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MmUnmapLockedPages function (wdm.h)

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The MmUnmapLockedPages routine releases a mapping that was set up by a preceding call to the MmMapLockedPages or MmMapLockedPagesSpecifyCache routine.

Syntax

void MmUnmapLockedPages(
  [in] PVOID BaseAddress,
  [in] PMDL  MemoryDescriptorList
);

Parameters

[in] BaseAddress

Pointer to the base virtual address to which the physical pages were mapped.

[in] MemoryDescriptorList

Pointer to an MDL.

Return value

None

Remarks

Callers of MmUnmapLockedPages must be running at IRQL <= DISPATCH_LEVEL if the pages were mapped to system space. Otherwise, the caller must be running at IRQL <= APC_LEVEL.

Note that if the call to MmMapLockedPages or MmMapLockedPagesSpecifyCache specified user mode, the caller must be in the context of the original process before calling MmUnmapLockedPages. This is because the unmapping operation occurs in the context of the calling process, and, if the context is incorrect, the unmapping operation could delete the address range of a random process.

Requirements

Requirement Value
Minimum supported client Available starting with Windows 2000.
Target Platform Universal
Header wdm.h (include Wdm.h, Ntddk.h, Ntifs.h)
Library NtosKrnl.lib
DLL NtosKrnl.exe
IRQL See Remarks section.
DDI compliance rules HwStorPortProhibitedDDIs(storport)

See also

MmMapLockedPages

MmMapLockedPagesSpecifyCache