linux-kernel - [PATCH v2] selftests: memfd_secret: don't build memfd

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Message-Id: <20240812061522.1933054-1-usama.anjum@collabora.com>
Date: Mon, 12 Aug 2024 11:15:22 +0500
From: Muhammad Usama Anjum <usama.anjum@...labora.com>
To: Andrew Morton <akpm@...ux-foundation.org>,
	Shuah Khan <shuah@...nel.org>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Mike Rapoport <rppt@...nel.org>,
	James Bottomley <James.Bottomley@...senPartnership.com>
Cc: Muhammad Usama Anjum <usama.anjum@...labora.com>,
	kernel@...labora.com,
	stable@...r.kernel.org,
	Shuah Khan <skhan@...uxfoundation.org>,
	linux-mm@...ck.org,
	linux-kselftest@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-riscv@...ts.infradead.org
Subject: [PATCH v2] selftests: memfd_secret: don't build memfd_secret test on unsupported arches

[1] mentions that memfd_secret is only supported on arm64, riscv, x86
and x86_64 for now. It doesn't support other architectures. I found the
build error on arm and decided to send the fix as it was creating noise
on KernelCI:

memfd_secret.c: In function 'memfd_secret':
memfd_secret.c:42:24: error: '__NR_memfd_secret' undeclared (first use in this function);
did you mean 'memfd_secret'?
   42 |         return syscall(__NR_memfd_secret, flags);
      |                        ^~~~~~~~~~~~~~~~~
      |                        memfd_secret

Hence I'm adding condition that memfd_secret should only be compiled on
supported architectures.

Also check in run_vmtests script if memfd_secret binary is present
before executing it.

[1] https://lore.kernel.org/all/20210518072034.31572-7-rppt@kernel.org/
Cc: stable@...r.kernel.org
Fixes: 76fe17ef588a ("secretmem: test: add basic selftest for memfd_secret(2)")
Reviewed-by: Shuah Khan <skhan@...uxfoundation.org>
Acked-by: Mike Rapoport (Microsoft) <rppt@...nel.org>
Signed-off-by: Muhammad Usama Anjum <usama.anjum@...labora.com>
---
Changes since v1:
- Add error message to the patch and reviewed-by tags
---
 tools/testing/selftests/mm/Makefile       | 2 ++
 tools/testing/selftests/mm/run_vmtests.sh | 3 +++
 2 files changed, 5 insertions(+)

diff --git a/tools/testing/selftests/mm/Makefile b/tools/testing/selftests/mm/Makefile
index 1a83b70e84535..4ea188be0588a 100644
--- a/tools/testing/selftests/mm/Makefile
+++ b/tools/testing/selftests/mm/Makefile
@@ -53,7 +53,9 @@ TEST_GEN_FILES += madv_populate
 TEST_GEN_FILES += map_fixed_noreplace
 TEST_GEN_FILES += map_hugetlb
 TEST_GEN_FILES += map_populate
+ifneq (,$(filter $(ARCH),arm64 riscv riscv64 x86 x86_64))
 TEST_GEN_FILES += memfd_secret
+endif
 TEST_GEN_FILES += migration
 TEST_GEN_FILES += mkdirty
 TEST_GEN_FILES += mlock-random-test
diff --git a/tools/testing/selftests/mm/run_vmtests.sh b/tools/testing/selftests/mm/run_vmtests.sh
index 03ac4f2e1cce6..36045edb10dea 100755
--- a/tools/testing/selftests/mm/run_vmtests.sh
+++ b/tools/testing/selftests/mm/run_vmtests.sh
@@ -374,8 +374,11 @@ CATEGORY="hmm" run_test bash ./test_hmm.sh smoke
 # MADV_POPULATE_READ and MADV_POPULATE_WRITE tests
 CATEGORY="madv_populate" run_test ./madv_populate
 
+if [ -x ./memfd_secret ]
+then
 (echo 0 | sudo tee /proc/sys/kernel/yama/ptrace_scope 2>&1) | tap_prefix
 CATEGORY="memfd_secret" run_test ./memfd_secret
+fi
 
 # KSM KSM_MERGE_TIME_HUGE_PAGES test with size of 100
 CATEGORY="ksm" run_test ./ksm_tests -H -s 100
-- 
2.39.2