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atomic: move atomic_add_unless to generic code

Browse source 
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
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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