linux-kernel - [PATCH] fixup! selftests/mm: run_vmtests.sh: fix hugetlb mem size calculation

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Date: Wed,  3 Apr 2024 16:03:24 -0400
From: peterx@...hat.com
To: linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Cc: Andrew Morton <akpm@...ux-foundation.org>,
	peterx@...hat.com,
	Muhammad Usama Anjum <usama.anjum@...labora.com>,
	David Hildenbrand <david@...hat.com>,
	Muchun Song <muchun.song@...ux.dev>,
	Ryan Roberts <ryan.roberts@....com>
Subject: [PATCH] fixup! selftests/mm: run_vmtests.sh: fix hugetlb mem size calculation

From: Peter Xu <peterx@...hat.com>

Fix up a breakage on uffd hugetlb test due to removal of a temp variable,
as reported by Ryan [1].

Instead of using the previous calculation, use the largest we can
have (which is put in freepgs) and cut it into half for userfault tests.

[1] https://lore.kernel.org/r/1c20b717-c5b5-4bdf-8fcd-d46db135b7fa@arm.com

Cc: Muhammad Usama Anjum <usama.anjum@...labora.com>
Cc: David Hildenbrand <david@...hat.com>
Cc: Muchun Song <muchun.song@...ux.dev>
Reported-by: Ryan Roberts <ryan.roberts@....com>
Signed-off-by: Peter Xu <peterx@...hat.com>
---
 tools/testing/selftests/mm/run_vmtests.sh | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/mm/run_vmtests.sh b/tools/testing/selftests/mm/run_vmtests.sh
index b1b78e45d613..223c2304f885 100755
--- a/tools/testing/selftests/mm/run_vmtests.sh
+++ b/tools/testing/selftests/mm/run_vmtests.sh
@@ -298,7 +298,8 @@ CATEGORY="userfaultfd" run_test ./uffd-unit-tests
 uffd_stress_bin=./uffd-stress
 CATEGORY="userfaultfd" run_test ${uffd_stress_bin} anon 20 16
 # Hugetlb tests require source and destination huge pages. Pass in half
-# the size ($half_ufd_size_MB), which is used for *each*.
+# the size of the free pages we have, which is used for *each*.
+half_ufd_size_MB=$((freepgs / 2))
 CATEGORY="userfaultfd" run_test ${uffd_stress_bin} hugetlb "$half_ufd_size_MB" 32
 CATEGORY="userfaultfd" run_test ${uffd_stress_bin} hugetlb-private "$half_ufd_size_MB" 32
 CATEGORY="userfaultfd" run_test ${uffd_stress_bin} shmem 20 16
-- 
2.44.0