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[PATCH] atomic_long_t & include/asm-generic/atomic.h V2 

Several counters already have the need to use 64 atomic variables on 64 bit
platforms (see mm_counter_t in sched.h).  We have to do ugly ifdefs to fall
back to 32 bit atomic on 32 bit platforms.

The VM statistics patch that I am working on will also make more extensive
use of atomic64.

This patch introduces a new type atomic_long_t by providing definitions in
asm-generic/atomic.h that works similar to the c "long" type.  Its 32 bits
on 32 bit platforms and 64 bits on 64 bit platforms.

Also cleans up the determination of the mm_counter_t in sched.h.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Christoph Lameter 2006-01-06 00:11:20 -08:00 committed by Linus Torvalds
parent 070f80326a
commit d3cb487149
24 changed files with 144 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/asm-alpha/atomic.h
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@ -216,4 +216,5 @@ static __inline__ long atomic64_sub_return(long i, atomic64_t * v)
#define smp_mb__before_atomic_inc() smp_mb()
#define smp_mb__after_atomic_inc() smp_mb()
#include <asm-generic/atomic.h>
#endif /* _ALPHA_ATOMIC_H */

1
include/asm-arm/atomic.h
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@ -205,5 +205,6 @@ static inline int atomic_add_unless(atomic_t *v, int a, int u)
#define smp_mb__before_atomic_inc() barrier()
#define smp_mb__after_atomic_inc() barrier()
#include <asm-generic/atomic.h>
#endif
#endif

1
include/asm-arm26/atomic.h
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@ -118,5 +118,6 @@ static inline void atomic_clear_mask(unsigned long mask, unsigned long *addr)
#define smp_mb__before_atomic_inc() barrier()
#define smp_mb__after_atomic_inc() barrier()
#include <asm-generic/atomic.h>
#endif
#endif

1
include/asm-cris/atomic.h
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@ -156,4 +156,5 @@ static inline int atomic_add_unless(atomic_t *v, int a, int u)
#define smp_mb__before_atomic_inc() barrier()
#define smp_mb__after_atomic_inc() barrier()
#include <asm-generic/atomic.h>
#endif

1
include/asm-frv/atomic.h
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@ -426,4 +426,5 @@ extern uint32_t __cmpxchg_32(uint32_t *v, uint32_t test, uint32_t new);
})
#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
#include <asm-generic/atomic.h>
#endif /* _ASM_ATOMIC_H */

116
include/asm-generic/atomic.h Normal file
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@ -0,0 +1,116 @@
#ifndef _ASM_GENERIC_ATOMIC_H
#define _ASM_GENERIC_ATOMIC_H
/*
* Copyright (C) 2005 Silicon Graphics, Inc.
* Christoph Lameter <clameter@sgi.com>
*
* Allows to provide arch independent atomic definitions without the need to
* edit all arch specific atomic.h files.
*/
/*
* Suppport for atomic_long_t
*
* Casts for parameters are avoided for existing atomic functions in order to
* avoid issues with cast-as-lval under gcc 4.x and other limitations that the
* macros of a platform may have.
*/
#if BITS_PER_LONG == 64
typedef atomic64_t atomic_long_t;
#define ATOMIC_LONG_INIT(i) ATOMIC64_INIT(i)
static inline long atomic_long_read(atomic_long_t *l)
{
atomic64_t *v = (atomic64_t *)l;
return (long)atomic64_read(v);
}
static inline void atomic_long_set(atomic_long_t *l, long i)
{
atomic64_t *v = (atomic64_t *)l;
atomic_set(v, i);
}
static inline void atomic_long_inc(atomic_long_t *l)
{
atomic64_t *v = (atomic64_t *)l;
atomic64_inc(v);
}
static inline void atomic_long_dec(atomic_long_t *l)
{
atomic64_t *v = (atomic64_t *)l;
atomic64_dec(v);
}
static inline void atomic_long_add(long i, atomic_long_t *l)
{
atomic64_t *v = (atomic64_t *)l;
atomic64_add(i, v);
}
static inline void atomic_long_sub(long i, atomic_long_t *l)
{
atomic64_t *v = (atomic64_t *)l;
atomic64_sub(i, v);
}
#else
typedef atomic_t atomic_long_t;
#define ATOMIC_LONG_INIT(i) ATOMIC_INIT(i)
static inline long atomic_long_read(atomic_long_t *l)
{
atomic_t *v = (atomic_t *)l;
return (long)atomic_read(v);
}
static inline void atomic_long_set(atomic_long_t *l, long i)
{
atomic_t *v = (atomic_t *)l;
atomic_set(v, i);
}
static inline void atomic_long_inc(atomic_long_t *l)
{
atomic_t *v = (atomic_t *)l;
atomic_inc(v);
}
static inline void atomic_long_dec(atomic_long_t *l)
{
atomic_t *v = (atomic_t *)l;
atomic_dec(v);
}
static inline void atomic_long_add(long i, atomic_long_t *l)
{
atomic_t *v = (atomic_t *)l;
atomic_add(i, v);
}
static inline void atomic_long_sub(long i, atomic_long_t *l)
{
atomic_t *v = (atomic_t *)l;
atomic_sub(i, v);
}
#endif
#endif

