Eric Lee / smarc-fsl-linux-kernel

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lib/atomic64_test.c 3.48 KB
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  /*
   * 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>
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  #include <linux/kernel.h>
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  #include <linux/atomic.h>
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  #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);
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  	BUG_ON(atomic64_add_unless(&v, one, v0));
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  	BUG_ON(v.counter != r);
  
  	INIT(v0);
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  	BUG_ON(!atomic64_add_unless(&v, one, v1));
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  	r += one;
  	BUG_ON(v.counter != r);
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  #if defined(CONFIG_X86) || defined(CONFIG_MIPS) || defined(CONFIG_PPC) || \
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      defined(CONFIG_S390) || defined(_ASM_GENERIC_ATOMIC64_H) || defined(CONFIG_ARM)
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  	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);
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  #else
  #warning Please implement atomic64_dec_if_positive for your architecture, and add it to the IF above
  #endif
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  	INIT(onestwos);
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  	BUG_ON(!atomic64_inc_not_zero(&v));
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  	r += one;
  	BUG_ON(v.counter != r);
  
  	INIT(0);
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  	BUG_ON(atomic64_inc_not_zero(&v));
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  	BUG_ON(v.counter != r);
  
  	INIT(-one);
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  	BUG_ON(!atomic64_inc_not_zero(&v));
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  	r += one;
  	BUG_ON(v.counter != r);
  
  #ifdef CONFIG_X86
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  	printk(KERN_INFO "atomic64 test passed for %s platform %s CX8 and %s SSE
  ",
  #ifdef CONFIG_X86_64
  	       "x86-64",
  #elif defined(CONFIG_X86_CMPXCHG64)
  	       "i586+",
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  #else
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  	       "i386+",
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  #endif
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  	       boot_cpu_has(X86_FEATURE_CX8) ? "with" : "without",
  	       boot_cpu_has(X86_FEATURE_XMM) ? "with" : "without");
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  #else
  	printk(KERN_INFO "atomic64 test passed
  ");
  #endif
  
  	return 0;
  }
  
  core_initcall(test_atomic64);