@ Author:
 //
 // Win32K Process/Thread Functions
 //
+NTKERNELAPI
 struct _W32THREAD*
 NTAPI
 PsGetCurrentThreadWin32Thread(
     VOID
 );
 
+NTKERNELAPI
 struct _W32PROCESS*
 NTAPI
 PsGetCurrentProcessWin32Process(
     VOID
 );
 
+NTKERNELAPI
 PVOID
 NTAPI
 PsGetProcessWin32Process(
     PEPROCESS Process
 );
 
+NTKERNELAPI
 VOID
 NTAPI
 PsSetProcessWin32Process(
@@ -55,6 +59,7 @@ PsSetProcessWin32Process(
     PVOID Win32Process
 );
 
+NTKERNELAPI
 VOID
 NTAPI
 PsSetThreadWin32Thread(
@@ -62,18 +67,21 @@ PsSetThreadWin32Thread(
     PVOID Win32Thread
 );
 
+NTKERNELAPI
 PVOID
 NTAPI
 PsGetThreadWin32Thread(
     PETHREAD Thread
 );
 
+NTKERNELAPI
 BOOLEAN
 NTAPI
 PsGetThreadHardErrorsAreDisabled(
     PETHREAD Thread
 );
 
+NTKERNELAPI
 VOID 
 NTAPI
 PsSetThreadHardErrorsAreDisabled(
@@ -81,12 +89,14 @@ PsSetThreadHardErrorsAreDisabled(
     IN BOOLEAN Disabled
 );
 
+NTKERNELAPI
 VOID 
 NTAPI
 PsEstablishWin32Callouts(
     PWIN32_CALLOUTS_FPNS CalloutData
 );
 
+NTKERNELAPI
 VOID
 NTAPI
 PsReturnProcessNonPagedPoolQuota(
@@ -97,6 +107,7 @@ PsReturnProcessNonPagedPoolQuota(
 //
 // Process Impersonation Functions
 //
+NTKERNELAPI
 VOID
 NTAPI
 PsRevertThreadToSelf(
@@ -106,10 +117,12 @@ PsRevertThreadToSelf(
 //
 // Misc. Functions
 //
+NTKERNELAPI
 HANDLE
 NTAPI
 PsGetProcessId(PEPROCESS Process);
 
+NTKERNELAPI
 NTSTATUS
 NTAPI
 PsLookupProcessThreadByCid(
@@ -132,6 +145,7 @@ NtAlertResumeThread(
 );
 
 typedef ULONG APPHELPCACHESERVICECLASS;
+NTSYSCALLAPI
 NTSTATUS
 NTAPI
 NtApphelpCacheControl(
diff --git a/reactos/ntoskrnl/dbgk/dbgkutil.c b/reactos/ntoskrnl/dbgk/dbgkutil.c
index 26c898b326e..9a6b91d3c3d 100644
--- a/reactos/ntoskrnl/dbgk/dbgkutil.c
+++ b/reactos/ntoskrnl/dbgk/dbgkutil.c
@@ -104,7 +104,7 @@ DbgkCreateThread(PVOID StartAddress)
     PAGED_CODE();
 
     /* Check if this process has already been notified */
-    ProcessFlags = InterlockedAnd(&Process->Flags,
+    ProcessFlags = InterlockedAnd((PLONG)&Process->Flags,
                                   PSF_CREATE_REPORTED_BIT |
                                   PSF_IMAGE_NOTIFY_DONE_BIT);
     if (!(ProcessFlags & PSF_IMAGE_NOTIFY_DONE_BIT) && (PsImageNotifyEnabled))
diff --git a/reactos/ntoskrnl/dbgk/debug.c b/reactos/ntoskrnl/dbgk/debug.c
index 2a02b852276..5a059691a29 100644
--- a/reactos/ntoskrnl/dbgk/debug.c
+++ b/reactos/ntoskrnl/dbgk/debug.c
@@ -1055,8 +1055,9 @@ ThreadScan:
         else
         {
             /* Set the process flags */
-            InterlockedOr(&Process->Flags, PSF_NO_DEBUG_INHERIT_BIT |
-                                           PSF_CREATE_REPORTED_BIT);
+            InterlockedOr((PLONG)&Process->Flags,
+                          PSF_NO_DEBUG_INHERIT_BIT |
+                          PSF_CREATE_REPORTED_BIT);
 
             /* Reference the debug object */
             ObDereferenceObject(DebugObject);
diff --git a/reactos/ntoskrnl/fs/filelock.c b/reactos/ntoskrnl/fs/filelock.c
index 866542de7fa..1bd4fe52e77 100644
--- a/reactos/ntoskrnl/fs/filelock.c
+++ b/reactos/ntoskrnl/fs/filelock.c
@@ -1068,7 +1068,7 @@ FsRtlUninitializeFileLock(IN PFILE_LOCK FileLock)
 
         /* Acquire cancel spinlock and clear the cancel routine */
         IoAcquireCancelSpinLock(&Irp->CancelIrql);
-        IoSetCancelRoutine(Irp, NULL);
+        (void)IoSetCancelRoutine(Irp, NULL);
         IoReleaseCancelSpinLock(Irp->CancelIrql);
 
         /* Complete the IRP */
diff --git a/reactos/ntoskrnl/fstub/disksup.c b/reactos/ntoskrnl/fstub/disksup.c
index 0905441a4cb..187dace16e1 100644
--- a/reactos/ntoskrnl/fstub/disksup.c
+++ b/reactos/ntoskrnl/fstub/disksup.c
@@ -1329,7 +1329,8 @@ IoReadPartitionTable(IN PDEVICE_OBJECT DeviceObject,
     PDRIVE_LAYOUT_INFORMATION DriveLayoutInfo = NULL;
     LONG j = -1, i = -1, k;
     DISK_GEOMETRY DiskGeometry;
-    LONGLONG EndSector, MaxSector, StartOffset, MaxOffset;
+    LONGLONG EndSector, MaxSector, StartOffset;
+    ULONGLONG MaxOffset;
     LARGE_INTEGER Offset, VolumeOffset;
     BOOLEAN IsPrimary = TRUE, IsEzDrive = FALSE, MbrFound = FALSE;
     BOOLEAN IsValid, IsEmpty = TRUE;