Ryan Roberts a32bf5bb79 selftests/mm: set allocated memory to non-zero content in cow test ... After commit b1f202060a ("mm: remap unused subpages to shared zeropage when splitting isolated thp"), cow test cases involving swapping out THPs via madvise(MADV_PAGEOUT) started to be skipped due to the subsequent check via pagemap determining that the memory was not actually swapped out. Logs similar to this were emitted: ... # [RUN] Basic COW after fork() ... with swapped-out, PTE-mapped THP (16 kB) ok 2 # SKIP MADV_PAGEOUT did not work, is swap enabled? # [RUN] Basic COW after fork() ... with single PTE of swapped-out THP (16 kB) ok 3 # SKIP MADV_PAGEOUT did not work, is swap enabled? # [RUN] Basic COW after fork() ... with swapped-out, PTE-mapped THP (32 kB) ok 4 # SKIP MADV_PAGEOUT did not work, is swap enabled? ... The commit in question introduces the behaviour of scanning THPs and if their content is predominantly zero, it splits them and replaces the pages which are wholly zero with the zero page. These cow test cases were getting caught up in this. So let's avoid that by filling the contents of all allocated memory with a non-zero value. With this in place, the tests are passing again. Link: https://lkml.kernel.org/r/20250107142555.1870101-1-ryan.roberts@arm.com Fixes: b1f202060a ("mm: remap unused subpages to shared zeropage when splitting isolated thp") Signed-off-by: Ryan Roberts <ryan.roberts@arm.com> Acked-by: David Hildenbrand <david@redhat.com> Cc: Usama Arif <usamaarif642@gmail.com> Cc: Yu Zhao <yuzhao@google.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>		2025-01-12 19:03:37 -08:00
..
crypto/chacha20-s390
cxl	module: Convert symbol namespace to string literal	2024-12-02 11:34:44 -08:00
fault-injection	failcmd: make failcmd.sh executable	2024-09-01 20:43:32 -07:00
ktest	ktest.pl: Avoid false positives with grub2 skip regex	2024-09-04 15:06:28 -04:00
kunit	kunit: qemu_configs: loongarch: Enable shutdown	2024-11-19 15:26:30 -07:00
memblock	memblock: updates for 6.12-rc1	2024-09-25 11:35:19 -07:00
nvdimm	Get rid of 'remove_new' relic from platform driver struct	2024-12-01 15:12:43 -08:00
radix-tree	maple_tree: add some alloc node test case	2024-11-06 20:11:13 -08:00
scatterlist
selftests	selftests/mm: set allocated memory to non-zero content in cow test	2025-01-12 19:03:37 -08:00
shared	tools: fix atomic_set() definition to set the value correctly	2025-01-12 19:03:35 -08:00
vma	tools: fix atomic_set() definition to set the value correctly	2025-01-12 19:03:35 -08:00
vsock	vsock/test: verify socket options after setting them	2024-12-05 11:39:34 +01:00