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Commit 3ce59bb8 authored by Brian Gerst's avatar Brian Gerst Committed by H. Peter Anvin
Browse files

x86: Sync asm/atomic_32.h and asm/atomic_64.h 



Prepare for merging into asm/atomic.h.

Signed-off-by: default avatarBrian Gerst <brgerst@gmail.com>
LKML-Reference: <1262883215-4034-3-git-send-email-brgerst@gmail.com>
Signed-off-by: default avatarH. Peter Anvin <hpa@zytor.com>
parent 1a3b1d89

arch/x86/include/asm/atomic_32.h

+36 −6
Original line number Diff line number Diff line
@@ -4,6 +4,7 @@ 
#include <linux/compiler.h>

#include <linux/types.h>

#include <asm/processor.h>

#include <asm/alternative.h>

#include <asm/cmpxchg.h>



/*
@@ -145,8 +146,8 @@ static inline int atomic_inc_and_test(atomic_t *v) 


/**

 * atomic_add_negative - add and test if negative

 * @v: pointer of type atomic_t

 * @i: integer value to add

 * @v: pointer of type atomic_t

 *

 * Atomically adds @i to @v and returns true

 * if the result is negative, or false when
@@ -164,8 +165,8 @@ static inline int atomic_add_negative(int i, atomic_t *v) 


/**

 * atomic_add_return - add integer and return

 * @v: pointer of type atomic_t

 * @i: integer value to add

 * @v: pointer of type atomic_t

 *

 * Atomically adds @i to @v and returns @i + @v

 */
@@ -206,6 +207,9 @@ static inline int atomic_sub_return(int i, atomic_t *v) 
	return atomic_add_return(-i, v);

}



#define atomic_inc_return(v)  (atomic_add_return(1, v))

#define atomic_dec_return(v)  (atomic_sub_return(1, v))



static inline int atomic_cmpxchg(atomic_t *v, int old, int new)

{

	return cmpxchg(&v->counter, old, new);
@@ -242,8 +246,33 @@ static inline int atomic_add_unless(atomic_t *v, int a, int u) 


#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)



#define atomic_inc_return(v)  (atomic_add_return(1, v))

#define atomic_dec_return(v)  (atomic_sub_return(1, v))

/**

 * atomic_inc_short - increment of a short integer

 * @v: pointer to type int

 *

 * Atomically adds 1 to @v

 * Returns the new value of @u

 */

static inline short int atomic_inc_short(short int *v)

{

	asm(LOCK_PREFIX "addw $1, %0" : "+m" (*v));

	return *v;

}



#ifdef CONFIG_X86_64

/**

 * atomic_or_long - OR of two long integers

 * @v1: pointer to type unsigned long

 * @v2: pointer to type unsigned long

 *

 * Atomically ORs @v1 and @v2

 * Returns the result of the OR

 */

static inline void atomic_or_long(unsigned long *v1, unsigned long v2)

{

	asm(LOCK_PREFIX "orq %1, %0" : "+m" (*v1) : "r" (v2));

}

#endif



/* These are x86-specific, used by some header files */

#define atomic_clear_mask(mask, addr)				\
@@ -252,7 +281,8 @@ static inline int atomic_add_unless(atomic_t *v, int a, int u) 


#define atomic_set_mask(mask, addr)				\

	asm volatile(LOCK_PREFIX "orl %0,%1"			\

		     : : "r" (mask), "m" (*(addr)) : "memory")

		     : : "r" ((unsigned)(mask)), "m" (*(addr))	\

		     : "memory")



/* Atomic operations are already serializing on x86 */

#define smp_mb__before_atomic_dec()	barrier()

arch/x86/include/asm/atomic_64.h

+53 −28
Original line number Diff line number Diff line 
#ifndef _ASM_X86_ATOMIC_64_H

#define _ASM_X86_ATOMIC_64_H



#include <linux/compiler.h>

#include <linux/types.h>

#include <asm/processor.h>

#include <asm/alternative.h>

#include <asm/cmpxchg.h>
@@ -45,12 +47,12 @@ static inline void atomic_set(atomic_t *v, int i) 
static inline void atomic_add(int i, atomic_t *v)

{

	asm volatile(LOCK_PREFIX "addl %1,%0"

		     : "=m" (v->counter)

		     : "ir" (i), "m" (v->counter));

		     : "+m" (v->counter)

		     : "ir" (i));

}



/**

 * atomic_sub - subtract the atomic variable

 * atomic_sub - subtract integer from atomic variable

 * @i: integer value to subtract

 * @v: pointer of type atomic_t

 *
@@ -59,8 +61,8 @@ static inline void atomic_add(int i, atomic_t *v) 
static inline void atomic_sub(int i, atomic_t *v)

{

	asm volatile(LOCK_PREFIX "subl %1,%0"

		     : "=m" (v->counter)

		     : "ir" (i), "m" (v->counter));

		     : "+m" (v->counter)

		     : "ir" (i));

}



/**
@@ -77,8 +79,8 @@ static inline int atomic_sub_and_test(int i, atomic_t *v) 
	unsigned char c;



	asm volatile(LOCK_PREFIX "subl %2,%0; sete %1"

