166 	/* Establish a guard page at the end of the mapping. */  in TEST_F()
170 	/* Check that both guard pages result in SIGSEGV. */  in TEST_F()
174 	/* Remove the first guard page. */  in TEST_F()
180 	/* Remove the last guard page. */  in TEST_F()
189 	 *  these be faulted in, so this also tests that we can install guard  in TEST_F()
194 	/* Make sure they are all guard pages. */  in TEST_F()
208 	/* Remove guard pages. */  in TEST_F()
219 	 * Now remove all guard pages, make sure we don't remove existing  in TEST_F()
274 	 * Now mark the whole range as guard pages and make sure all VMAs are as  in TEST_F()
395 	/* We want guard markers at start/end of each VMA. */  in TEST_F()
427 	/* Now guard in one step. */  in TEST_F()
469 /* Assert that unmapping ranges does not leave guard markers behind. */
479 	/* Guard first and last pages. */  in TEST_F()
507 /* Assert that mprotect() operations have no bearing on guard markers. */
518 	/* Guard the middle of the range. */  in TEST_F()
533 	/* Make sure we can guard again without issue.*/  in TEST_F()
555 /* Split and merge VMAs and make sure guard pages still behave. */
566 	/* Guard the whole range. */  in TEST_F()
614 	/* Now make sure guard pages are established. */  in TEST_F()
623 	/* Now guard everything again. */  in TEST_F()
686 /* Assert that MADV_DONTNEED does not remove guard markers. */
704 	/* Guard every other page. */  in TEST_F()
715 	/* Check to ensure guard markers are still in place. */  in TEST_F()
739 /* Assert that mlock()'ed pages work correctly with guard markers. */
760 	/* Now try to guard, should fail with EINVAL. */  in TEST_F()
767 	/* Guard first half of range, should now succeed. */  in TEST_F()
770 	/* Make sure guard works. */  in TEST_F()
784 	 * Now lock the latter part of the range. We can't lock the guard pages,  in TEST_F()
791 	 * Now remove guard pages, we permit mlock()'d ranges to have guard  in TEST_F()
796 	/* Now check that no guard pages remain. */  in TEST_F()
809  * guard markers where possible.
823 	/* Place guard markers at both ends of the 5 page span. */  in TEST_F()
827 	/* Make sure the guard pages are in effect. */  in TEST_F()
841 	/* Make sure the guard markers are retained. */  in TEST_F()
854  * guard markers where possible.
856  * Expanding should retain guard pages, only now in different position. The user
857  * will have to remove guard pages manually to fix up (they'd have to do the
872 	/* Place guard markers at both ends of the 5 page span. */  in TEST_F()
885 	 * Make sure the guard markers are retained in their original positions.  in TEST_F()
901 	 * Again, make sure the guard markers are retained in their original positions.  in TEST_F()
907 	 * A real user would have to remove guard markers, but would reasonably  in TEST_F()
909 	 * guard markers.  in TEST_F()
917  * guard markers where possible.
934 	/* Place guard markers at both ends of the 5 page span. */  in TEST_F()
946 	/* We expect the guard marker at the start to be retained... */  in TEST_F()
949 	/* ...But remaining pages will not have guard markers. */  in TEST_F()
957 	 * As with expansion, a real user would have to remove guard pages and  in TEST_F()
969 	/* Again, we expect the guard marker at the start to be retained... */  in TEST_F()
972 	/* ...But remaining pages will not have guard markers. */  in TEST_F()
985  * retain guard pages.
999 	/* Establish guard pages in the first 5 pages. */  in TEST_F()
1040  * and then guard and unguard the range.
1074 		/* Establish guard pages across the whole range. */  in TEST_F()
1080 		 * By removing the guard pages, the page tables will be  in TEST_F()
1128 	/* Guard the first 5 pages. */  in TEST_F()
1136 		/* Guard will have been wiped. */  in TEST_F()
1150 	/* Guard markers should be in effect.*/  in TEST_F()
1162 /* Ensure that MADV_FREE retains guard entries as expected. */
1174 	/* Guard range. */  in TEST_F()
1187 	/* This should leave the guard markers in place. */  in TEST_F()
1209 	/* Guard range. */  in TEST_F()
1224 /* Ensure that MADV_COLD, MADV_PAGEOUT do not remove guard markers. */
1236 	/* Guard range. */  in TEST_F()
1246 	/* Now mark cold. This should have no impact on guard markers. */  in TEST_F()
1270 /* Ensure that guard pages do not break userfaultd. */
1304 	/* Guard the range. This should not trigger the uffd. */  in TEST_F()