OpenE2K
/
linux
6
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

atomic: move atomic_add_unless to generic code 

This is in preparation for more generic atomic primitives based on
__atomic_add_unless.

Signed-off-by: Arun Sharma <asharma@fb.com>
Signed-off-by: Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com>
Reviewed-by: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: David Miller <davem@davemloft.net>
Acked-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Arun Sharma 2011-07-26 16:09:07 -07:00 committed by Linus Torvalds
parent 60063497a9
commit f24219b4e9
26 changed files with 109 additions and 102 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
arch/alpha/include/asm/atomic.h
View File

@ -176,15 +176,15 @@ static __inline__ long atomic64_sub_return(long i, atomic64_t * v)
#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
/**
* atomic_add_unless - add unless the number is a given value
* __atomic_add_unless - add unless the number is 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.
* Returns non-zero if @v was not @u, and zero otherwise.
* Returns the old value of @v.
*/
static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
static __inline__ int __atomic_add_unless(atomic_t *v, int a, int u)
{
int c, old;
c = atomic_read(v);
@ -196,7 +196,7 @@ static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
break;
c = old;
}
return c != (u);
return c;
}
@ -207,7 +207,7 @@ static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
* @u: ...unless v is equal to u.
*
* Atomically adds @a to @v, so long as it was not @u.
* Returns non-zero if @v was not @u, and zero otherwise.
* Returns the old value of @v.
*/
static __inline__ int atomic64_add_unless(atomic64_t *v, long a, long u)
{

4
arch/arm/include/asm/atomic.h
View File

@ -208,14 +208,14 @@ static inline void atomic_clear_mask(unsigned long mask, unsigned long *addr)
#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
static inline int atomic_add_unless(atomic_t *v, int a, int u)
static inline int __atomic_add_unless(atomic_t *v, int a, int u)
{
int c, old;
c = atomic_read(v);
while (c != u && (old = atomic_cmpxchg((v), c, c + a)) != c)
c = old;
return c != u;
return c;
}
#define atomic_inc(v) atomic_add(1, v)

57
arch/avr32/include/asm/atomic.h
View File

@ -78,70 +78,63 @@ static inline int atomic_add_return(int i, atomic_t *v)
/*
* atomic_sub_unless - sub unless the number is a given value
* @v: pointer of type atomic_t
* @a: the amount to add to v...
* @a: the amount to subtract from v...
* @u: ...unless v is equal to u.
*
* If the atomic value v is not equal to u, this function subtracts a
* from v, and returns non zero. If v is equal to u then it returns
* zero. This is done as an atomic operation.
* Atomically subtract @a from @v, so long as it was not @u.
* Returns the old value of @v.
*/
static inline int atomic_sub_unless(atomic_t *v, int a, int u)
static inline void atomic_sub_unless(atomic_t *v, int a, int u)
{
int tmp, result = 0;
int tmp;
asm volatile(
"/* atomic_sub_unless */\n"
"1: ssrf 5\n"
" ld.w %0, %3\n"
" cp.w %0, %5\n"
" ld.w %0, %2\n"
" cp.w %0, %4\n"
" breq 1f\n"
" sub %0, %4\n"
" stcond %2, %0\n"
" sub %0, %3\n"
" stcond %1, %0\n"
" brne 1b\n"
" mov %1, 1\n"
"1:"
: "=&r"(tmp), "=&r"(result), "=o"(v->counter)
: "m"(v->counter), "rKs21"(a), "rKs21"(u), "1"(result)
: "=&r"(tmp), "=o"(v->counter)
: "m"(v->counter), "rKs21"(a), "rKs21"(u)
: "cc", "memory");
return result;
}
/*
* atomic_add_unless - add unless the number is a given value
* __atomic_add_unless - add unless the number is a given value
* @v: pointer of type atomic_t
* @a: the amount to add to v...
* @u: ...unless v is equal to u.
*
* If the atomic value v is not equal to u, this function adds a to v,
* and returns non zero. If v is equal to u then it returns zero. This
* is done as an atomic operation.
* Atomically adds @a to @v, so long as it was not @u.
* Returns the old value of @v.
*/
static inline int atomic_add_unless(atomic_t *v, int a, int u)
static inline int __atomic_add_unless(atomic_t *v, int a, int u)
{
int tmp, result;
int tmp, old = atomic_read(v);
if (__builtin_constant_p(a) && (a >= -1048575) && (a <= 1048576))
result = atomic_sub_unless(v, -a, u);
atomic_sub_unless(v, -a, u);
else {
result = 0;
asm volatile(
"/* atomic_add_unless */\n"
"/* __atomic_add_unless */\n"
"1: ssrf 5\n"
" ld.w %0, %3\n"
" cp.w %0, %5\n"
" ld.w %0, %2\n"
" cp.w %0, %4\n"
" breq 1f\n"
" add %0, %4\n"
" stcond %2, %0\n"
" add %0, %3\n"
" stcond %1, %0\n"
" brne 1b\n"
" mov %1, 1\n"
"1:"
: "=&r"(tmp), "=&r"(result), "=o"(v->counter)
: "m"(v->counter), "r"(a), "ir"(u), "1"(result)
: "=&r"(tmp), "=o"(v->counter)
: "m"(v->counter), "r"(a), "ir"(u)
: "cc", "memory");
}
return result;
return old;
}
/*

