selftests/mm/mremap_dontunmap.c

19 unsigned long page_size;
46 	void *source_mapping = mmap(NULL, num_pages * page_size, PROT_NONE,
53 	    mremap(source_mapping, num_pages * page_size, num_pages * page_size,
58 		BUG_ON(munmap(dest_mapping, num_pages * page_size) == -1,
62 	BUG_ON(munmap(source_mapping, num_pages * page_size) == -1,
71 	BUG_ON(size & (page_size - 1),
73 	BUG_ON((unsigned long)addr & (page_size - 1),
76 	memset(page_buffer, byte, page_size);
78 	unsigned long num_pages = size / page_size;
84 		    memcmp(addr + (i * page_size), page_buffer, page_size);
100 	    mmap(NULL, num_pages * page_size, PROT_READ | PROT_WRITE,
104 	memset(source_mapping, 'a', num_pages * page_size);
108 	    mremap(source_mapping, num_pages * page_size, num_pages * page_size,
115 	       (dest_mapping, num_pages * page_size, 'a') != 0,
118 	       (source_mapping, num_pages * page_size, 0) != 0,
121 	BUG_ON(munmap(dest_mapping, num_pages * page_size) == -1,
123 	BUG_ON(munmap(source_mapping, num_pages * page_size) == -1,
136 	BUG_ON(ftruncate(mem_fd, num_pages * page_size) < 0,
140 	    mmap(NULL, num_pages * page_size, PROT_READ | PROT_WRITE,
146 	memset(source_mapping, 'a', num_pages * page_size);
150 	    mremap(source_mapping, num_pages * page_size, num_pages * page_size,
154 		BUG_ON(munmap(source_mapping, num_pages * page_size) == -1,
164 	       (dest_mapping, num_pages * page_size, 'a') != 0,
170 	       (source_mapping, num_pages * page_size, 'a') != 0,
173 	BUG_ON(munmap(dest_mapping, num_pages * page_size) == -1,
175 	BUG_ON(munmap(source_mapping, num_pages * page_size) == -1,
190 	    mmap(NULL, num_pages * page_size, PROT_READ | PROT_WRITE,
193 	memset(dest_mapping, 'X', num_pages * page_size);
196 	    mmap(NULL, num_pages * page_size, PROT_READ | PROT_WRITE,
199 	memset(source_mapping, 'a', num_pages * page_size);
202 	    mremap(source_mapping, num_pages * page_size, num_pages * page_size,
212 	       (dest_mapping, num_pages * page_size, 'a') != 0,
217 	       (source_mapping, num_pages * page_size, 0) != 0,
220 	BUG_ON(munmap(dest_mapping, num_pages * page_size) == -1,
222 	BUG_ON(munmap(source_mapping, num_pages * page_size) == -1,
247 	    mmap(NULL, num_pages * page_size, PROT_READ | PROT_WRITE,
250 	memset(source_mapping, 'a', num_pages * page_size);
254 	    mremap(source_mapping + (5 * page_size), 5 * page_size,
255 		   5 * page_size,
261 	BUG_ON(check_region_contains_byte(source_mapping, 5 * page_size, 'a') !=
264 	       (source_mapping + (5 * page_size), 5 * page_size, 0) != 0,
268 	BUG_ON(check_region_contains_byte(dest_mapping, 5 * page_size, 'a') !=
271 	BUG_ON(munmap(dest_mapping, 5 * page_size) == -1,
273 	BUG_ON(munmap(source_mapping, num_pages * page_size) == -1,
300 	    mmap(NULL, 5 * page_size, PROT_READ | PROT_WRITE,
303 	memset(source_mapping, 'a', 5 * page_size);
306 	    mmap(NULL, 10 * page_size, PROT_READ | PROT_WRITE,
309 	memset(dest_mapping, 'X', 10 * page_size);
313 	    mremap(source_mapping, 5 * page_size,
314 		   5 * page_size,
319 	BUG_ON(check_region_contains_byte(source_mapping, 5 * page_size, 0) !=
323 	BUG_ON(check_region_contains_byte(dest_mapping, 5 * page_size, 'a') != 0,
327 	BUG_ON(check_region_contains_byte(dest_mapping + (5 * page_size),
328 				5 * page_size, 'X') != 0,
331 	BUG_ON(munmap(dest_mapping, 10 * page_size) == -1,
333 	BUG_ON(munmap(source_mapping, 5 * page_size) == -1,
342 	page_size = sysconf(_SC_PAGE_SIZE);
355 	    mmap(NULL, page_size, PROT_READ | PROT_WRITE,
365 	BUG_ON(munmap(page_buffer, page_size) == -1,