pmt_unpin - unpin pages and revoke device access to them
#include <zircon/syscalls.h> zx_status_t zx_pmt_unpin(zx_handle_t pmt);
pmt_unpin() unpins pages that were previously pinned by bti_pin(), and revokes the access that was granted by the pin call.
On success, this syscall consumes the handle pmt. It is invalid to use pmt afterwards, including to call handle_close() on it.
On success, pmt_unpin() returns ZX_OK. In the event of failure, a negative error value is returned.
ZX_ERR_BAD_HANDLE pmt is not a valid handle.
ZX_ERR_WRONG_TYPE pmt is not a PMT handle.