4
arch/blackfin/include/asm/atomic.h
View File

@ -89,13 +89,13 @@ static inline void atomic_set_mask(int mask, atomic_t *v)
#define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n)))
#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
#define atomic_add_unless(v, a, u) \
#define __atomic_add_unless(v, a, u) \
({ \
int c, old; \
c = atomic_read(v); \
while (c != (u) && (old = atomic_cmpxchg((v), c, c + (a))) != c) \
c = old; \
c != (u); \
c; \
})
/*

4
arch/cris/include/asm/atomic.h
View File

@ -138,7 +138,7 @@ static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
static inline int atomic_add_unless(atomic_t *v, int a, int u)
static inline int __atomic_add_unless(atomic_t *v, int a, int u)
{
int ret;
unsigned long flags;
@ -148,7 +148,7 @@ static inline int atomic_add_unless(atomic_t *v, int a, int u)
if (ret != u)
v->counter += a;
cris_atomic_restore(v, flags);
return ret != u;
return ret;
}
/* Atomic operations are already serializing */

4
arch/frv/include/asm/atomic.h
View File

@ -241,7 +241,7 @@ extern uint32_t __xchg_32(uint32_t i, volatile void *v);
#define atomic64_cmpxchg(v, old, new) (__cmpxchg_64(old, new, &(v)->counter))
#define atomic64_xchg(v, new) (__xchg_64(new, &(v)->counter))
static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
static __inline__ int __atomic_add_unless(atomic_t *v, int a, int u)
{
int c, old;
c = atomic_read(v);
@ -253,7 +253,7 @@ static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
break;
c = old;
}
return c != (u);
return c;
}

4
arch/h8300/include/asm/atomic.h
View File

@ -104,7 +104,7 @@ static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
static inline int atomic_add_unless(atomic_t *v, int a, int u)
static inline int __atomic_add_unless(atomic_t *v, int a, int u)
{
int ret;
unsigned long flags;
@ -114,7 +114,7 @@ static inline int atomic_add_unless(atomic_t *v, int a, int u)
if (ret != u)
v->counter += a;
local_irq_restore(flags);
return ret != u;
return ret;
}
static __inline__ void atomic_clear_mask(unsigned long mask, unsigned long *v)

4
arch/ia64/include/asm/atomic.h
View File

@ -90,7 +90,7 @@ ia64_atomic64_sub (__s64 i, atomic64_t *v)
(cmpxchg(&((v)->counter), old, new))
#define atomic64_xchg(v, new) (xchg(&((v)->counter), new))
static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
static __inline__ int __atomic_add_unless(atomic_t *v, int a, int u)
{
int c, old;
c = atomic_read(v);
@ -102,7 +102,7 @@ static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
break;
c = old;
}
return c != (u);
return c;
}

