linux-kernel - [PATCH v1 2/3] selftests/mm: allocate 6 hugepages in va_high_addr

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Message-ID: <20251207122239.3228920-2-chuhu@redhat.com>
Date: Sun,  7 Dec 2025 20:22:38 +0800
From: Chunyu Hu <chuhu@...hat.com>
To: akpm@...ux-foundation.org,
	david@...nel.org,
	shuah@...nel.org,
	linux-mm@...ck.org
Cc: linux-kselftest@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	lorenzo.stoakes@...cle.com,
	Liam.Howlett@...cle.com,
	vbabka@...e.cz,
	rppt@...nel.org,
	surenb@...gle.com,
	mhocko@...e.com,
	chuhu@...hat.com,
	Luiz Capitulino <luizcap@...hat.com>
Subject: [PATCH v1 2/3] selftests/mm: allocate 6 hugepages in va_high_addr_switch.sh

The va_high_addr_switch test requires 6 hugepages, not 5. If running the
test directly by: ./va_high_addr_switch.sh, the test will hit a mmap 'FAIL'
caused by not enough hugepages:
  ```
  mmap(addr_switch_hint - hugepagesize, 2*hugepagesize, MAP_HUGETLB): 0x7f330f800000 - OK
  mmap(addr_switch_hint , 2*hugepagesize, MAP_FIXED | MAP_HUGETLB): 0xffffffffffffffff - FAILED
  ```
The failure can't be hit if run the tests by running 'run_vmtests.sh -t
hugevm' because the nr_hugepages is set to 128 at the beginning of
run_vmtests.sh and va_high_addr_switch.sh skip the setup of nr_hugepages
because already enough.

CC: Luiz Capitulino <luizcap@...hat.com>
Fixes: d9d957bd7b61 ("selftests/mm: alloc hugepages in va_high_addr_switch test")
Signed-off-by: Chunyu Hu <chuhu@...hat.com>
---
 tools/testing/selftests/mm/va_high_addr_switch.sh | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/mm/va_high_addr_switch.sh b/tools/testing/selftests/mm/va_high_addr_switch.sh
index f89fe078a8e6..98f3dfab62c5 100755
--- a/tools/testing/selftests/mm/va_high_addr_switch.sh
+++ b/tools/testing/selftests/mm/va_high_addr_switch.sh
@@ -111,8 +111,10 @@ setup_nr_hugepages()
 
 check_test_requirements
 save_nr_hugepages
-# 4 keep_mapped pages, and one for tmp usage
-setup_nr_hugepages 5
+# 5 keep_mapped hugepages are reserved in the first testings, and the last test
+# requires two hugepages, with one verlaped with the last second test, so one
+# extra, totally 6 hugepages
+setup_nr_hugepages 6
 ./va_high_addr_switch --run-hugetlb
 retcode=$?
 restore_nr_hugepages
-- 
2.49.0