Michal Hocko eea274d64e selftests: vm: drop dependencies on page flags from mlock2 tests ... It was noticed that mlock2 tests are failing after 9c4e6b1a70 ("mm, mlock, vmscan: no more skipping pagevecs") because the patch has changed the timing on when the page is added to the unevictable LRU list and thus gains the unevictable page flag. The test was just too dependent on the implementation details which were true at the time when it was introduced. Page flags and the timing when they are set is something no userspace should ever depend on. The test should be testing only for the user observable contract of the tested syscalls. Those are defined pretty well for the mlock and there are other means for testing them. In fact this is already done and testing for page flags can be safely dropped to achieve the aimed purpose. Present bits can be checked by /proc/<pid>/smaps RSS field and the locking state by VmFlags although I would argue that Locked: field would be more appropriate. Drop all the page flag machinery and considerably simplify the test. This should be more robust for future kernel changes while checking the promised contract is still valid. Fixes: 9c4e6b1a70 ("mm, mlock, vmscan: no more skipping pagevecs") Reported-by: Rafael Aquini <aquini@redhat.com> Signed-off-by: Michal Hocko <mhocko@suse.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Acked-by: Rafael Aquini <aquini@redhat.com> Cc: Shakeel Butt <shakeelb@google.com> Cc: Eric B Munson <emunson@akamai.com> Cc: Shuah Khan <shuah@kernel.org> Cc: <stable@vger.kernel.org> Link: http://lkml.kernel.org/r/20200324154218.GS19542@dhcp22.suse.cz Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2020-04-02 09:35:31 -07:00
..
fault-injection	docs: fault-injection: convert docs to ReST and rename to *.rst	2019-06-14 14:21:07 -06:00
ktest	ktest: Fix typos in ktest.pl	2020-03-09 16:15:27 -04:00
kunit	kunit: run kunit_tool from any directory	2020-02-19 15:58:07 -07:00
nvdimm	remove ioremap_nocache and devm_ioremap_nocache	2020-01-06 09:45:59 +01:00
radix-tree	Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2019-07-08 15:45:14 -07:00
scatterlist	treewide: Add SPDX license identifier - Makefile/Kconfig	2019-05-21 10:50:46 +02:00
selftests	selftests: vm: drop dependencies on page flags from mlock2 tests	2020-04-02 09:35:31 -07:00
vsock	tools: testing: vsock: Test when server is bound but not listening	2020-02-16 19:01:49 -08:00