		     : "=m" (v->counter), "=qm" (c)

		     : "ir" (i), "m" (v->counter) : "memory");

		     : "+m" (v->counter), "=qm" (c)

		     : "ir" (i) : "memory");

	return c;

}
@@ -91,8 +93,7 @@ static inline int atomic_sub_and_test(int i, atomic_t *v) 
static inline void atomic_inc(atomic_t *v)

{

	asm volatile(LOCK_PREFIX "incl %0"

		     : "=m" (v->counter)

		     : "m" (v->counter));

		     : "+m" (v->counter));

}



/**
@@ -104,8 +105,7 @@ static inline void atomic_inc(atomic_t *v) 
static inline void atomic_dec(atomic_t *v)

{

	asm volatile(LOCK_PREFIX "decl %0"

		     : "=m" (v->counter)

		     : "m" (v->counter));

		     : "+m" (v->counter));

}



/**
@@ -121,8 +121,8 @@ static inline int atomic_dec_and_test(atomic_t *v) 
	unsigned char c;



	asm volatile(LOCK_PREFIX "decl %0; sete %1"

		     : "=m" (v->counter), "=qm" (c)

		     : "m" (v->counter) : "memory");

		     : "+m" (v->counter), "=qm" (c)

		     : : "memory");

	return c != 0;

}
@@ -139,8 +139,8 @@ static inline int atomic_inc_and_test(atomic_t *v) 
	unsigned char c;



	asm volatile(LOCK_PREFIX "incl %0; sete %1"

		     : "=m" (v->counter), "=qm" (c)

		     : "m" (v->counter) : "memory");

		     : "+m" (v->counter), "=qm" (c)

		     : : "memory");

	return c != 0;

}
@@ -158,13 +158,13 @@ static inline int atomic_add_negative(int i, atomic_t *v) 
	unsigned char c;



	asm volatile(LOCK_PREFIX "addl %2,%0; sets %1"

		     : "=m" (v->counter), "=qm" (c)

		     : "ir" (i), "m" (v->counter) : "memory");

		     : "+m" (v->counter), "=qm" (c)

		     : "ir" (i) : "memory");

	return c;

}



/**

 * atomic_add_return - add and return

 * atomic_add_return - add integer and return

 * @i: integer value to add

 * @v: pointer of type atomic_t

 *
@@ -172,13 +172,36 @@ static inline int atomic_add_negative(int i, atomic_t *v) 
 */

static inline int atomic_add_return(int i, atomic_t *v)

{

	int __i = i;

	int __i;

#ifdef CONFIG_M386

	unsigned long flags;

	if (unlikely(boot_cpu_data.x86 <= 3))

		goto no_xadd;

#endif

	/* Modern 486+ processor */

	__i = i;

	asm volatile(LOCK_PREFIX "xaddl %0, %1"

		     : "+r" (i), "+m" (v->counter)

		     : : "memory");

	return i + __i;



#ifdef CONFIG_M386

no_xadd: /* Legacy 386 processor */

	local_irq_save(flags);

	__i = atomic_read(v);

	atomic_set(v, i + __i);

	local_irq_restore(flags);

	return i + __i;

#endif

}



/**

 * atomic_sub_return - subtract integer and return

 * @v: pointer of type atomic_t

 * @i: integer value to subtract

 *

 * Atomically subtracts @i from @v and returns @v - @i

 */

static inline int atomic_sub_return(int i, atomic_t *v)

{

	return atomic_add_return(-i, v);
@@ -187,23 +210,23 @@ static inline int atomic_sub_return(int i, atomic_t *v) 
#define atomic_inc_return(v)  (atomic_add_return(1, v))

#define atomic_dec_return(v)  (atomic_sub_return(1, v))



static inline long atomic_cmpxchg(atomic_t *v, int old, int new)

static inline int atomic_cmpxchg(atomic_t *v, int old, int new)

{

	return cmpxchg(&v->counter, old, new);

}



static inline long atomic_xchg(atomic_t *v, int new)

static inline int atomic_xchg(atomic_t *v, int new)

{

	return xchg(&v->counter, new);

}



/**

 * atomic_add_unless - add unless the number is a given value

 * atomic_add_unless - add unless the number is already a given value

 * @v: pointer of type atomic_t

 * @a: the amount to add to v...

 * @u: ...unless v is equal to u.

 *

 * Atomically adds @a to @v, so long as it was not @u.

 * Atomically adds @a to @v, so long as @v was not already @u.

 * Returns non-zero if @v was not @u, and zero otherwise.

 */

static inline int atomic_add_unless(atomic_t *v, int a, int u)
@@ -236,6 +259,7 @@ static inline short int atomic_inc_short(short int *v) 
	return *v;

}



#ifdef CONFIG_X86_64

/**

 * atomic_or_long - OR of two long integers

 * @v1: pointer to type unsigned long
@@ -248,6 +272,7 @@ static inline void atomic_or_long(unsigned long *v1, unsigned long v2) 
{

	asm(LOCK_PREFIX "orq %1, %0" : "+m" (*v1) : "r" (v2));

}

#endif



/* These are x86-specific, used by some header files */

#define atomic_clear_mask(mask, addr)				\