Commit 9e5228ce authored by Paul Gortmaker's avatar Paul Gortmaker Committed by Linus Torvalds
Browse files

parisc: fix missing cmpxchg file error from system.h split 



Commit b4816afa ("Move the asm-generic/system.h xchg()
implementation to asm-generic/cmpxchg.h") introduced the concept of
asm/cmpxchg.h but the parisc arch never got one.  Fork the cmpxchg
content out of the asm/atomic.h file to create one.

Some minor whitespace fixups were done on the block of code that created
the new file.

Cc: "James E.J. Bottomley" <jejb@parisc-linux.org>
Cc: Helge Deller <deller@gmx.de>
Signed-off-by: default avatarPaul Gortmaker <paul.gortmaker@windriver.com>
Acked-by: default avatarDavid Howells <dhowells@redhat.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 1512cdc3

arch/parisc/include/asm/atomic.h

+1 −106
Original line number Diff line number Diff line
@@ -6,6 +6,7 @@ 
#define _ASM_PARISC_ATOMIC_H_



#include <linux/types.h>

#include <asm/cmpxchg.h>



/*

 * Atomic operations that C can't guarantee us.  Useful for
@@ -48,112 +49,6 @@ extern arch_spinlock_t __atomic_hash[ATOMIC_HASH_SIZE] __lock_aligned; 
#  define _atomic_spin_unlock_irqrestore(l,f) do { local_irq_restore(f); } while (0)

#endif



/* This should get optimized out since it's never called.

** Or get a link error if xchg is used "wrong".

*/

extern void __xchg_called_with_bad_pointer(void);





/* __xchg32/64 defined in arch/parisc/lib/bitops.c */

extern unsigned long __xchg8(char, char *);

extern unsigned long __xchg32(int, int *);

#ifdef CONFIG_64BIT

extern unsigned long __xchg64(unsigned long, unsigned long *);

#endif



/* optimizer better get rid of switch since size is a constant */

static __inline__ unsigned long

__xchg(unsigned long x, __volatile__ void * ptr, int size)

{

	switch(size) {

#ifdef CONFIG_64BIT

	case 8: return __xchg64(x,(unsigned long *) ptr);

#endif

	case 4: return __xchg32((int) x, (int *) ptr);

	case 1: return __xchg8((char) x, (char *) ptr);

	}

	__xchg_called_with_bad_pointer();

	return x;

}





/*

** REVISIT - Abandoned use of LDCW in xchg() for now:

** o need to test sizeof(*ptr) to avoid clearing adjacent bytes

** o and while we are at it, could CONFIG_64BIT code use LDCD too?

**

**	if (__builtin_constant_p(x) && (x == NULL))

**		if (((unsigned long)p & 0xf) == 0)

**			return __ldcw(p);

*/

#define xchg(ptr,x) \

	((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))





#define __HAVE_ARCH_CMPXCHG	1



/* bug catcher for when unsupported size is used - won't link */

extern void __cmpxchg_called_with_bad_pointer(void);



/* __cmpxchg_u32/u64 defined in arch/parisc/lib/bitops.c */

extern unsigned long __cmpxchg_u32(volatile unsigned int *m, unsigned int old, unsigned int new_);

extern unsigned long __cmpxchg_u64(volatile unsigned long *ptr, unsigned long old, unsigned long new_);



/* don't worry...optimizer will get rid of most of this */

static __inline__ unsigned long

__cmpxchg(volatile void *ptr, unsigned long old, unsigned long new_, int size)

{

	switch(size) {

#ifdef CONFIG_64BIT

	case 8: return __cmpxchg_u64((unsigned long *)ptr, old, new_);

#endif

	case 4: return __cmpxchg_u32((unsigned int *)ptr, (unsigned int) old, (unsigned int) new_);

	}

	__cmpxchg_called_with_bad_pointer();

	return old;

}



#define cmpxchg(ptr,o,n)						 \

  ({									 \

     __typeof__(*(ptr)) _o_ = (o);					 \

     __typeof__(*(ptr)) _n_ = (n);					 \

     (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_,		 \

				    (unsigned long)_n_, sizeof(*(ptr))); \

  })



#include <asm-generic/cmpxchg-local.h>



static inline unsigned long __cmpxchg_local(volatile void *ptr,

				      unsigned long old,

				      unsigned long new_, int size)

{

	switch (size) {

#ifdef CONFIG_64BIT

	case 8:	return __cmpxchg_u64((unsigned long *)ptr, old, new_);

#endif

	case 4:	return __cmpxchg_u32(ptr, old, new_);

	default:

		return __cmpxchg_local_generic(ptr, old, new_, size);

	}

}



/*

 * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make

 * them available.

