[PATCH 1/4] ntoskrnl.exe: Implement KeReleaseSpinLockFromDpcLevel().

[Zebediah Figura]

Signed-off-by: Zebediah Figura <z.figura12 at gmail.com>
---
 dlls/ntoskrnl.exe/ntoskrnl.exe.spec |  2 +-
 dlls/ntoskrnl.exe/sync.c            | 11 ++++++++++-
 include/ddk/wdm.h                   |  1 +
 3 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/dlls/ntoskrnl.exe/ntoskrnl.exe.spec b/dlls/ntoskrnl.exe/ntoskrnl.exe.spec
index 28794d16de..e861000f26 100644
--- a/dlls/ntoskrnl.exe/ntoskrnl.exe.spec
+++ b/dlls/ntoskrnl.exe/ntoskrnl.exe.spec
@@ -594,7 +594,7 @@
 @ stdcall KeReleaseMutex(ptr long)
 @ stdcall KeReleaseSemaphore(ptr long long long)
 @ stdcall -arch=arm,arm64,x86_64 KeReleaseSpinLock(ptr long)
-@ stub KeReleaseSpinLockFromDpcLevel
+@ stdcall KeReleaseSpinLockFromDpcLevel(ptr)
 @ stub KeRemoveByKeyDeviceQueue
 @ stub KeRemoveByKeyDeviceQueueIfBusy
 @ stub KeRemoveDeviceQueue
diff --git a/dlls/ntoskrnl.exe/sync.c b/dlls/ntoskrnl.exe/sync.c
index 475fcf1804..b439695fd7 100644
--- a/dlls/ntoskrnl.exe/sync.c
+++ b/dlls/ntoskrnl.exe/sync.c
@@ -386,7 +386,6 @@ void WINAPI KeInitializeSpinLock( KSPIN_LOCK *lock )
     *lock = 0;
 }
 
-#ifndef __i386__
 static inline void small_pause(void)
 {
 #ifdef __x86_64__
@@ -396,6 +395,16 @@ static inline void small_pause(void)
 #endif
 }
 
+/***********************************************************************
+ *           KeReleaseSpinLockFromDpcLevel (NTOSKRNL.EXE.@)
+ */
+void WINAPI KeReleaseSpinLockFromDpcLevel( KSPIN_LOCK *lock )
+{
+    TRACE("lock %p.\n", lock);
+    InterlockedExchangePointer( (void **)lock, 0 );
+}
+
+#ifndef __i386__
 /***********************************************************************
  *           KeReleaseSpinLock (NTOSKRNL.EXE.@)
  */
diff --git a/include/ddk/wdm.h b/include/ddk/wdm.h
index ccaf5feb57..908e71c72d 100644
--- a/include/ddk/wdm.h
+++ b/include/ddk/wdm.h
@@ -1471,6 +1471,7 @@ BOOLEAN   WINAPI KeRegisterBugCheckReasonCallback(KBUGCHECK_REASON_CALLBACK_RECO
 LONG      WINAPI KeReleaseMutex(PRKMUTEX,BOOLEAN);
 LONG      WINAPI KeReleaseSemaphore(PRKSEMAPHORE,KPRIORITY,LONG,BOOLEAN);
 void      WINAPI KeReleaseSpinLock(KSPIN_LOCK*,KIRQL);
+void      WINAPI KeReleaseSpinLockFromDpcLevel(KSPIN_LOCK*);
 LONG      WINAPI KeResetEvent(PRKEVENT);
 LONG      WINAPI KeSetEvent(PRKEVENT,KPRIORITY,BOOLEAN);
 KPRIORITY WINAPI KeSetPriorityThread(PKTHREAD,KPRIORITY);
-- 
2.20.1