linux-kernel - [PATCH v3] selftests: lib: Skip tests on missing test modules

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Date:   Tue, 20 Jun 2017 10:18:18 +0530
From:   Sumit Semwal <sumit.semwal@...aro.org>
To:     shuah@...nel.org, linux-kselftest@...r.kernel.org
Cc:     keescook@...omium.org, decot@...glers.com,
        linux-kernel@...r.kernel.org,
        Sumit Semwal <sumit.semwal@...aro.org>
Subject: [PATCH v3] selftests: lib: Skip tests on missing test modules

With older kernels, printf.sh and bitmap.sh fail because they can't find
the respective test modules they are looking for.

Use modprobe dry run to check for missing test_XXX module. Error out with
the same error code as prime_numbers.sh.

v3: As pointed out by Kees, modules can be in-built too, so use 'modprobe
 -q -n' to check presence of the module, instead of 'find ..'.
v2: Per Shuah's review, search for the module rather than do modprobe.

Signed-off-by: Sumit Semwal <sumit.semwal@...aro.org>
---
 tools/testing/selftests/lib/bitmap.sh | 4 ++++
 tools/testing/selftests/lib/printf.sh | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/tools/testing/selftests/lib/bitmap.sh b/tools/testing/selftests/lib/bitmap.sh
index 2da187b6ddad..b073c22a3435 100755
--- a/tools/testing/selftests/lib/bitmap.sh
+++ b/tools/testing/selftests/lib/bitmap.sh
@@ -1,5 +1,9 @@
 #!/bin/sh
 # Runs bitmap infrastructure tests using test_bitmap kernel module
+if ! /sbin/modprobe -q -n test_bitmap; then
+	echo "bitmap: [SKIP]"
+	exit 77
+fi
 
 if /sbin/modprobe -q test_bitmap; then
 	/sbin/modprobe -q -r test_bitmap
diff --git a/tools/testing/selftests/lib/printf.sh b/tools/testing/selftests/lib/printf.sh
index 4fdc70fe6980..cbf3b124bd94 100755
--- a/tools/testing/selftests/lib/printf.sh
+++ b/tools/testing/selftests/lib/printf.sh
@@ -1,5 +1,9 @@
 #!/bin/sh
 # Runs printf infrastructure using test_printf kernel module
+if ! /sbin/modprobe -q -n test_printf; then
+	echo "printf: [SKIP]"
+	exit 77
+fi
 
 if /sbin/modprobe -q test_printf; then
 	/sbin/modprobe -q -r test_printf
-- 
2.7.4