ULONG FASTCALL MiMakeSystemAddressValidPfnWs( IN PVOID VirtualAddress, IN PEPROCESS CurrentProcess OPTIONAL ); Routine Description: This routine checks to see if the virtual address is valid, and if not makes it valid. Arguments: VirtualAddress - Supplies the virtual address to make valid. CurrentProcess - Supplies a pointer to the current process, if the working set lock is not held, this value is NULL. Return Value: Returns TRUE if lock released and wait performed, FALSE otherwise. Environment: Kernel mode, APCs disabled, PFN lock held, working set lock held if CurrentProcess != NULL.