1
include/asm-h8300/atomic.h
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@ -137,4 +137,5 @@ static __inline__ void atomic_set_mask(unsigned long mask, unsigned long *v)
#define smp_mb__before_atomic_inc() barrier()
#define smp_mb__after_atomic_inc() barrier()
#include <asm-generic/atomic.h>
#endif /* __ARCH_H8300_ATOMIC __ */

1
include/asm-i386/atomic.h
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@ -254,4 +254,5 @@ __asm__ __volatile__(LOCK "orl %0,%1" \
#define smp_mb__before_atomic_inc() barrier()
#define smp_mb__after_atomic_inc() barrier()
#include <asm-generic/atomic.h>
#endif

1
include/asm-ia64/atomic.h
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@ -192,4 +192,5 @@ atomic64_add_negative (__s64 i, atomic64_t *v)
#define smp_mb__before_atomic_inc() barrier()
#define smp_mb__after_atomic_inc() barrier()
#include <asm-generic/atomic.h>
#endif /* _ASM_IA64_ATOMIC_H */

1
include/asm-m32r/atomic.h
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@ -313,4 +313,5 @@ static __inline__ void atomic_set_mask(unsigned long mask, atomic_t *addr)
#define smp_mb__before_atomic_inc() barrier()
#define smp_mb__after_atomic_inc() barrier()
#include <asm-generic/atomic.h>
#endif /* _ASM_M32R_ATOMIC_H */

1
include/asm-m68k/atomic.h
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@ -157,4 +157,5 @@ static inline void atomic_set_mask(unsigned long mask, unsigned long *v)
#define smp_mb__before_atomic_inc() barrier()
#define smp_mb__after_atomic_inc() barrier()
#include <asm-generic/atomic.h>
#endif /* __ARCH_M68K_ATOMIC __ */

1
include/asm-m68knommu/atomic.h
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@ -143,4 +143,5 @@ static inline int atomic_sub_return(int i, atomic_t * v)
#define atomic_dec_return(v) atomic_sub_return(1,(v))
#define atomic_inc_return(v) atomic_add_return(1,(v))
#include <asm-generic/atomic.h>
#endif /* __ARCH_M68KNOMMU_ATOMIC __ */

1
include/asm-mips/atomic.h
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@ -713,4 +713,5 @@ static __inline__ long atomic64_sub_if_positive(long i, atomic64_t * v)
#define smp_mb__before_atomic_inc() smp_mb()
#define smp_mb__after_atomic_inc() smp_mb()
#include <asm-generic/atomic.h>
#endif /* _ASM_ATOMIC_H */

1
include/asm-parisc/atomic.h
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@ -216,4 +216,5 @@ static __inline__ int atomic_read(const atomic_t *v)
#define smp_mb__before_atomic_inc() smp_mb()
#define smp_mb__after_atomic_inc() smp_mb()
#include <asm-generic/atomic.h>
#endif

1
include/asm-powerpc/atomic.h
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@ -402,5 +402,6 @@ static __inline__ long atomic64_dec_if_positive(atomic64_t *v)
#endif /* __powerpc64__ */
#include <asm-generic/atomic.h>
#endif /* __KERNEL__ */
#endif /* _ASM_POWERPC_ATOMIC_H_ */