8
arch/m32r/include/asm/atomic.h
View File

@ -239,15 +239,15 @@ static __inline__ int atomic_dec_return(atomic_t *v)
#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
/**
* atomic_add_unless - add unless the number is a given value
* __atomic_add_unless - add unless the number is 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.
* Returns non-zero if @v was not @u, and zero otherwise.
* Returns the old value of @v.
*/
static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
static __inline__ int __atomic_add_unless(atomic_t *v, int a, int u)
{
int c, old;
c = atomic_read(v);
@ -259,7 +259,7 @@ static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
break;
c = old;
}
return c != (u);
return c;
}

4
arch/m68k/include/asm/atomic.h
View File

@ -183,7 +183,7 @@ static inline void atomic_set_mask(unsigned long mask, unsigned long *v)
__asm__ __volatile__("orl %1,%0" : "+m" (*v) : ASM_DI (mask));
}
static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
static __inline__ int __atomic_add_unless(atomic_t *v, int a, int u)
{
int c, old;
c = atomic_read(v);
@ -195,7 +195,7 @@ static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
break;
c = old;
}
return c != (u);
return c;
}

10
arch/mips/include/asm/atomic.h
View File

@ -303,15 +303,15 @@ static __inline__ int atomic_sub_if_positive(int i, atomic_t * v)
#define atomic_xchg(v, new) (xchg(&((v)->counter), (new)))
/**
* atomic_add_unless - add unless the number is a given value
* __atomic_add_unless - add unless the number is 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.
* Returns non-zero if @v was not @u, and zero otherwise.
* Returns the old value of @v.
*/
static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
static __inline__ int __atomic_add_unless(atomic_t *v, int a, int u)
{
int c, old;
c = atomic_read(v);
@ -323,7 +323,7 @@ static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
break;
c = old;
}
return c != (u);
return c;
}
#define atomic_dec_return(v) atomic_sub_return(1, (v))
@ -679,7 +679,7 @@ static __inline__ long atomic64_sub_if_positive(long i, atomic64_t * v)
* @u: ...unless v is equal to u.
*
* Atomically adds @a to @v, so long as it was not @u.
* Returns non-zero if @v was not @u, and zero otherwise.
* Returns the old value of @v.
*/
static __inline__ int atomic64_add_unless(atomic64_t *v, long a, long u)
{

4
arch/mn10300/include/asm/atomic.h
View File

@ -260,13 +260,13 @@ static inline void atomic_dec(atomic_t *v)
#define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0)
#define atomic_inc_and_test(v) (atomic_add_return(1, (v)) == 0)
#define atomic_add_unless(v, a, u) \
#define __atomic_add_unless(v, a, u) \
({ \
int c, old; \
c = atomic_read(v); \
while (c != (u) && (old = atomic_cmpxchg((v), c, c + (a))) != c) \
c = old; \
c != (u); \
c; \
})

10
arch/parisc/include/asm/atomic.h
View File

@ -197,15 +197,15 @@ static __inline__ int atomic_read(const atomic_t *v)
#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
/**
* atomic_add_unless - add unless the number is a given value
* __atomic_add_unless - add unless the number is 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.
* Returns non-zero if @v was not @u, and zero otherwise.
* Returns the old value of @v.
*/
static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
static __inline__ int __atomic_add_unless(atomic_t *v, int a, int u)
{
int c, old;
c = atomic_read(v);
@ -217,7 +217,7 @@ static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
break;
c = old;
}
return c != (u);
return c;
}
@ -316,7 +316,7 @@ atomic64_read(const atomic64_t *v)
* @u: ...unless v is equal to u.
*
* Atomically adds @a to @v, so long as it was not @u.
* Returns non-zero if @v was not @u, and zero otherwise.
* Returns the old value of @v.
*/
static __inline__ int atomic64_add_unless(atomic64_t *v, long a, long u)
{

