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Date: Fri, 19 Feb 2010 18:26:43 +0100
From: Luca Barbieri <luca@...a-barbieri.com>
To: mingo@...e.hu
Cc: hpa@...or.com, a.p.zijlstra@...llo.nl, akpm@...ux-foundation.org,
linux-kernel@...r.kernel.org,
Luca Barbieri <luca@...a-barbieri.com>
Subject: [PATCH 4/5] lib: add self-test for atomic64_t
This patch adds self-test on boot code for atomic64_t.
This has been used to test the later changes in this patchset.
Signed-off-by: Luca Barbieri <luca@...a-barbieri.com>
---
lib/Kconfig.debug | 7 ++
lib/Makefile | 2 +
lib/atomic64_test.c | 158 +++++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 167 insertions(+), 0 deletions(-)
create mode 100644 lib/atomic64_test.c
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 25c3ed5..3676c51 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1054,6 +1054,13 @@ config DMA_API_DEBUG
This option causes a performance degredation. Use only if you want
to debug device drivers. If unsure, say N.
+config ATOMIC64_SELFTEST
+ bool "Perform an atomic64_t self-test at boot"
+ help
+ Enable this option to test the atomic64_t functions at boot.
+
+ If unsure, say N.
+
source "samples/Kconfig"
source "lib/Kconfig.kgdb"
diff --git a/lib/Makefile b/lib/Makefile
index 3b0b4a6..ab333e8 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -100,6 +100,8 @@ obj-$(CONFIG_GENERIC_CSUM) += checksum.o
obj-$(CONFIG_GENERIC_ATOMIC64) += atomic64.o
+obj-$(CONFIG_ATOMIC64_SELFTEST) += atomic64_test.o
+
hostprogs-y := gen_crc32table
clean-files := crc32table.h
diff --git a/lib/atomic64_test.c b/lib/atomic64_test.c
new file mode 100644
index 0000000..4ff649e
--- /dev/null
+++ b/lib/atomic64_test.c
@@ -0,0 +1,158 @@
+/*
+ * Testsuite for atomic64_t functions
+ *
+ * Copyright © 2010 Luca Barbieri
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+#include <linux/init.h>
+#include <asm/atomic.h>
+
+#define INIT(c) do { atomic64_set(&v, c); r = c; } while (0)
+static __init int test_atomic64(void)
+{
+ long long v0 = 0xaaa31337c001d00dLL;
+ long long v1 = 0xdeadbeefdeafcafeLL;
+ long long v2 = 0xfaceabadf00df001LL;
+ long long onestwos = 0x1111111122222222LL;
+ long long one = 1LL;
+
+ atomic64_t v = ATOMIC64_INIT(v0);
+ long long r = v0;
+ BUG_ON(v.counter != r);
+
+ atomic64_set(&v, v1);
+ r = v1;
+ BUG_ON(v.counter != r);
+ BUG_ON(atomic64_read(&v) != r);
+
+ INIT(v0);
+ atomic64_add(onestwos, &v);
+ r += onestwos;
+ BUG_ON(v.counter != r);
+
+ INIT(v0);
+ atomic64_add(-one, &v);
+ r += -one;
+ BUG_ON(v.counter != r);
+
+ INIT(v0);
+ r += onestwos;
+ BUG_ON(atomic64_add_return(onestwos, &v) != r);
+ BUG_ON(v.counter != r);
+
+ INIT(v0);
+ r += -one;
+ BUG_ON(atomic64_add_return(-one, &v) != r);
+ BUG_ON(v.counter != r);
+
+ INIT(v0);
+ atomic64_sub(onestwos, &v);
+ r -= onestwos;
+ BUG_ON(v.counter != r);
+
+ INIT(v0);
+ atomic64_sub(-one, &v);
+ r -= -one;
+ BUG_ON(v.counter != r);
+
+ INIT(v0);
+ r -= onestwos;
+ BUG_ON(atomic64_sub_return(onestwos, &v) != r);
+ BUG_ON(v.counter != r);
+
+ INIT(v0);
+ r -= -one;
+ BUG_ON(atomic64_sub_return(-one, &v) != r);
+ BUG_ON(v.counter != r);
+
+ INIT(v0);
+ atomic64_inc(&v);
+ r += one;
+ BUG_ON(v.counter != r);
+
+ INIT(v0);
+ r += one;
+ BUG_ON(atomic64_inc_return(&v) != r);
+ BUG_ON(v.counter != r);
+
+ INIT(v0);
+ atomic64_dec(&v);
+ r -= one;
+ BUG_ON(v.counter != r);
+
+ INIT(v0);
+ r -= one;
+ BUG_ON(atomic64_dec_return(&v) != r);
+ BUG_ON(v.counter != r);
+
+ INIT(v0);
+ BUG_ON(atomic64_xchg(&v, v1) != v0);
+ r = v1;
+ BUG_ON(v.counter != r);
+
+ INIT(v0);
+ BUG_ON(atomic64_cmpxchg(&v, v0, v1) != v0);
+ r = v1;
+ BUG_ON(v.counter != r);
+
+ INIT(v0);
+ BUG_ON(atomic64_cmpxchg(&v, v2, v1) != v0);
+ BUG_ON(v.counter != r);
+
+ INIT(v0);
+ BUG_ON(!atomic64_add_unless(&v, one, v0));
+ BUG_ON(v.counter != r);
+
+ INIT(v0);
+ BUG_ON(atomic64_add_unless(&v, one, v1));
+ r += one;
+ BUG_ON(v.counter != r);
+
+ INIT(onestwos);
+ BUG_ON(atomic64_dec_if_positive(&v) != (onestwos - 1));
+ r -= one;
+ BUG_ON(v.counter != r);
+
+ INIT(0);
+ BUG_ON(atomic64_dec_if_positive(&v) != -one);
+ BUG_ON(v.counter != r);
+
+ INIT(-one);
+ BUG_ON(atomic64_dec_if_positive(&v) != (-one - one));
+ BUG_ON(v.counter != r);
+
+ INIT(onestwos);
+ BUG_ON(atomic64_inc_not_zero(&v));
+ r += one;
+ BUG_ON(v.counter != r);
+
+ INIT(0);
+ BUG_ON(!atomic64_inc_not_zero(&v));
+ BUG_ON(v.counter != r);
+
+ INIT(-one);
+ BUG_ON(atomic64_inc_not_zero(&v));
+ r += one;
+ BUG_ON(v.counter != r);
+
+#ifdef CONFIG_X86
+ printk(KERN_INFO "atomic64 test passed for %s+ platform %s CX8 and %s SSE\n",
+#ifdef CONFIG_X86_CMPXCHG64
+ "586",
+#else
+ "386",
+#endif
+ boot_cpu_has(X86_FEATURE_CX8) ? "with" : "without",
+ boot_cpu_has(X86_FEATURE_XMM) ? "with" : "without");
+#else
+ printk(KERN_INFO "atomic64 test passed\n");
+#endif
+
+ return 0;
+}
+
+core_initcall(test_atomic64);
--
1.6.6.1.476.g01ddb
--
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