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@luca-barbieri.com>
LKML-Reference: <1267005265-27958-4-git-send-email-luca@luca-barbieri.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 25c3ed5..3676c51 100644 (file)
--- 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 347ad8d..4af4786 100644 (file)
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -99,6 +99,8 @@ 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 (file)
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);