 */

#define cmpxchg_local(ptr, o, n)				  	\

	((__typeof__(*(ptr)))__cmpxchg_local((ptr), (unsigned long)(o),	\

			(unsigned long)(n), sizeof(*(ptr))))

#ifdef CONFIG_64BIT

#define cmpxchg64_local(ptr, o, n)					\

  ({									\

	BUILD_BUG_ON(sizeof(*(ptr)) != 8);				\

	cmpxchg_local((ptr), (o), (n));					\

  })

#else

#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))

#endif



/*

 * Note that we need not lock read accesses - aligned word writes/reads

 * are atomic, so a reader never sees inconsistent values.

arch/parisc/include/asm/cmpxchg.h

0 → 100644
+116 −0
Original line number Diff line number Diff line 
/*

 * forked from parisc asm/atomic.h which was:

 *	Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org>

 *	Copyright (C) 2006 Kyle McMartin <kyle@parisc-linux.org>

 */



#ifndef _ASM_PARISC_CMPXCHG_H_

#define _ASM_PARISC_CMPXCHG_H_



/* This should get optimized out since it's never called.

** Or get a link error if xchg is used "wrong".

*/

extern void __xchg_called_with_bad_pointer(void);



/* __xchg32/64 defined in arch/parisc/lib/bitops.c */

extern unsigned long __xchg8(char, char *);

extern unsigned long __xchg32(int, int *);

#ifdef CONFIG_64BIT

extern unsigned long __xchg64(unsigned long, unsigned long *);

#endif



/* optimizer better get rid of switch since size is a constant */

static inline unsigned long

__xchg(unsigned long x, __volatile__ void *ptr, int size)

{

	switch (size) {

#ifdef CONFIG_64BIT

	case 8: return __xchg64(x, (unsigned long *) ptr);

#endif

	case 4: return __xchg32((int) x, (int *) ptr);

	case 1: return __xchg8((char) x, (char *) ptr);

	}

	__xchg_called_with_bad_pointer();

	return x;

}



/*

** REVISIT - Abandoned use of LDCW in xchg() for now:

** o need to test sizeof(*ptr) to avoid clearing adjacent bytes

** o and while we are at it, could CONFIG_64BIT code use LDCD too?

**

**	if (__builtin_constant_p(x) && (x == NULL))

**		if (((unsigned long)p & 0xf) == 0)

**			return __ldcw(p);

*/

#define xchg(ptr, x) \

	((__typeof__(*(ptr)))__xchg((unsigned long)(x), (ptr), sizeof(*(ptr))))



#define __HAVE_ARCH_CMPXCHG	1



/* bug catcher for when unsupported size is used - won't link */

extern void __cmpxchg_called_with_bad_pointer(void);



/* __cmpxchg_u32/u64 defined in arch/parisc/lib/bitops.c */

extern unsigned long __cmpxchg_u32(volatile unsigned int *m, unsigned int old,

				   unsigned int new_);

extern unsigned long __cmpxchg_u64(volatile unsigned long *ptr,

				   unsigned long old, unsigned long new_);



/* don't worry...optimizer will get rid of most of this */

static inline unsigned long

__cmpxchg(volatile void *ptr, unsigned long old, unsigned long new_, int size)

{

	switch (size) {

#ifdef CONFIG_64BIT

	case 8: return __cmpxchg_u64((unsigned long *)ptr, old, new_);

#endif

	case 4: return __cmpxchg_u32((unsigned int *)ptr,

				     (unsigned int)old, (unsigned int)new_);

	}

	__cmpxchg_called_with_bad_pointer();

	return old;

}



#define cmpxchg(ptr, o, n)						 \

({									 \

	__typeof__(*(ptr)) _o_ = (o);					 \

	__typeof__(*(ptr)) _n_ = (n);					 \

	(__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_,	 \

				    (unsigned long)_n_, sizeof(*(ptr))); \

})



#include <asm-generic/cmpxchg-local.h>



static inline unsigned long __cmpxchg_local(volatile void *ptr,

				      unsigned long old,

				      unsigned long new_, int size)

{

	switch (size) {

#ifdef CONFIG_64BIT

	case 8:	return __cmpxchg_u64((unsigned long *)ptr, old, new_);

#endif

	case 4:	return __cmpxchg_u32(ptr, old, new_);

	default:

		return __cmpxchg_local_generic(ptr, old, new_, size);

	}

}



/*

 * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make

 * them available.

 */

#define cmpxchg_local(ptr, o, n)					\

	((__typeof__(*(ptr)))__cmpxchg_local((ptr), (unsigned long)(o),	\

			(unsigned long)(n), sizeof(*(ptr))))

#ifdef CONFIG_64BIT

#define cmpxchg64_local(ptr, o, n)					\

({									\

	BUILD_BUG_ON(sizeof(*(ptr)) != 8);				\

	cmpxchg_local((ptr), (o), (n));					\

})

#else

#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))

#endif



#endif /* _ASM_PARISC_CMPXCHG_H_ */

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