329 	/* Establish a guard page at the end of the mapping. */  in TEST_F()
333 	/* Check that both guard pages result in SIGSEGV. */  in TEST_F()
337 	/* Remove the first guard page. */  in TEST_F()
343 	/* Remove the last guard page. */  in TEST_F()
352 	 *  these be faulted in, so this also tests that we can install guard  in TEST_F()
357 	/* Make sure they are all guard pages. */  in TEST_F()
371 	/* Remove guard pages. */  in TEST_F()
382 	 * Now remove all guard pages, make sure we don't remove existing  in TEST_F()
435 	 * Now mark the whole range as guard pages and make sure all VMAs are as  in TEST_F()
549 	/* We want guard markers at start/end of each VMA. */  in TEST_F()
579 	/* Now guard in one step. */  in TEST_F()
620 /* Assert that unmapping ranges does not leave guard markers behind. */
630 	/* Guard first and last pages. */  in TEST_F()
658 /* Assert that mprotect() operations have no bearing on guard markers. */
669 	/* Guard the middle of the range. */  in TEST_F()
684 	/* Make sure we can guard again without issue.*/  in TEST_F()
706 /* Split and merge VMAs and make sure guard pages still behave. */
717 	/* Guard the whole range. */  in TEST_F()
765 	/* Now make sure guard pages are established. */  in TEST_F()
774 	/* Now guard everything again. */  in TEST_F()
837 /* Assert that MADV_DONTNEED does not remove guard markers. */
855 	/* Guard every other page. */  in TEST_F()
866 	/* Check to ensure guard markers are still in place. */  in TEST_F()
898 /* Assert that mlock()'ed pages work correctly with guard markers. */
919 	/* Now try to guard, should fail with EINVAL. */  in TEST_F()
926 	/* Guard first half of range, should now succeed. */  in TEST_F()
929 	/* Make sure guard works. */  in TEST_F()
943 	 * Now lock the latter part of the range. We can't lock the guard pages,  in TEST_F()
950 	 * Now remove guard pages, we permit mlock()'d ranges to have guard  in TEST_F()
955 	/* Now check that no guard pages remain. */  in TEST_F()
968  * guard markers where possible.
982 	/* Place guard markers at both ends of the 5 page span. */  in TEST_F()
986 	/* Make sure the guard pages are in effect. */  in TEST_F()
999 	/* Make sure the guard markers are retained. */  in TEST_F()
1012  * guard markers where possible.
1014  * Expanding should retain guard pages, only now in different position. The user
1015  * will have to remove guard pages manually to fix up (they'd have to do the
1030 	/* Place guard markers at both ends of the 5 page span. */  in TEST_F()
1043 	 * Make sure the guard markers are retained in their original positions.  in TEST_F()
1058 	 * Again, make sure the guard markers are retained in their original positions.  in TEST_F()
1064 	 * A real user would have to remove guard markers, but would reasonably  in TEST_F()
1066 	 * guard markers.  in TEST_F()
1074  * guard markers where possible.
1091 	/* Place guard markers at both ends of the 5 page span. */  in TEST_F()
1103 	/* We expect the guard marker at the start to be retained... */  in TEST_F()
1106 	/* ...But remaining pages will not have guard markers. */  in TEST_F()
1114 	 * As with expansion, a real user would have to remove guard pages and  in TEST_F()
1126 	/* Again, we expect the guard marker at the start to be retained... */  in TEST_F()
1129 	/* ...But remaining pages will not have guard markers. */  in TEST_F()
1142  * retain guard pages.
1156 	/* Establish guard pages in the first 5 pages. */  in TEST_F()
1197  * and then guard and unguard the range.
1234 		/* Establish guard pages across the whole range. */  in TEST_F()
1240 		 * By removing the guard pages, the page tables will be  in TEST_F()
1291 	/* Guard the first 5 pages. */  in TEST_F()
1299 		/* Guard will have been wiped. */  in TEST_F()
1313 	/* Guard markers should be in effect.*/  in TEST_F()
1325 /* Ensure that MADV_FREE retains guard entries as expected. */
1340 	/* Guard range. */  in TEST_F()
1353 	/* This should leave the guard markers in place. */  in TEST_F()
1375 	/* Guard range. */  in TEST_F()
1390 /* Ensure that MADV_COLD, MADV_PAGEOUT do not remove guard markers. */
1402 	/* Guard range. */  in TEST_F()
1412 	/* Now mark cold. This should have no impact on guard markers. */  in TEST_F()
1436 /* Ensure that guard pages do not break userfaultd. */
1473 	/* Guard the range. This should not trigger the uffd. */  in TEST_F()
1491  * aggressively read-ahead, then install guard regions and assert that it
1494  * We page out using MADV_PAGEOUT before checking guard regions so we drop page
1517 	/* Mark every other page a guard page. */  in TEST_F()
1540 	/* Now remove guard pages. */  in TEST_F()
1551  * Check that file-backed mappings implement guard regions with MAP_PRIVATE
1573 	/* Install guard regions in every other page in the shared mapping. */  in TEST_F()
1587 	/* Install guard regions in every other page in the private mapping. */  in TEST_F()
1601 	/* Remove guard regions from shared mapping. */  in TEST_F()
1611 	/* Remove guard regions from private mapping. */  in TEST_F()
1654 		/* Ensure guard regions as expected. */  in TEST_F()
1660 	/* Remove the guard regions altogether. */  in TEST_F()
1670 	 * As we removed guard regions, the private pages from the first 5 will  in TEST_F()
1696 /* Test that guard regions established over a read-only mapping function correctly. */
1729 	/* Assert that the guard regions are in place.*/  in TEST_F()
1736 	/* Remove guard regions. */  in TEST_F()
1787 	/* Finally, ensure that guard regions are intact as expected. */  in TEST_F()
1833 	/* Here the guard regions will remain intact. */  in TEST_F()
1844 	/* Again, guard pages will remain intact. */  in TEST_F()
1869 	/* Install a guard region in the middle of the mapping. */  in TEST_F()
1879 	 * Where * is data and x is the guard region.  in TEST_F()
1893 	/* Ensure guard regions remain. */  in TEST_F()
1900 	/* Now remove guard region throughout. */  in TEST_F()
1914  * Ensure that a memfd works correctly with guard regions, that we can write
1915  * seal it then open the mapping read-only and still establish guard regions
1916  * within, remove those guard regions and have everything work correctly.
1966 	/* Now remove guard regions. */  in TEST_F()
1984  * Since we are now permitted to establish guard regions in read-only anonymous
1986  * use, test that guard regions function with a mapping to the anonymous zero
2016 	/* Now remove all guard regions. */  in TEST_F()
2033  * Assert that /proc/$pid/pagemap correctly identifies guard region ranges.
2049 	/* Read from pagemap, and assert no guard regions are detected. */  in TEST_F()
2058 	/* Install a guard region in every other page. */  in TEST_F()
2065 	/* Re-read from pagemap, and assert guard regions are detected. */  in TEST_F()