31  *	close(fd) or exit process to close window.
69 	 * Window opened by a child thread may not be closed when  in get_vas_user_win_ref()
71 	 * when the window is free by parent thread.  in get_vas_user_win_ref()
91 	 * Process closes window during exit. In the case of  in get_vas_user_win_ref()
93 	 * window and can exit without closing it. So takes tgid  in get_vas_user_win_ref()
94 	 * reference until window closed to make sure tgid is not  in get_vas_user_win_ref()
118 		 * Parent thread (tgid) will be closing window when it  in ref_get_pid_and_task()
182 	 * Process closes send window after all pending NX requests are  in vas_update_csb()
184 	 * open a window and can exit without closing it. May be some  in vas_update_csb()
185 	 * requests are pending or this window can be used by other  in vas_update_csb()
189 	 * invalid, send SEGV signal to pid saved in window. If the  in vas_update_csb()
191 	 * Parent thread (tgid) will close this window upon its exit.  in vas_update_csb()
193 	 * pid and mm references are taken when window is opened by  in vas_update_csb()
195 	 * a window and exits without closing it.  in vas_update_csb()
291 	 * One window for file descriptor  in coproc_ioc_tx_win_open()
303 		pr_err("Invalid window open API version\n");  in coproc_ioc_tx_win_open()
315 		pr_err_ratelimited("VAS window open failed rc=%ld\n",  in coproc_ioc_tx_win_open()
392  * the paste address. Happens if the kernel closes window in hypervisor
406 	 * window is not opened. Shouldn't expect this error.  in vas_mmap_fault()
409 		pr_err("Unexpected fault on paste address with TX window closed\n");  in vas_mmap_fault()
430 	 * The window may be inactive due to lost credit (Ex: core  in vas_mmap_fault()
431 	 * removal with DLPAR). If the window is active again when  in vas_mmap_fault()
433 	 * window virtual address.  in vas_mmap_fault()
447 	 * Received this fault due to closing the actual window.  in vas_mmap_fault()
468  * During mmap() paste address, mapping VMA is saved in VAS window
469  * struct which is used to unmap during migration if the window is
471  * munmap() before closing the window and the VMA address will
472  * be invalid. Set VAS window VMA to NULL in this function which
483 		pr_err("No attached VAS window for the paste address mmap\n");  in vas_mmap_close()
524 	/* Ensure instance has an open send window */  in coproc_mmap()
526 		pr_err("No send window open?\n");  in coproc_mmap()
536 	 * The initial mmap is done after the window is opened  in coproc_mmap()
537 	 * with ioctl. But before mmap(), this window can be closed in  in coproc_mmap()
539 	 * So if the window is not active, return mmap() failure with  in coproc_mmap()
541 	 * is active again or open new window when the credit is available.  in coproc_mmap()
543 	 * close/open event and allows mmap() only when the window is  in coproc_mmap()
548 		pr_err("Window is not active\n");  in coproc_mmap()
555 		pr_err("Window paste address failed\n");  in coproc_mmap()