14
arch/powerpc/include/asm/atomic.h
View File

@ -181,21 +181,21 @@ static __inline__ int atomic_dec_return(atomic_t *v)
#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
/**
* atomic_add_unless - add unless the number is a given value
* __atomic_add_unless - add unless the number is 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.
* Returns non-zero if @v was not @u, and zero otherwise.
* Returns the old value of @v.
*/
static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
static __inline__ int __atomic_add_unless(atomic_t *v, int a, int u)
{
int t;
__asm__ __volatile__ (
PPC_RELEASE_BARRIER
"1: lwarx %0,0,%1 # atomic_add_unless\n\
"1: lwarx %0,0,%1 # __atomic_add_unless\n\
cmpw 0,%0,%3 \n\
beq- 2f \n\
add %0,%2,%0 \n"
@ -209,7 +209,7 @@ static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
: "r" (&v->counter), "r" (a), "r" (u)
: "cc", "memory");
return t != u;
return t;
}
@ -443,7 +443,7 @@ static __inline__ long atomic64_dec_if_positive(atomic64_t *v)
* @u: ...unless v is equal to u.
*
* Atomically adds @a to @v, so long as it was not @u.
* Returns non-zero if @v was not @u, and zero otherwise.
* Returns the old value of @v.
*/
static __inline__ int atomic64_add_unless(atomic64_t *v, long a, long u)
{
@ -451,7 +451,7 @@ static __inline__ int atomic64_add_unless(atomic64_t *v, long a, long u)
__asm__ __volatile__ (
PPC_RELEASE_BARRIER
"1: ldarx %0,0,%1 # atomic_add_unless\n\
"1: ldarx %0,0,%1 # __atomic_add_unless\n\
cmpd 0,%0,%3 \n\
beq- 2f \n\
add %0,%2,%0 \n"

4
arch/s390/include/asm/atomic.h
View File

@ -93,7 +93,7 @@ static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
return old;
}
static inline int atomic_add_unless(atomic_t *v, int a, int u)
static inline int __atomic_add_unless(atomic_t *v, int a, int u)
{
int c, old;
c = atomic_read(v);
@ -105,7 +105,7 @@ static inline int atomic_add_unless(atomic_t *v, int a, int u)
break;
c = old;
}
return c != u;
return c;
}

8
arch/sh/include/asm/atomic.h
View File

@ -38,15 +38,15 @@
#define atomic_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n)))
/**
* atomic_add_unless - add unless the number is a given value
* __atomic_add_unless - add unless the number is 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.
* Returns non-zero if @v was not @u, and zero otherwise.
* Returns the old value of @v.
*/
static inline int atomic_add_unless(atomic_t *v, int a, int u)
static inline int __atomic_add_unless(atomic_t *v, int a, int u)
{
int c, old;
c = atomic_read(v);
@ -59,7 +59,7 @@ static inline int atomic_add_unless(atomic_t *v, int a, int u)
c = old;
}
return c != (u);
return c;
}
#define smp_mb__before_atomic_dec() smp_mb()

2
arch/sparc/include/asm/atomic_32.h
View File

@ -22,7 +22,7 @@
extern int __atomic_add_return(int, atomic_t *);
extern int atomic_cmpxchg(atomic_t *, int, int);
#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
extern int atomic_add_unless(atomic_t *, int, int);
extern int __atomic_add_unless(atomic_t *, int, int);
extern void atomic_set(atomic_t *, int);
#define atomic_read(v) (*(volatile int *)&(v)->counter)

4
arch/sparc/include/asm/atomic_64.h
View File

@ -70,7 +70,7 @@ extern long atomic64_sub_ret(long, atomic64_t *);
#define atomic_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n)))
#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
static inline int atomic_add_unless(atomic_t *v, int a, int u)
static inline int __atomic_add_unless(atomic_t *v, int a, int u)
{
int c, old;
c = atomic_read(v);
@ -82,7 +82,7 @@ static inline int atomic_add_unless(atomic_t *v, int a, int u)
break;
c = old;
}
return c != (u);
return c;
}

10
arch/tile/include/asm/atomic_32.h
View File

@ -81,18 +81,18 @@ static inline int atomic_add_return(int i, atomic_t *v)
}
/**
* atomic_add_unless - add unless the number is already 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 @v was not already @u.
* Returns non-zero if @v was not @u, and zero otherwise.
* Returns the old value of @v.
*/
static inline int atomic_add_unless(atomic_t *v, int a, int u)
static inline int __atomic_add_unless(atomic_t *v, int a, int u)
{
smp_mb(); /* barrier for proper semantics */
return _atomic_xchg_add_unless(v, a, u) != u;
return _atomic_xchg_add_unless(v, a, u);
}
/**
@ -199,7 +199,7 @@ static inline u64 atomic64_add_return(u64 i, atomic64_t *v)
* @u: ...unless v is equal to 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.
* Returns the old value of @v.
*/
static inline u64 atomic64_add_unless(atomic64_t *v, u64 a, u64 u)
{

