linux-kernel - [PATCH 3/3] lib: Add module support to atomic64 tests

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Date:   Tue,  3 Jan 2017 20:04:36 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Matt Domsch <Matt_Domsch@...l.com>,
        Luca Barbieri <luca@...a-barbieri.com>,
        George Spelvin <linux@...izon.com>,
        linux-kernel@...r.kernel.org,
        Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: [PATCH 3/3] lib: Add module support to atomic64 tests

Allow to compile the atomic64 test code either to a loadable module, or
builtin into the kernel.

Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
---
 lib/Kconfig.debug   |  5 +++--
 lib/atomic64_test.c | 10 ++++++++--
 2 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index b06848a104e6940e..42e210544b27fca7 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1765,9 +1765,10 @@ config PERCPU_TEST
 	  If unsure, say N.
 
 config ATOMIC64_SELFTEST
-	bool "Perform an atomic64_t self-test at boot"
+	tristate "Perform an atomic64_t self-test"
 	help
-	  Enable this option to test the atomic64_t functions at boot.
+	  Enable this option to test the atomic64_t functions at boot or
+	  at module load time.
 
 	  If unsure, say N.
 
diff --git a/lib/atomic64_test.c b/lib/atomic64_test.c
index 46042901130f107b..fd70c0e0e6731499 100644
--- a/lib/atomic64_test.c
+++ b/lib/atomic64_test.c
@@ -15,6 +15,7 @@
 #include <linux/bug.h>
 #include <linux/kernel.h>
 #include <linux/atomic.h>
+#include <linux/module.h>
 
 #ifdef CONFIG_X86
 #include <asm/cpufeature.h>	/* for boot_cpu_has below */
@@ -241,7 +242,7 @@ static __init void test_atomic64(void)
 	BUG_ON(v.counter != r);
 }
 
-static __init int test_atomics(void)
+static __init int test_atomics_init(void)
 {
 	test_atomic();
 	test_atomic64();
@@ -264,4 +265,9 @@ static __init int test_atomics(void)
 	return 0;
 }
 
-core_initcall(test_atomics);
+static __exit void test_atomics_exit(void) {}
+
+module_init(test_atomics_init);
+module_exit(test_atomics_exit);
+
+MODULE_LICENSE("GPL");
-- 
1.9.1