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Commit 41b9e9fc authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Thomas Gleixner
Browse files

atomic: Add simple atomic_t tests 



Add a few atomic_t tests, gets some compile coverage for the new
operations.

Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 805de8f4

lib/atomic64_test.c

+47 −21
Original line number Diff line number Diff line
@@ -16,8 +16,39 @@ 
#include <linux/kernel.h>

#include <linux/atomic.h>



#define TEST(bit, op, c_op, val)				\

do {								\

	atomic##bit##_set(&v, v0);				\

	r = v0;							\

	atomic##bit##_##op(val, &v);				\

	r c_op val;						\

	WARN(atomic##bit##_read(&v) != r, "%Lx != %Lx\n",	\

		(unsigned long long)atomic##bit##_read(&v),	\

		(unsigned long long)r);				\

} while (0)



static __init void test_atomic(void)

{

	int v0 = 0xaaa31337;

	int v1 = 0xdeadbeef;

	int onestwos = 0x11112222;

	int one = 1;



	atomic_t v;

	int r;



	TEST(, add, +=, onestwos);

	TEST(, add, +=, -one);

	TEST(, sub, -=, onestwos);

	TEST(, sub, -=, -one);

	TEST(, or, |=, v1);

	TEST(, and, &=, v1);

	TEST(, xor, ^=, v1);

	TEST(, andnot, &= ~, v1);

}



#define INIT(c) do { atomic64_set(&v, c); r = c; } while (0)

static __init int test_atomic64(void)

static __init void test_atomic64(void)

{

	long long v0 = 0xaaa31337c001d00dLL;

	long long v1 = 0xdeadbeefdeafcafeLL;
@@ -34,15 +65,14 @@ static __init int test_atomic64(void) 
	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);

	TEST(64, add, +=, onestwos);

	TEST(64, add, +=, -one);

	TEST(64, sub, -=, onestwos);

	TEST(64, sub, -=, -one);

	TEST(64, or, |=, v1);

	TEST(64, and, &=, v1);

	TEST(64, xor, ^=, v1);

	TEST(64, andnot, &= ~, v1);



	INIT(v0);

	r += onestwos;
@@ -54,16 +84,6 @@ static __init int test_atomic64(void) 
	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);
@@ -147,6 +167,12 @@ static __init int test_atomic64(void) 
	BUG_ON(!atomic64_inc_not_zero(&v));

	r += one;

	BUG_ON(v.counter != r);

}



static __init int test_atomics(void)

{

	test_atomic();

	test_atomic64();



#ifdef CONFIG_X86

	pr_info("passed for %s platform %s CX8 and %s SSE\n",
@@ -166,4 +192,4 @@ static __init int test_atomic64(void) 
	return 0;

}



core_initcall(test_atomic64);
 
core_initcall(test_atomics);