The patch titled
Subject: selftests/mm: skip map_populate on weird filesystems
has been added to the -mm mm-unstable branch. Its filename is
selftests-mm-skip-map_populate-on-weird-filesystems.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/selftests-mm-skip-map_populate-on-weird-filesystems.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Brendan Jackman <jackmanb@xxxxxxxxxx>
Subject: selftests/mm: skip map_populate on weird filesystems
Date: Fri, 21 Feb 2025 18:25:47 +0000
It seems that 9pfs does not allow truncating unlinked files, Mark Brown
has noted that NFS may also behave this way.
It doesn't seem quite right to call this a "bug" but it's probably a
special enough case that it makes sense for the test to just SKIP if it
happens.
Link: https://lkml.kernel.org/r/20250221-mm-selftests-v2-8-28c4d66383c5@xxxxxxxxxx
Signed-off-by: Brendan Jackman <jackmanb@xxxxxxxxxx>
Cc: Dev Jain <dev.jain@xxxxxxx>
Cc: Lorenzo Stoakes <lorenzo.stoakes@xxxxxxxxxx>
Cc: Mateusz Guzik <mjguzik@xxxxxxxxx>
Cc: Shuah Khan (Samsung OSG) <shuah@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
tools/testing/selftests/mm/map_populate.c | 7 +++++++
1 file changed, 7 insertions(+)
--- a/tools/testing/selftests/mm/map_populate.c~selftests-mm-skip-map_populate-on-weird-filesystems
+++ a/tools/testing/selftests/mm/map_populate.c
@@ -87,6 +87,13 @@ int main(int argc, char **argv)
BUG_ON(!ftmp, "tmpfile()");
ret = ftruncate(fileno(ftmp), MMAP_SZ);
+ if (ret < 0 && errno == ENOENT) {
+ /*
+ * This probably means tmpfile() made a file on a filesystem
+ * that doesn't handle temporary files the way we want.
+ */
+ ksft_exit_skip("ftruncate(fileno(tmpfile())) gave ENOENT, weird filesystem?");
+ }
BUG_ON(ret, "ftruncate()");
smap = mmap(0, MMAP_SZ, PROT_READ | PROT_WRITE,
_
Patches currently in -mm which might be from jackmanb@xxxxxxxxxx are
mm-mmu_gather-update-comment-on-rcu-freeing.patch
selftests-mm-report-errno-when-things-fail-in-gup_longterm.patch
selftests-mm-fix-assumption-that-sudo-is-present.patch
selftests-mm-skip-uffd-stress-if-userfaultfd-not-available.patch
selftests-mm-skip-uffd-wp-mremap-if-userfaultfd-not-available.patch
selftests-mm-uffd-rename-nr_cpus-nr_threads.patch
selftests-mm-print-some-details-when-uffd-stress-gets-bad-params.patch
selftests-mm-dont-fail-uffd-stress-if-too-many-cpus.patch
selftests-mm-skip-map_populate-on-weird-filesystems.patch
selftests-mm-skip-gup_longerm-tests-on-weird-filesystems.patch
