52 	void *dest_mapping =  in kernel_support_for_mremap_dontunmap()  local
55 	if (dest_mapping == MAP_FAILED) {  in kernel_support_for_mremap_dontunmap()
58 		BUG_ON(munmap(dest_mapping, num_pages * page_size) == -1,  in kernel_support_for_mremap_dontunmap()
107 	void *dest_mapping =  in mremap_dontunmap_simple()  local
110 	BUG_ON(dest_mapping == MAP_FAILED, "mremap");  in mremap_dontunmap_simple()
115 	       (dest_mapping, num_pages * page_size, 'a') != 0,  in mremap_dontunmap_simple()
121 	BUG_ON(munmap(dest_mapping, num_pages * page_size) == -1,  in mremap_dontunmap_simple()
148 	void *dest_mapping =  in mremap_dontunmap_simple_shmem()  local
151 	if (dest_mapping == MAP_FAILED && errno == EINVAL) {  in mremap_dontunmap_simple_shmem()
158 	BUG_ON(dest_mapping == MAP_FAILED, "mremap");  in mremap_dontunmap_simple_shmem()
163 	       (dest_mapping, num_pages * page_size, 'a') != 0,  in mremap_dontunmap_simple_shmem()
172 	BUG_ON(munmap(dest_mapping, num_pages * page_size) == -1,  in mremap_dontunmap_simple_shmem()
187 	void *dest_mapping =  in mremap_dontunmap_simple_fixed()  local
190 	BUG_ON(dest_mapping == MAP_FAILED, "mmap");  in mremap_dontunmap_simple_fixed()
191 	memset(dest_mapping, 'X', num_pages * page_size);  in mremap_dontunmap_simple_fixed()
202 		   dest_mapping);  in mremap_dontunmap_simple_fixed()
204 	BUG_ON(remapped_mapping != dest_mapping,  in mremap_dontunmap_simple_fixed()
210 	       (dest_mapping, num_pages * page_size, 'a') != 0,  in mremap_dontunmap_simple_fixed()
218 	BUG_ON(munmap(dest_mapping, num_pages * page_size) == -1,  in mremap_dontunmap_simple_fixed()
250 	void *dest_mapping =  in mremap_dontunmap_partial_mapping()  local
254 	BUG_ON(dest_mapping == MAP_FAILED, "mremap");  in mremap_dontunmap_partial_mapping()
265 	BUG_ON(check_region_contains_byte(dest_mapping, 5 * page_size, 'a') !=  in mremap_dontunmap_partial_mapping()
268 	BUG_ON(munmap(dest_mapping, 5 * page_size) == -1,  in mremap_dontunmap_partial_mapping()
301 	void *dest_mapping =  in mremap_dontunmap_partial_mapping_overwrite()  local
304 	BUG_ON(dest_mapping == MAP_FAILED, "mmap");  in mremap_dontunmap_partial_mapping_overwrite()
305 	memset(dest_mapping, 'X', 10 * page_size);  in mremap_dontunmap_partial_mapping_overwrite()
311 		   MREMAP_DONTUNMAP | MREMAP_MAYMOVE | MREMAP_FIXED, dest_mapping);  in mremap_dontunmap_partial_mapping_overwrite()
312 	BUG_ON(dest_mapping == MAP_FAILED, "mremap");  in mremap_dontunmap_partial_mapping_overwrite()
313 	BUG_ON(dest_mapping != remapped_mapping, "expected to remap to dest_mapping");  in mremap_dontunmap_partial_mapping_overwrite()
319 	BUG_ON(check_region_contains_byte(dest_mapping, 5 * page_size, 'a') != 0,  in mremap_dontunmap_partial_mapping_overwrite()
323 	BUG_ON(check_region_contains_byte(dest_mapping + (5 * page_size),  in mremap_dontunmap_partial_mapping_overwrite()
327 	BUG_ON(munmap(dest_mapping, 10 * page_size) == -1,  in mremap_dontunmap_partial_mapping_overwrite()