+ selftest-mm-skip-if-fallocate-is-unsupported-in-gup_longterm.patch added to mm-new branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: selftest/mm: skip if fallocate() is unsupported in gup_longterm
has been added to the -mm mm-new branch.  Its filename is
     selftest-mm-skip-if-fallocate-is-unsupported-in-gup_longterm.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/selftest-mm-skip-if-fallocate-is-unsupported-in-gup_longterm.patch

This patch will later appear in the mm-new branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Note, mm-new is a provisional staging ground for work-in-progress
patches, and acceptance into mm-new is a notification for others take
notice and to finish up reviews.  Please do not hesitate to respond to
review feedback and post updated versions to replace or incrementally
fixup patches in mm-new.

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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

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------------------------------------------------------
From: Mark Brown <broonie@kernel.org>
Subject: selftest/mm: skip if fallocate() is unsupported in gup_longterm
Date: Fri, 13 Jun 2025 12:44:07 +0100

Currently gup_longterm assumes that filesystems support fallocate() and
uses that to allocate space in files, however this is an optional feature
and is in particular not implemented by NFSv3 which is commonly used in CI
systems leading to spurious failures.  Check for lack of support and
report a skip instead for that case.

Link: https://lkml.kernel.org/r/20250613-selftest-mm-gup-longterm-fallocate-nfs-v1-1-758a104c175f@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: David Hildenbrand <david@redhat.com>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 tools/testing/selftests/mm/gup_longterm.c |   10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

--- a/tools/testing/selftests/mm/gup_longterm.c~selftest-mm-skip-if-fallocate-is-unsupported-in-gup_longterm
+++ a/tools/testing/selftests/mm/gup_longterm.c
@@ -114,7 +114,15 @@ static void do_test(int fd, size_t size,
 	}
 
 	if (fallocate(fd, 0, 0, size)) {
-		if (size == pagesize) {
+		/*
+		 * Some filesystems (eg, NFSv3) don't support
+		 * fallocate(), report this as a skip rather than a
+		 * test failure.
+		 */
+		if (errno == EOPNOTSUPP) {
+			ksft_print_msg("fallocate() not supported by filesystem\n");
+			result = KSFT_SKIP;
+		} else if (size == pagesize) {
 			ksft_print_msg("fallocate() failed (%s)\n", strerror(errno));
 			result = KSFT_FAIL;
 		} else {
_

Patches currently in -mm which might be from broonie@kernel.org are

kselftest-mm-clarify-errors-for-pipe.patch
selftests-mm-convert-some-cow-error-reports-to-ksft_perror.patch
selftests-mm-dont-compare-return-values-to-in-cow.patch
selftests-mm-add-messages-about-test-errors-to-the-cow-tests.patch
selftests-mm-check-for-yama-ptrace_scope-configuraiton-before-modifying-it.patch
selftest-mm-skip-if-fallocate-is-unsupported-in-gup_longterm.patch