55 	void *dest_mapping =  in kernel_support_for_mremap_dontunmap()  local
58 	if (dest_mapping == MAP_FAILED) {  in kernel_support_for_mremap_dontunmap()
61 		BUG_ON(munmap(dest_mapping, num_pages * page_size) == -1,  in kernel_support_for_mremap_dontunmap()
110 	void *dest_mapping =  in mremap_dontunmap_simple()  local
113 	BUG_ON(dest_mapping == MAP_FAILED, "mremap");  in mremap_dontunmap_simple()
118 	       (dest_mapping, num_pages * page_size, 'a') != 0,  in mremap_dontunmap_simple()
124 	BUG_ON(munmap(dest_mapping, num_pages * page_size) == -1,  in mremap_dontunmap_simple()
151 	void *dest_mapping =  in mremap_dontunmap_simple_shmem()  local
154 	if (dest_mapping == MAP_FAILED && errno == EINVAL) {  in mremap_dontunmap_simple_shmem()
161 	BUG_ON(dest_mapping == MAP_FAILED, "mremap");  in mremap_dontunmap_simple_shmem()
166 	       (dest_mapping, num_pages * page_size, 'a') != 0,  in mremap_dontunmap_simple_shmem()
175 	BUG_ON(munmap(dest_mapping, num_pages * page_size) == -1,  in mremap_dontunmap_simple_shmem()
190 	void *dest_mapping =  in mremap_dontunmap_simple_fixed()  local
193 	BUG_ON(dest_mapping == MAP_FAILED, "mmap");  in mremap_dontunmap_simple_fixed()
194 	memset(dest_mapping, 'X', num_pages * page_size);  in mremap_dontunmap_simple_fixed()
205 		   dest_mapping);  in mremap_dontunmap_simple_fixed()
207 	BUG_ON(remapped_mapping != dest_mapping,  in mremap_dontunmap_simple_fixed()
213 	       (dest_mapping, num_pages * page_size, 'a') != 0,  in mremap_dontunmap_simple_fixed()
221 	BUG_ON(munmap(dest_mapping, num_pages * page_size) == -1,  in mremap_dontunmap_simple_fixed()
253 	void *dest_mapping =  in mremap_dontunmap_partial_mapping()  local
257 	BUG_ON(dest_mapping == MAP_FAILED, "mremap");  in mremap_dontunmap_partial_mapping()
268 	BUG_ON(check_region_contains_byte(dest_mapping, 5 * page_size, 'a') !=  in mremap_dontunmap_partial_mapping()
271 	BUG_ON(munmap(dest_mapping, 5 * page_size) == -1,  in mremap_dontunmap_partial_mapping()
304 	void *dest_mapping =  in mremap_dontunmap_partial_mapping_overwrite()  local
307 	BUG_ON(dest_mapping == MAP_FAILED, "mmap");  in mremap_dontunmap_partial_mapping_overwrite()
308 	memset(dest_mapping, 'X', 10 * page_size);  in mremap_dontunmap_partial_mapping_overwrite()
314 		   MREMAP_DONTUNMAP | MREMAP_MAYMOVE | MREMAP_FIXED, dest_mapping);  in mremap_dontunmap_partial_mapping_overwrite()
315 	BUG_ON(dest_mapping == MAP_FAILED, "mremap");  in mremap_dontunmap_partial_mapping_overwrite()
316 	BUG_ON(dest_mapping != remapped_mapping, "expected to remap to dest_mapping");  in mremap_dontunmap_partial_mapping_overwrite()
322 	BUG_ON(check_region_contains_byte(dest_mapping, 5 * page_size, 'a') != 0,  in mremap_dontunmap_partial_mapping_overwrite()
326 	BUG_ON(check_region_contains_byte(dest_mapping + (5 * page_size),  in mremap_dontunmap_partial_mapping_overwrite()
330 	BUG_ON(munmap(dest_mapping, 10 * page_size) == -1,  in mremap_dontunmap_partial_mapping_overwrite()