4
arch/tile/include/asm/atomic_64.h
View File

@ -64,7 +64,7 @@ static inline int atomic_add_return(int i, atomic_t *v)
return val;
}
static inline int atomic_add_unless(atomic_t *v, int a, int u)
static inline int __atomic_add_unless(atomic_t *v, int a, int u)
{
int guess, oldval = v->counter;
do {
@ -73,7 +73,7 @@ static inline int atomic_add_unless(atomic_t *v, int a, int u)
guess = oldval;
oldval = atomic_cmpxchg(v, guess, guess + a);
} while (guess != oldval);
return oldval != u;
return oldval;
}
/* Now the true 64-bit operations. */

8
arch/x86/include/asm/atomic.h
View File

@ -221,15 +221,15 @@ static inline int atomic_xchg(atomic_t *v, int new)
}
/**
* atomic_add_unless - add unless the number is already 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 @v was not already @u.
* Returns non-zero if @v was not @u, and zero otherwise.
* Returns the old value of @v.
*/
static inline int atomic_add_unless(atomic_t *v, int a, int u)
static inline int __atomic_add_unless(atomic_t *v, int a, int u)
{
int c, old;
c = atomic_read(v);
@ -241,7 +241,7 @@ static inline int atomic_add_unless(atomic_t *v, int a, int u)
break;
c = old;
}
return c != (u);
return c;
}

2
arch/x86/include/asm/atomic64_32.h
View File

@ -263,7 +263,7 @@ static inline int atomic64_add_negative(long long i, atomic64_t *v)
* @u: ...unless v is equal to u.
*
* Atomically adds @a to @v, so long as it was not @u.
* Returns non-zero if @v was not @u, and zero otherwise.
* Returns the old value of @v.
*/
static inline int atomic64_add_unless(atomic64_t *v, long long a, long long u)
{

2
arch/x86/include/asm/atomic64_64.h
View File

@ -202,7 +202,7 @@ static inline long atomic64_xchg(atomic64_t *v, long new)
* @u: ...unless v is equal to u.
*
* Atomically adds @a to @v, so long as it was not @u.
* Returns non-zero if @v was not @u, and zero otherwise.
* Returns the old value of @v.
*/
static inline int atomic64_add_unless(atomic64_t *v, long a, long u)
{

8
arch/xtensa/include/asm/atomic.h
View File

@ -225,15 +225,15 @@ static inline int atomic_sub_return(int i, atomic_t * v)
#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
/**
* atomic_add_unless - add unless the number is a given value
* __atomic_add_unless - add unless the number is 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.
* Returns non-zero if @v was not @u, and zero otherwise.
* Returns the old value of @v.
*/
static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
static __inline__ int __atomic_add_unless(atomic_t *v, int a, int u)
{
int c, old;
c = atomic_read(v);
@ -245,7 +245,7 @@ static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
break;
c = old;
}
return c != (u);
return c;
}

4
include/asm-generic/atomic.h
View File

@ -129,13 +129,13 @@ static inline void atomic_dec(atomic_t *v)
#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
static inline int atomic_add_unless(atomic_t *v, int a, int u)
static inline int __atomic_add_unless(atomic_t *v, int a, int u)
{
int c, old;
c = atomic_read(v);
while (c != u && (old = atomic_cmpxchg(v, c, c + a)) != c)
c = old;
return c != u;
return c;
}
static inline void atomic_clear_mask(unsigned long mask, unsigned long *addr)

14
include/linux/atomic.h
View File

@ -2,6 +2,20 @@
#define _LINUX_ATOMIC_H
#include <asm/atomic.h>
/**
* 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 @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)
{
return __atomic_add_unless(v, a, u) != u;
}
/**
* atomic_inc_not_zero - increment unless the number is zero
* @v: pointer of type atomic_t