1
include/asm-s390/atomic.h
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@ -215,5 +215,6 @@ atomic_compare_and_swap(int expected_oldval,int new_val,atomic_t *v)
#define smp_mb__before_atomic_inc() smp_mb()
#define smp_mb__after_atomic_inc() smp_mb()
#include <asm-generic/atomic.h>
#endif /* __KERNEL__ */
#endif /* __ARCH_S390_ATOMIC__ */

1
include/asm-sh/atomic.h
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@ -140,4 +140,5 @@ static __inline__ void atomic_set_mask(unsigned int mask, atomic_t *v)
#define smp_mb__before_atomic_inc() barrier()
#define smp_mb__after_atomic_inc() barrier()
#include <asm-generic/atomic.h>
#endif /* __ASM_SH_ATOMIC_H */

1
include/asm-sh64/atomic.h
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@ -152,4 +152,5 @@ static __inline__ void atomic_set_mask(unsigned int mask, atomic_t *v)
#define smp_mb__before_atomic_inc() barrier()
#define smp_mb__after_atomic_inc() barrier()
#include <asm-generic/atomic.h>
#endif /* __ASM_SH64_ATOMIC_H */

1
include/asm-sparc/atomic.h
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@ -159,4 +159,5 @@ static inline int __atomic24_sub(int i, atomic24_t *v)
#endif /* !(__KERNEL__) */
#include <asm-generic/atomic.h>
#endif /* !(__ARCH_SPARC_ATOMIC__) */

1
include/asm-sparc64/atomic.h
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@ -96,4 +96,5 @@ extern int atomic64_sub_ret(int, atomic64_t *);
#define smp_mb__after_atomic_inc() barrier()
#endif
#include <asm-generic/atomic.h>
#endif /* !(__ARCH_SPARC64_ATOMIC__) */

1
include/asm-v850/atomic.h
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@ -126,4 +126,5 @@ static inline int atomic_add_unless(atomic_t *v, int a, int u)
#define smp_mb__before_atomic_inc() barrier()
#define smp_mb__after_atomic_inc() barrier()
#include <asm-generic/atomic.h>
#endif /* __V850_ATOMIC_H__ */

1
include/asm-x86_64/atomic.h
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@ -424,4 +424,5 @@ __asm__ __volatile__(LOCK "orl %0,%1" \
#define smp_mb__before_atomic_inc() barrier()
#define smp_mb__after_atomic_inc() barrier()
#include <asm-generic/atomic.h>
#endif

1
include/asm-xtensa/atomic.h
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@ -286,6 +286,7 @@ static inline void atomic_set_mask(unsigned int mask, atomic_t *v)
#define smp_mb__before_atomic_inc() barrier()
#define smp_mb__after_atomic_inc() barrier()
#include <asm-generic/atomic.h>
#endif /* __KERNEL__ */
#endif /* _XTENSA_ATOMIC_H */

25
include/linux/sched.h
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@ -254,25 +254,12 @@ extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
* The mm counters are not protected by its page_table_lock,
* so must be incremented atomically.
*/
#ifdef ATOMIC64_INIT
#define set_mm_counter(mm, member, value) atomic64_set(&(mm)->_##member, value)
#define get_mm_counter(mm, member) ((unsigned long)atomic64_read(&(mm)->_##member))
#define add_mm_counter(mm, member, value) atomic64_add(value, &(mm)->_##member)
#define inc_mm_counter(mm, member) atomic64_inc(&(mm)->_##member)
#define dec_mm_counter(mm, member) atomic64_dec(&(mm)->_##member)
typedef atomic64_t mm_counter_t;
#else /* !ATOMIC64_INIT */
/*
* The counters wrap back to 0 at 2^32 * PAGE_SIZE,
* that is, at 16TB if using 4kB page size.
*/
#define set_mm_counter(mm, member, value) atomic_set(&(mm)->_##member, value)
#define get_mm_counter(mm, member) ((unsigned long)atomic_read(&(mm)->_##member))
#define add_mm_counter(mm, member, value) atomic_add(value, &(mm)->_##member)
#define inc_mm_counter(mm, member) atomic_inc(&(mm)->_##member)
#define dec_mm_counter(mm, member) atomic_dec(&(mm)->_##member)
typedef atomic_t mm_counter_t;
#endif /* !ATOMIC64_INIT */
#define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value)
#define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member))
#define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member)
#define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member)
#define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member)
typedef atomic_long_t mm_counter_t;
#else /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
/*