1127 static int xol_add_vma(struct mm_struct *mm, struct xol_area *area)  in xol_add_vma()  argument
1138 	if (!area->vaddr) {  in xol_add_vma()
1140 		area->vaddr = get_unmapped_area(NULL, TASK_SIZE - PAGE_SIZE,  in xol_add_vma()
1142 		if (area->vaddr & ~PAGE_MASK) {  in xol_add_vma()
1143 			ret = area->vaddr;  in xol_add_vma()
1148 	vma = _install_special_mapping(mm, area->vaddr, PAGE_SIZE,  in xol_add_vma()
1150 				&area->xol_mapping);  in xol_add_vma()
1158 	mm->uprobes_state.xol_area = area;  in xol_add_vma()
1169 	struct xol_area *area;  in __create_xol_area()  local
1171 	area = kmalloc(sizeof(*area), GFP_KERNEL);  in __create_xol_area()
1172 	if (unlikely(!area))  in __create_xol_area()
1175 	area->bitmap = kzalloc(BITS_TO_LONGS(UINSNS_PER_PAGE) * sizeof(long), GFP_KERNEL);  in __create_xol_area()
1176 	if (!area->bitmap)  in __create_xol_area()
1179 	area->xol_mapping.name = "[uprobes]";  in __create_xol_area()
1180 	area->xol_mapping.pages = area->pages;  in __create_xol_area()
1181 	area->pages[0] = alloc_page(GFP_HIGHUSER);  in __create_xol_area()
1182 	if (!area->pages[0])  in __create_xol_area()
1184 	area->pages[1] = NULL;  in __create_xol_area()
1186 	area->vaddr = vaddr;  in __create_xol_area()
1187 	init_waitqueue_head(&area->wq);  in __create_xol_area()
1189 	set_bit(0, area->bitmap);  in __create_xol_area()
1190 	atomic_set(&area->slot_count, 1);  in __create_xol_area()
1191 	copy_to_page(area->pages[0], 0, &insn, UPROBE_SWBP_INSN_SIZE);  in __create_xol_area()
1193 	if (!xol_add_vma(mm, area))  in __create_xol_area()
1194 		return area;  in __create_xol_area()
1196 	__free_page(area->pages[0]);  in __create_xol_area()
1198 	kfree(area->bitmap);  in __create_xol_area()
1200 	kfree(area);  in __create_xol_area()
1214 	struct xol_area *area;  in get_xol_area()  local
1219 	area = mm->uprobes_state.xol_area;  in get_xol_area()
1221 	return area;  in get_xol_area()
1229 	struct xol_area *area = mm->uprobes_state.xol_area;  in uprobe_clear_state()  local
1231 	if (!area)  in uprobe_clear_state()
1234 	put_page(area->pages[0]);  in uprobe_clear_state()
1235 	kfree(area->bitmap);  in uprobe_clear_state()
1236 	kfree(area);  in uprobe_clear_state()
1263 static unsigned long xol_take_insn_slot(struct xol_area *area)  in xol_take_insn_slot()  argument
1269 		slot_nr = find_first_zero_bit(area->bitmap, UINSNS_PER_PAGE);  in xol_take_insn_slot()
1271 			if (!test_and_set_bit(slot_nr, area->bitmap))  in xol_take_insn_slot()
1277 		wait_event(area->wq, (atomic_read(&area->slot_count) < UINSNS_PER_PAGE));  in xol_take_insn_slot()
1280 	slot_addr = area->vaddr + (slot_nr * UPROBE_XOL_SLOT_BYTES);  in xol_take_insn_slot()
1281 	atomic_inc(&area->slot_count);  in xol_take_insn_slot()
1292 	struct xol_area *area;  in xol_get_insn_slot()  local
1295 	area = get_xol_area();  in xol_get_insn_slot()
1296 	if (!area)  in xol_get_insn_slot()
1299 	xol_vaddr = xol_take_insn_slot(area);  in xol_get_insn_slot()
1303 	arch_uprobe_copy_ixol(area->pages[0], xol_vaddr,  in xol_get_insn_slot()
1316 	struct xol_area *area;  in xol_free_insn_slot()  local
1327 	area = tsk->mm->uprobes_state.xol_area;  in xol_free_insn_slot()
1328 	vma_end = area->vaddr + PAGE_SIZE;  in xol_free_insn_slot()
1329 	if (area->vaddr <= slot_addr && slot_addr < vma_end) {  in xol_free_insn_slot()
1333 		offset = slot_addr - area->vaddr;  in xol_free_insn_slot()
1338 		clear_bit(slot_nr, area->bitmap);  in xol_free_insn_slot()
1339 		atomic_dec(&area->slot_count);  in xol_free_insn_slot()
1341 		if (waitqueue_active(&area->wq))  in xol_free_insn_slot()
1342 			wake_up(&area->wq);  in xol_free_insn_slot()
1481 	struct xol_area *area;  in uprobe_copy_process()  local
1495 	area = mm->uprobes_state.xol_area;  in uprobe_copy_process()
1496 	if (!area)  in uprobe_copy_process()
1502 	t->utask->dup_xol_addr = area->vaddr;  in uprobe_copy_process()
1515 	struct xol_area *area;  in get_trampoline_vaddr()  local
1518 	area = current->mm->uprobes_state.xol_area;  in get_trampoline_vaddr()
1520 	if (area)  in get_trampoline_vaddr()
1521 		trampoline_vaddr = area->vaddr;  in get_trampoline_vaddr()