Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / lib / atomic64_test.c

diff --git a/kernel/lib/atomic64_test.c b/kernel/lib/atomic64_test.c
new file mode 100644 (file)
index 0000000..0211d30
--- /dev/null
+++ b/kernel/lib/atomic64_test.c
@@ -0,0 +1,169 @@
+/*
+ * 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.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/init.h>
+#include <linux/bug.h>
+#include <linux/kernel.h>
+#include <linux/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);
+
+#ifdef CONFIG_ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
+       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);
+#else
+#warning Please implement atomic64_dec_if_positive for your architecture and select the above Kconfig symbol
+#endif
+
+       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
+       pr_info("passed for %s platform %s CX8 and %s SSE\n",
+#ifdef CONFIG_X86_64
+               "x86-64",
+#elif defined(CONFIG_X86_CMPXCHG64)
+               "i586+",
+#else
+               "i386+",
+#endif
+              boot_cpu_has(X86_FEATURE_CX8) ? "with" : "without",
+              boot_cpu_has(X86_FEATURE_XMM) ? "with" : "without");
+#else
+       pr_info("passed\n");
+#endif
+
+       return 0;
+}
+
+core_initcall(test_atomic64);