59 	 * We fault-in kernel-space virtual memory on-demand. The  in do_page_fault()
62 	 * NOTE! We MUST NOT take any locks for this case. We may  in do_page_fault()
68 	 * mappings we don't have to walk all processes pgdirs and  in do_page_fault()
69 	 * add the high mappings all at once. Instead we do it as they  in do_page_fault()
82 	/* If exceptions were enabled, we can reenable them here */  in do_page_fault()
100 	 * If we're in an interrupt or have no user  in do_page_fault()
101 	 * context, we must not take the fault..  in do_page_fault()
125 		 * we get page-aligned addresses so we can only check  in do_page_fault()
126 		 * if we're within a page from usp, but that might be  in do_page_fault()
136 	 * Ok, we have a good vm_area for this memory access, so  in do_page_fault()
137 	 * we can handle it..  in do_page_fault()
155 	/* are we trying to execute nonexecutable area */  in do_page_fault()
160 	 * If for any reason at all we couldn't handle the fault,  in do_page_fault()
161 	 * make sure we exit gracefully rather than endlessly redo  in do_page_fault()
185 			 /* No need to mmap_read_unlock(mm) as we would  in do_page_fault()
216 	/* Are we prepared to handle this kernel fault?  in do_page_fault()
220 	 *  of those points, we find it in a table and do a jump  in do_page_fault()
238 	 * Oops. The kernel tried to access some bad page. We'll have to  in do_page_fault()
254 	 * We ran out of memory, or some other thing happened to us that made  in do_page_fault()
272 	 * Send a sigbus, regardless of whether we were in kernel  in do_page_fault()
305 			 "anyhow we don't need this at the moment\n");  in do_page_fault()
312 		/* Since we're two-level, we don't need to do both  in do_page_fault()
314 		 * we go three-level at some point, do the right thing  in do_page_fault()
317 		 * Also, since the vmalloc area is global, we don't  in do_page_fault()
320 		 * root task. If that is there, we'll find our pte if  in do_page_fault()
344 		 * addresses. If we don't do this, this will just  in do_page_fault()