linux-kernel - [PATCH v2 0/4] selftests/mm: cow and gup

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Message-Id: <20250527-selftests-mm-cow-dedupe-v2-0-ff198df8e38e@kernel.org>
Date: Tue, 27 May 2025 17:04:44 +0100
From: Mark Brown <broonie@...nel.org>
To: Andrew Morton <akpm@...ux-foundation.org>, 
 Shuah Khan <shuah@...nel.org>, David Hildenbrand <david@...hat.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>, linux-mm@...ck.org, 
 linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Mark Brown <broonie@...nel.org>
Subject: [PATCH v2 0/4] selftests/mm: cow and gup_longterm cleanups

The bulk of these changes modify the cow and gup_longterm tests to
report unique and stable names for each test, bringing them into line
with the expectations of tooling that works with kselftest.  The string
reported as a test result is used by tooling to both deduplicate tests
and track tests between test runs, using the same string for multiple
tests or changing the string depending on test result causes problems
for user interfaces and automation such as bisection.

It was suggested that converting to use kselftest_harness.h would be a
good way of addressing this, however that really wants the set of tests
to run to be known at compile time but both test programs dynamically
enumarate the set of huge page sizes the system supports and test each.
Refactoring to handle this would be even more invasive than these
changes which are large but straightforward and repetitive.

A version of the main gup_longterm cleanup was previously sent
separately, this version factors out the helpers for logging the start
of the test since the cow test looks very similar.

Signed-off-by: Mark Brown <broonie@...nel.org>
---
Changes in v2:
- Typo fixes.
- Link to v1: https://lore.kernel.org/r/20250522-selftests-mm-cow-dedupe-v1-0-713cee2fdd6d@kernel.org

---
Mark Brown (4):
      selftests/mm: Use standard ksft_finished() in cow and gup_longterm
      selftests/mm: Add helper for logging test start and results
      selftests/mm: Report unique test names for each cow test
      selftests/mm: Fix test result reporting in gup_longterm

 tools/testing/selftests/mm/cow.c          | 340 +++++++++++++++++++-----------
 tools/testing/selftests/mm/gup_longterm.c | 158 ++++++++------
 tools/testing/selftests/mm/vm_util.h      |  20 ++
 3 files changed, 334 insertions(+), 184 deletions(-)
---
base-commit: a5806cd506af5a7c19bcd596e4708b5c464bfd21
change-id: 20250521-selftests-mm-cow-dedupe-33dcab034558

Best regards,
-- 
Mark Brown <broonie@...nel.org>